1. An immovable double-telecentric zoom scanning imaging system and a main structure parameter determination method are characterized in that:

the fixed double-telecentric zoom scanning imaging system consists of a laser modulation light source system, a fixed double-telecentric zoom scanning illumination system and a single-photon imaging system, and can realize active illumination modulation light beams with high uniformity and parallelism, rapid and accurate real-time zoom scaling and scanning of the active illumination light beams, and ghost imaging calculation by combining space-frequency multiplexing and heterogeneous multi-viewpoint channels;

the method for determining the main structure parameters of the immovable double-telecentric zoom scanning imaging system comprises the following steps:

s1: adopting a Gaussian bracket method to analyze the Gaussian solution characteristics of the system, and extracting zoom evaluation parameters capable of evaluating the zoom scaling capability of the motionless double-telecentric zoom scanning imaging system;

s2: according to a vector aberration theory, a Seidel aberration coefficient and a Snell's law, significant parameters and relevant mathematical models thereof which restrict the scanning performance of the stationary double-telecentric zoom scanning imaging system are provided, and then scanning evaluation parameters are extracted for evaluating the high-precision scanning capability of the system;

s3: and establishing a nonlinear global evaluation function by combining the zoom evaluation parameters and the scanning evaluation parameters, and performing optimal solution retrieval on the nonlinear global evaluation function to obtain the main structure of the immovable double-telecentric zoom scanning imaging system with good zoom scaling capability and high-precision scanning capability.

2. The motionless double telecentric zoom scanning imaging system according to claim 1, wherein:

the laser modulation light source system adopts a micromirror array spatial light modulator to modulate a laser light source, so that a light intensity modulated parallel light beam can be obtained;

the fixed double-telecentric zoom scanning illumination system adopts a double-telecentric optical system structure of an MOEMS device, is matched with a parallel light source, and can realize long-distance accurate uniform irradiation and real-time zooming and scanning functions;

the single photon imaging system collects diffuse reflection information generated by the modulated light beam illuminating the target.

3. The method for determining parameters of a main structure of an immobile double telecentric zoom scanning imaging system according to the claim 1, wherein the gaussian bracket method is adopted in the step S1 to analyze the gaussian characteristics of the main structure of the immobile double telecentric zoom scanning imaging system: the system main structure consists of n optical elements, wherein the mth and nth optical elements are MOEMS devices, and the 1 st to mth optical elements are equivalently regarded as one optical power phi₁Optical component of1, regarding the m +1 th to n-th optical elements as an equivalent of an optical power of phi₂The optical component 2 can be analyzed by a gauss bracket method to obtain the equivalent focal power phi of the immobile double telecentric zoom scanning imaging system_systemComprises the following steps:

wherein the content of the first and second substances,¹C_nis a constant of Gauss, phi_i(i 1,2, …, n) is the focal power of the different optical elements of the optical system, e_i' (i-1, 2, …, n-1) is the equivalent separation between optical element i and optical element i +1 of the optical system.

4. The method for determining the main structure parameters of the stationary double telecentric zoom scanning imaging system according to the claim 1, wherein the zoom evaluation parameters in the step S1 are the error terms of the zoom scaling characteristics of the stationary double telecentric zoom scanning imaging system.

5. The method for determining the main structural parameters of the stationary double telecentric zoom scanning imaging system according to claim 4, wherein the error term A of the zoom scaling characteristics of the stationary double telecentric zoom scanning imaging system_zoomComprises the following steps:

wherein, beta_minAnd beta_maxRespectively represent the minimum zoom magnification and the maximum zoom magnification, S'_F1Denotes the back focal length, S, of the optical component 1_F2The front focal length of the optical component 2 is indicated,andrespectively representing the minimum and maximum optical power of the MOEMS device 1,andthe minimum and maximum powers of the MOEMS device 2 are indicated, respectively.

6. The method for determining main structure parameters of an immobile double telecentric zoom scanning imaging system according to the claim 1, wherein the scanning evaluation parameters for evaluating the high-precision scanning capability of the immobile double telecentric zoom scanning imaging system in the step S2 comprise the optical power, the initial distortion and the error term of the central angle of the scanning beam of the immobile double telecentric zoom scanning imaging system.

7. The method for determining the main structural parameters of the stationary double telecentric zoom scanning imaging system according to claim 6, wherein the error term A of the optical power of the stationary double telecentric zoom scanning imaging system_focComprises the following steps:

A_foc＝|¹C_n|

wherein the content of the first and second substances,¹C_nis a constant gaussian; further, the air conditioner is provided with a fan,¹C_n＝[φ₁,-e′₁,…,φ_m,-e′_m,…,φ_n]＝[Φ₁,-e′_m,Φ₂]。

8. the method for determining the main structural parameters of the passive double telecentric zoom scanning imaging system according to claim 6, wherein the error term A of the primary distortion of the passive double telecentric zoom scanning imaging system is based on the vector aberration theory_abeComprises the following steps:

wherein the main structure of the immobile double telecentric zoom scanning imaging system comprises n optical elements,A_j＝(u'_j-u_j)/(1/n_j+1-1/n_j)；u_jand u'_jRespectively representing the edge ray incidence and exit angles, n, of the j-th optical element_jDenotes the refractive index after the jth optical element, h_jIndicating the marginal ray height of the jth optical element,represents the central ray height of the jth optical element,andrespectively representing the central ray incidence and exit angles of the jth optical element, c_jThe curvature of the vertex, k, of the surface shape of the jth optical element_jThe conic constant representing the face shape of the jth optical element,the equivalent field of view for the jth optical element.

9. The method for determining the main structural parameters of the stationary double telecentric zoom scanning imaging system according to the claim 6, wherein the error term A of the central angle of the scanning beam of the stationary double telecentric zoom scanning imaging system_cenComprises the following steps:

wherein, theta_xAnd theta_yRespectively representing the central angle of the actual outgoing beam of the system design,andthe central angles of the system exit beams required by the system design are respectively indicated.

10. The method for determining the main structural parameters of the stationary double-telecentric zoom scanning imaging system according to claim 1, wherein the non-linear global evaluation function established in step S3 can comprehensively evaluate the zoom scaling capability and the high-precision scanning capability of the stationary double-telecentric zoom scanning imaging system, and the non-linear global evaluation function is specifically as follows:

wherein the superscript l represents the l-th sampling focal point of the zoom system, M represents the number of sampling focal points, e_jDenotes the equivalent spacing, α, between the j-th and j + 1-th optical elements_jThe tilt angle of the j-th optical element profile, c_i、c_mAnd c_nRespectively represent the apex curvatures, k, of the ith, mth and nth optical element profiles_i、k_mAnd k_nParameters of quadric surfaces respectively representing the surface shapes of the ith, mth and nth optical elements, v_i(i ═ 1,2,3) represents the weight of the corresponding term; | | non-woven hair₁Representing a1 norm.

Further, in step S3, a global optimization algorithm is used to perform global optimal solution retrieval on the nonlinear global evaluation function, a solution set that minimizes the value of the nonlinear global evaluation function is obtained by solving, and the motionless double telecentric zoom scanning imaging system with good zoom scaling capability and high-precision scanning capability is obtained according to the solution set.

Background

The ghost imaging computing technology is one of the most effective modes for obtaining multi-dimensional and multi-spectral-band scene information by breaking through the signal processing limit of the traditional imaging system, and is suitable for the fields of monitoring, remote sensing, imaging under the condition of strong scattering media and the like. In order to solve the problem of uncertainty of photon transmission at a long distance, which brings degradation to a measurement substrate and the calculation burden of data volume sudden increase noise in a large-range dynamic scene, a new imaging system combining space-frequency multiplexing and heterogeneous multi-viewpoint channels is an effective mode, and the functions of zooming, scanning and the like need to be integrated for calculating a ghost imaging optical imaging system. The optical imager based on the computational ghost imaging technology can be divided into two parts, namely an active illumination module and a signal receiving module, wherein the active illumination module comprises a light source and a Digital Micromirror Device (DMD), and the signal receiving module mainly comprises a single photon detector and a condensing lens. In order to realize zooming and scanning functions of a traditional ghost imaging optical computing system, a zooming module and a scanning module are required to be additionally arranged, namely, a plurality of groups of lenses, a rotating mirror and a mechanical structure are added, so that not only is the system structure complicated and the reliability reduced, but also the real-time performance is difficult to realize due to the mechanical zooming and the scanning structure.

Disclosure of Invention

The patent sets out from the quick accurate zoom and scanning function of calculating ghost formation of image new system demand, to the defect of above-mentioned tradition calculation ghost formation of image optical system, provides a two telecentric zoom scanning imaging system of motionless type and the determining method of main structure parameter.

Therefore, the immobile double-telecentric zoom scanning imaging system provided by the invention comprises a laser modulation light source system, an immobile double-telecentric zoom scanning illumination system and a single-photon imaging system; the active illumination modulation light beam with high uniformity and parallelism, the rapid and accurate real-time zooming, zooming and scanning of the active illumination light beam and the computed ghost imaging combining space-frequency multiplexing and heterogeneous multi-viewpoint channels can be realized;

further, the invention discloses a method for determining main structure parameters of an immovable double-telecentric zoom scanning imaging system, which comprises the following steps:

s1: adopting a Gaussian bracket method to analyze the Gaussian solution characteristics of the system, and extracting zoom evaluation parameters capable of evaluating the zoom scaling capability of the motionless double-telecentric zoom scanning imaging system;

s2: according to a vector aberration theory, a Seidel aberration coefficient and a Snell's law, significant parameters and relevant mathematical models thereof which restrict the scanning performance of the stationary double-telecentric zoom scanning imaging system are provided, and then scanning evaluation parameters are extracted for evaluating the high-precision scanning capability of the system;

s3: and establishing a nonlinear global evaluation function by combining the zoom evaluation parameters and the scanning evaluation parameters, and performing optimal solution retrieval on the nonlinear global evaluation function to obtain the main structure of the immovable double-telecentric zoom scanning imaging system with good zoom scaling capability and high-precision scanning capability.

Further, the main structure of the fixed double telecentric zoom scanning imaging system is composed of n optical elements, wherein the mth and nth optical elements are MOEMS devices, and the 1 st to mth optical elements are equivalently regarded as one optical power phi₁The (1) optical component (1) treats the (m + 1) th to the (n) th optical elements as an equivalent optical power of phi₂The optical component 2 can be analyzed by a gauss bracket method to obtain the equivalent focal power phi of the immobile double telecentric zoom scanning imaging system_systemComprises the following steps:

Φ_system＝¹C_n＝[φ₁,-e′₁,…,φ_m,-e′_m,…,φ_n]

＝[Φ₁,-e′_m,Φ₂]≈0

wherein the content of the first and second substances,ⁱC_jrepresents a constant of Gauss,. phi_i(i-1, 2, …, n) is the focal power of different optical elements in the optical system, e'_i(i ═ 1,2, …, n-1) is the equivalent separation between optical element i and optical element i +1 of the optical system.

Preferably, the zoom evaluation parameter in step S1 is an error term of the zoom scaling characteristic of the motionless double telecentric zoom scanning imaging system.

Further, a zoom evaluation parameter A of the zoom scaling capability of the motionless double telecentric zoom scanning imaging system_zoomComprises the following steps:

wherein, scalar A_zoomError term, beta, characterizing the zoom scaling characteristics of a stationary double telecentric zoom scanning imaging system_minAnd beta_maxRespectively representing the minimum and maximum zoom magnifications of the system,andrespectively representing the minimum and maximum optical power of the MOEMS device 1,andthe minimum and maximum powers of the MOEMS device 2 are indicated, respectively.

Preferably, the scan evaluation parameters for evaluating the high-precision scanning imaging capability of the motionless double telecentric zoom scanning imaging system in the step S2 include optical power, initial order distortion and error terms of the central angle of the scanning beam of the motionless double telecentric zoom scanning imaging system.

Further, an error term A of optical power of the motionless double telecentric zoom scanning imaging system_focComprises the following steps:

A_foc＝|¹C_n|

wherein the content of the first and second substances,¹C_nis a constant gaussian; further, the air conditioner is provided with a fan,¹C_n＝[φ₁,-e′₁,…,φ_m,-e′_m,…,φ_n]＝[Φ₁,-e′_m,Φ₂]。

further, according to the vector aberration theory, the error term A of the initial distortion of the immobile double telecentric zooming scanning imaging system_abeComprises the following steps:

wherein the main structure of the immobile double telecentric zoom scanning imaging system comprises n optical elements,the equivalent field of view for the jth optical element,A_j＝(u'_j-u_j)/(1/n_j+1-1/n_j)；u_jand u'_jRespectively representing the edge ray incidence and exit angles, n, of the j-th optical element_jDenotes the refractive index after the jth optical element, h_jIndicating the marginal ray height of the jth optical element,represents the central ray height of the jth optical element,andrespectively representing the central ray incidence and exit angles of the jth optical element, c_jThe curvature of the vertex, k, of the surface shape of the jth optical element_jAnd (3) a conic constant representing the surface shape of the jth optical element.

Further, the error term A of the central angle of the scanning beam of the motionless double telecentric zoom scanning imaging system_cenComprises the following steps:

wherein, theta_xAnd theta_yRespectively representing the central angle of the actual outgoing beam of the system design,andthe central angles of the system exit beams required by the system design are respectively indicated.

Further, a nonlinear global evaluation function can comprehensively evaluate the zooming and zooming capabilities and the high-precision scanning capabilities of the motionless double-telecentric zooming scanning and imaging system, and the nonlinear global evaluation function is specifically as follows:

wherein the superscript l represents the l-th sampling focal point of the zoom system, M represents the number of sampling focal points, e_jDenotes the equivalent spacing, α, between the j-th and j + 1-th optical elements_jThe tilt angle of the j-th optical element profile, c_i、c_mAnd c_nRespectively represent the apex curvatures, k, of the ith, mth and nth optical element profiles_i、k_mAnd k_nParameters of quadric surfaces respectively representing the surface shapes of the ith, mth and nth optical elements, v_i(i ═ 1,2,3) represents the weight of the corresponding term; | | non-woven hair₁Representing a1 norm.

Preferably, in step S3, a global optimization algorithm is used to perform global optimal solution retrieval on the nonlinear global evaluation function, a solution set that minimizes the value of the nonlinear global evaluation function is obtained by solving, and the stationary double-telecentric zoom-scan imaging system with good zoom-zoom capability and high-precision scanning capability is obtained according to the solution set.

Compared with the prior art, the invention has the following beneficial effects:

mechanical motion devices with complex structures and slow response are eliminated, MOEMS devices are adopted, and the characteristics of high response speed and high control precision are fully utilized to realize real-time zooming and scanning functions.

In some embodiments of the invention, the following advantages are also provided:

the active illumination module adopts a structure that a parallel light source is matched with a double telecentric optical system, so that long-distance accurate and uniform illumination can be realized;

in the design stage, the zoom capability and the imaging quality of the immobile double-telecentric zoom scanning imaging system are simultaneously evaluated, a nonlinear global evaluation function is established for optimal structure retrieval, and optical system parameters meeting design requirements can be quickly and efficiently obtained.

Drawings

FIG. 1 is a schematic diagram of an initial state of an immobile double telecentric zoom scanning imaging system;

FIG. 2 is a schematic view of a zoom state of a stationary double telecentric zoom scanning imaging system;

FIG. 3 is a scanning state diagram of a stationary double telecentric zoom scanning imaging system;

FIG. 4 is a schematic diagram of a paraxial ray tracing model of a main structure of a stationary double telecentric zoom scanning imaging system;

FIG. 5 is a schematic diagram of an optical axis ray tracing model based on a plane-symmetric optical system;

fig. 6 is a flowchart of a main structure parameter determination method.

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.

As shown in fig. 1-3, the stationary double telecentric zoom scanning imaging system in the embodiment of the invention is composed of a laser modulation light source system 1, a stationary double telecentric zoom scanning illumination system 2 and a single photon imaging system 3, wherein 4 in the drawings represents a target object. The laser modulation light source system 1 adopts a micromirror array (DMD) spatial light modulator to modulate a laser light source, and obtains a light intensity modulated parallel light beam. The immovable double-telecentric zoom scanning illumination System 2 adopts a Micro-opto-Electro-Mechanical System (MOEMS) device, specifically, the immovable double-telecentric zoom scanning illumination System 2 comprises a MOEMS device 21 and a MOEMS device 22, which can simultaneously realize real-time zooming and scanning functions, and the immovable double-telecentric zoom scanning illumination System adopts a structure that a parallel light source is matched with a double-telecentric optical System, so that long-distance accurate and uniform irradiation can be realized. The single photon imaging system 3 collects diffuse reflection information generated by the modulated beam illuminating the target.

Structural requirements (e.g., number of facets, pupil aperture, etc.) and zoom scan requirements (e.g., zoom magnification of the system, scan range, power variation range of the MOEMS device, etc.) need to be determined during system design.

The fixed double telecentric zoom scanning imaging system is an optical system structure which adopts a conical surface and comprises two MOEMS devices, and the Gaussian solution characteristics of the system structure are analyzed based on the system structure. The fixed double telecentric zoom scanning imaging system consists of n optical elements, wherein the mth and nth optical elements are MOEMS devices, as shown in FIG. 4, the 1 st to mth optical elements are equivalently regarded as one optical power of phi₁The (1) optical component (1) treats the (m + 1) th to the (n) th optical elements as an equivalent optical power of phi₂The optical component 2. n is_iDenotes the refractive index before the i-th element, F₁And F₁' front and back foci, respectively, of optical component 1, F₂And F₂' then the front focus and the back focus of the optical component 2, respectively. S_F1And S'_F1Respectively the front and back focal lengths, S, of the optical component 1_F2And S'_F2Then divide intoRespectively the front focal length and the back focal length of the optical component 2. Definition of phi_i(i-1, 2, …, n) is the focal power of different optical elements in the optical system, e'_i(i ═ 1,2, …, n-1) is the equivalent separation between optical element i and optical element i +1 of the optical system. To describe the first order characteristics of the ith to jth components of an optical system, k.tanaka defines four Gaussian Constants (GGC's), one for each of the i to j components of the optical systemⁱA_j，ⁱB_j，ⁱC_jAndⁱD_jtheir expressions are as follows:

the equivalent focal power phi of the system can be obtained by analyzing by using a Gaussian bracket method_systemComprises the following steps:

the near-axis tracking formula of the bracket method of gauss is as follows:

wherein h is_jIs the edge ray height of the jth conical surface, h_iIs the edge ray height of the ith conic surface u_iIs the edge ray incident angle of the ith conical curved surface, u'_jIs the edge ray exit angle of the jth conical surface.

A back focal length S 'of the optical component 1 according to the formula (3)'_F1Front focal length S of optical component 2_F2It can be expressed as:

the formulas (4) and (5) respectively relate to the focal power phi of the MOEMS device_mAnd phi_nSo that the zoom scaling factor of the motionless double-telecentric zoom scanning imaging system can be controlled by phi_mAnd phi_nAs shown in equation (6), β represents the zoom magnification of the system.

And the zoom evaluation parameter of the fixed double telecentric zoom scanning capability is shown as the formula (7).

Wherein, scalar A_zoomAn error term representing the zooming and scaling characteristics of the fixed double telecentric zooming and scanning imaging system; beta is a_minAnd beta_maxRespectively representing the minimum zooming magnification and the maximum zooming magnification of the system;andrespectively representing the minimum and maximum optical power of the MOEMS device 1,andthe minimum and maximum powers of the MOEMS device 2 are indicated, respectively.

The system parameter controllable variables of the immobile double telecentric zoom scanning imaging system only comprise the surface shape parameters and the deflection angle of the MOEMS device, so the following constraint conditions are made for the system structure: first, the light of the system is definedIn order to ensure that the OAR of the system is fixed and unchangeable in the zooming process, in the design process of the system, only a method of an inclined surface is adopted to realize the non-shielding off-axis of the system, the constraint condition is very important for the stability of each optical element and an emergent light beam of the immovable double telecentric zooming imaging system, and in addition, the aspheric surface part of the surface shape of the optical element can not influence the normalized field vector of the system; secondly, assume that the designed off-axis optical system is symmetric about the yoz plane, therefore, the spherical portion of the optical element surface shape will not cause x-direction shift to the normalized field-of-view vector of the system; based on the ray tracing of the fixed OAR of the system, the field of view offset vector of the system can be directly calculated

According to the vector aberration theory, the equivalent field of view of the j optical element of the fixed double-telecentric zoom scanning imaging system and the off-axis optical system is analyzedAs shown in formula (8). The aberration theory analysis of the present technique is exemplified by an off-axis optical system, but is also applicable to an on-axis optical system (i.e., the field offset vector is zero).

Wherein the content of the first and second substances,representing a normalized field-of-view vector,representing the field offset vector for the jth optical element.

An optical axis ray tracing model, using a three-component plane-symmetric optical system as an example, is shown in fig. 5, in which,unit normal vector, o, representing optical surface of j-th optical element_jDenotes the apex of the face shape of the j-th optical element, S_jDenotes the optical surface of the jth optical element, the vertex o of the face shape of the jth optical element_jAngle of inclination alpha of_jEqual to the OAR incident angle, and also vectorAnd the included angle of the OAR is equal.

Vector of FIG. 5 based on OAR local coordinates of each system optical elementMay be represented by formula (9).

Wherein, SRM_jAnd SRN_jRespectively representing vectorsNormalized direction cosines along the y and z directions. Thus, the tilt angle α of the jth optical element of the system_jMay be represented by formula (10).

α_j＝arcsin(SRM_j) (10)

Therefore, according to snell's law, the scanning range of the motionless double telecentric zoom scanning imaging system can be quantified by two directions of the x-axis and the y-axis with reference to the OAR of the object plane incident to the system, the clockwise direction is a negative angle, and the counterclockwise direction is a positive angle, whereinShowing the scan range in the x-direction of the system,then represents the scan range in the y-direction of the system and theta_xAnd theta_yRespectively, the central angle of the outgoing beam that is actual for the system design. Specifically, the formula is shown in (11).

Wherein, Delta_xAnd Δ_yRespectively representing the deflectable angles of the MOEMS device 2 in the x-direction and the y-direction.

Therefore, the beam center angle (θ) can be scanned by the system during the system design stage_x,θ_y) The scanning range of the motionless double telecentric zooming scanning imaging system is regulated and controlled by the constraint of the control system.

Therefore, an error term A for representing the central angle of the scanning beam of the stationary double-telecentric zoom scanning imaging system_cenAnd may be represented by formula (12).

Wherein the content of the first and second substances,andrespectively, the central angles of the system exit beams required by the system design.

Further, the field of view offset vector of the system can be represented by equation (13).

Wherein the content of the first and second substances,represents the field offset vector of the jth optical element in the y-direction;represents the edge ray exit angle of the jth optical element;represents the central ray height of the jth optical element; c. C_jRepresenting the apex curvature of the jth optical element facet.

According to the vector aberration theory and the Seidel aberration coefficient of the coaxial system, parameters for representing the initial-order aberration of the system can be obtained through analysis. Distortion, which is an important image quality index of a double telecentric optical system, is selected as an evaluation index for describing the uniformity of an emergent beam of a stationary double telecentric zoom scanning imaging system in the invention. Because the system is designed to be a double telecentric illumination system, only the central zero-degree field of view of the system needs to be considered. In addition, the system power is selected as an evaluation index describing the parallelism of the system exit beam.

According to the vector aberration theory, the first order distortion coefficient of an off-axis system can be expressed as

Wherein the content of the first and second substances,

vector A_abeAn error term representing the initial distortion of the immobile double telecentric zoom scanning imaging system; w_311jRepresenting the first order distortion coefficient of the jth optical element of the coaxial system;representing the equivalent field of view of the jth optical element of the off-axis system; s_ⅤjFifth Seidel aberration coefficient, superscript sph and asp, representing the jth optical element of the on-axis systemh represents a spherical surface and an aspherical surface, respectively; h is_jIndicating the marginal ray height of the jth optical element,denotes the height of the central ray of the jth optical element, u_jAnd u'_jRespectively representing the edge ray incidence angle and the exit angle of the jth optical element,andrespectively representing the central ray incidence angle and the exit angle of the jth optical element;c_jthe curvature of the vertex, k, of the surface shape of the jth optical element_jQuadric parameter, n, representing the surface shape of the jth optical element_jIndicating the refractive index before the jth optical element.

And the power phi of the double telecentric system according to equation (2)_systemShould be zero, so the error term A representing the focal power of the motionless double telecentric zoom scanning imaging system_focAnd may be represented by formula (17).

A_fo_c＝|¹C_n| (17)

And establishing a nonlinear global evaluation function E capable of directly and comprehensively evaluating the zooming and zooming capabilities and the high-precision scanning capabilities of the zooming and scanning system by combining the Gaussian solution characteristic analysis and the initial aberration analysis of the immobile double-telecentric zooming and scanning imaging system and applying system parameter variables and invariants in the zooming and scanning process of the system. The initial aberration (mainly distortion) of the zoom scanning system, the zoom capability (such as zoom magnification) of the system, and the gaussian characteristic (such as the focal power) of the system are all used as comprehensive evaluation indexes. The nonlinear global evaluation function is specifically shown as formula (18).

Wherein, the superscript l represents the l sampling focal length point of the zoom system; m represents the number of sampling focal points; e.g. of the type_jDenotes the equivalent spacing, α, between the j-th and j + 1-th optical elements_jThe tilt angle of the j-th optical element profile, c_i、c_mAnd c_nRespectively representing the curvature of the vertex of the ith, mth and nth optical element planes; k is a radical of_i、k_mAnd k_nQuadric surface parameters respectively representing the ith, mth and nth optical element surface shapes; v is_i(i ═ 1,2,3) represents the weight of the corresponding term; | | non-woven hair₁Representing a1 norm.

The method for determining the structural parameters of the immobile double telecentric zoom scanning imaging system specifically comprises the following steps:

a1, determining the structural requirements (such as the number of surface shapes, the aperture of a pupil and the like) and the zooming requirements (such as the zoom magnification, the scanning range and the optical power variation range of an MOEMS device) of the fixed double telecentric zooming scanning imaging system;

a2, adopting a Gaussian bracket method to analyze the Gaussian solution characteristics of the immobile double telecentric zoom scanning imaging system, and extracting zoom evaluation parameters capable of evaluating the zoom scaling capability of the system;

a3, according to a vector aberration theory, a Seidel aberration coefficient and a Snell's law, providing significant parameters and relevant mathematical models thereof for restricting the scanning performance of the immobile double telecentric zoom scanning imaging system, and further extracting scanning evaluation parameters for evaluating the high-precision scanning capability of the system;

a4, establishing a non-linear global evaluation function of the immobile double-telecentric zoom scanning imaging system by combining the zoom evaluation parameters and the scanning evaluation parameters, and performing optimal solution retrieval on the non-linear global evaluation function;

a5, judging whether the optimization termination condition is met, if not, returning to the step A4, and if so, entering the next step;

a6, converting the optimal solution data obtained by retrieval into main structure parameters of a stationary double-telecentric zoom scanning imaging system;

a7, outputting main structural parameters of the motionless double telecentric zoom scanning imaging system.

In summary, the design process of the motionless double telecentric zoom scanning imaging system mainly has three key points: 1) analyzing a main structure of the immovable double-telecentric zoom scanning imaging system by using a Gaussian bracket method, extracting zoom evaluation parameters capable of evaluating zoom scaling capability of the immovable double-telecentric zoom scanning imaging system, and realizing a required zoom scaling range under the condition that the variation range of the optical power of the MOEMS device is limited; 2) according to the vector aberration theory and the Seidel aberration coefficient, the distortion coefficient of the stationary double telecentric zoom scanning imaging system is characterized analytically, and then the high-precision scanning function is realized on the premise of ensuring the parallelism and uniformity of light beams by combining the Snell's law; 3) a nonlinear global evaluation function capable of comprehensively evaluating the zooming and zooming capabilities and the high-precision scanning capabilities of the motionless double-telecentric zooming scanning imaging system is established, and a global optimal solution retrieval is carried out on the evaluation function by using a global optimization algorithm (such as a genetic algorithm), so that the main structure of the motionless double-telecentric zooming scanning system with good zooming and zooming capabilities and high-precision scanning capabilities can be directly obtained.

The invention provides a computer storage medium, wherein a program capable of running in a processor is stored, and the program can realize the main structure parameter determination method of the immobile double-telecentric zoom scanning imaging system in the process of being run by the processor.

The fixed double telecentric zoom scanning imaging system and the method for determining the main structure parameters provided by the embodiment of the invention have the following three advantages:

(1) the composite sensing, immobile double telecentric zooming scanning imaging system obtains parallel light beams modulated by light intensity by using a DMD, can simultaneously realize two functions of light beam zooming and scanning by using the immobile double telecentric zooming scanning illumination system, and finally collects diffuse reflection information generated by irradiating a target by using a modulated light beam by using a single photon imaging system, thereby finally realizing the calculation ghost imaging combining space-frequency multiplexing and heterogeneous multi-viewpoint channels.

(2) The zoom evaluation method has the advantages that the imaging performance is high, the MOEMS device is adopted to realize the zooming and scanning functions of the system, moving parts required by the traditional zooming system are abandoned, the zooming and scanning speed and precision of the system are effectively improved, and in addition, the zoom evaluation parameter A capable of evaluating the zooming and zooming capacity of the system is extracted by analyzing the Gaussian solution characteristic and the initial aberration coefficient of the immobile double-telecentric zoom scanning imaging system_zoomAnd a scanning evaluation parameter A for evaluating the quality of the outgoing beam of the system_abeAnd A_focAnd a scan evaluation parameter A capable of evaluating accuracy of a scan center of the system_cenThe zooming and zooming precision and the scanning precision of the system are ensured in the design stage.

(3) The design method is efficient, the nonlinear global evaluation function E capable of simultaneously evaluating the zooming and zooming capabilities and the high-precision scanning capabilities of the immovable double-telecentric zooming and imaging system is established, the system Gaussian structure design problem is converted into the problem of retrieving the optimal solution by using the nonlinear global evaluation function E, the automatic retrieval of the optimal Gaussian structure of the immovable double-telecentric zooming and imaging system is further realized, and the design efficiency of the complex optical system is greatly improved.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.