1. A spectrometer for measuring a spectrum of an object to be measured, the spectrometer comprising a spectrometer body and a sampling module,

the spectrometer main body is provided with a light inlet; and

the sampling module is arranged on the spectrometer main body and comprises a light source fixing seat and at least one light source,

the light source fixing seat is provided with at least one cup-shaped reflecting curved surface; and

the at least one light source is arranged on the light source fixing seat, the cup-shaped reflection curved surface surrounds the light source, the illumination light emitted by the light source is reflected and converged by the cup-shaped reflection curved surface and transmitted to the object to be measured, the object to be measured diffusely reflects the illumination light into light to be measured, and the light to be measured enters the spectrometer body through the light inlet and is measured by the spectrometer body.

2. The spectrometer of claim 1, wherein the light source holder further has first and second opposing openings, wherein the second opening is located between the first opening and the light inlet of the spectrometer body.

3. The spectrometer of claim 1, wherein the cup-shaped reflective curved surface has a light exit cross-section and the light source is located within the light exit cross-section.

4. The spectrometer of claim 1, wherein the cup-shaped reflective curved surface is a paraboloid.

5. The spectrometer of claim 2, wherein the cup-shaped reflective curved surface has an opposing light exit cross-section and a beam exit through which the light source passes, wherein the light exit cross-section has a diameter greater than a diameter of the beam exit.

6. The spectrometer of claim 5, wherein the diameter of the light source in a direction perpendicular to its optical axis is smaller than the diameter of the beam-receiving opening.

7. The spectrometer of claim 5, wherein the light source holder further comprises an annularly extending reflective surface extending from an edge of the light exit section in a direction away from the beam exit opening.

8. The spectrometer of claim 1, wherein an optical axis of the cup-shaped reflective curved surface is coaxial with an optical axis of the light source.

9. The spectrometer of claim 2, wherein the sampling module further comprises a plurality of lenses disposed between the second opening of the light source holder and the light inlet of the spectrometer body.

10. The spectrometer of claim 9, wherein the lenses comprise a first lens, a second lens and a third lens arranged in sequence in a direction from the first opening to the second opening, the first lens being a plano-convex lens, the second lens being a biconvex lens, and the third lens being a meniscus lens.

11. The spectrometer of claim 9, wherein the lenses comprise a first lens and a second lens arranged in sequence in a direction from the first opening to the second opening, the first lens being a meniscus lens and the second lens being a biconvex lens.

12. The spectrometer of claim 2, wherein the sampling module further comprises a light shielding plate disposed around the first opening and having a light passing hole exposing the first opening.

13. The spectrometer of claim 12, wherein the absorbance of the light shield is greater than or equal to 1.5.

14. The spectrometer of claim 2, wherein the light source has a lens at an end facing the first opening.

15. The spectrometer of claim 2, wherein an optical axis of the cup-shaped reflective curved surface passes obliquely through the first opening.

16. The spectrometer of claim 2, wherein the at least one cup-shaped reflective curved surface is a plurality of cup-shaped reflective curved surfaces and the at least one light source is a plurality of light sources, wherein optical axes of the cup-shaped reflective curved surfaces obliquely pass through the first opening and intersect outside the first opening.

17. A sampling module for collecting the spectrum of an object to be measured comprises a light source fixing seat and at least one light source,

the light source fixing seat is provided with at least one cup-shaped reflecting curved surface; and

the at least one light source is arranged on the light source fixing seat, the cup-shaped reflecting curved surface surrounds the light source, the illumination light emitted by the light source is reflected and converged by the cup-shaped reflecting curved surface and transmitted to the object to be detected, and the object to be detected diffusely reflects the illumination light into light to be detected and transmits the light to the sampling module.

18. The sampling module of claim 17, wherein the light source holder further has first and second opposing openings.

19. The sampling module of claim 17, wherein the cup-shaped reflective curved surface has a light exit section and the light source is located within the light exit section.

20. The sampling module of claim 17, wherein the cup-shaped reflective curved surface is a paraboloid.

21. The sampling module of claim 18, wherein the cup-shaped reflective curved surface has an opposing light exit cross-section and a beam-receiving opening through which the light source passes, wherein the light exit cross-section has a diameter greater than a diameter of the beam-receiving opening.

22. The sampling module of claim 21, wherein a diameter of the light source in a direction perpendicular to its optical axis is smaller than a diameter of the beam-receiving port.

23. The sampling module of claim 21, wherein the light source holder further comprises an annularly extending reflective surface extending from an edge of the light exit section in a direction away from the beam-converging opening.

24. The sampling module of claim 17, wherein an optical axis of the cup-shaped reflective curved surface is coaxial with an optical axis of the light source.

25. The sampling module of claim 18, further comprising a plurality of lenses, wherein the second opening is located between the first opening and the lenses.

26. The sampling module of claim 25, wherein the lenses comprise a first lens, a second lens and a third lens arranged in sequence along a direction from the first opening to the second opening, the first lens is a plano-convex lens, the second lens is a biconvex lens, and the third lens is a meniscus lens.

27. The sampling module of claim 25, wherein the lenses comprise a first lens and a second lens arranged sequentially along a direction from the first opening to the second opening, the first lens being a meniscus lens and the second lens being a biconvex lens.

28. The sampling module of claim 18, wherein the sampling module further comprises a light shielding sheet disposed around the first opening and having a light passing hole exposing the first opening.

29. The sampling module of claim 28, wherein the absorbance of the light shield is greater than or equal to 1.5.

30. The sampling module of claim 18, wherein the light source has a lens at an end toward the first opening.

31. The sampling module of claim 18, wherein an optical axis of the cup-shaped reflective curved surface passes obliquely through the first opening.

32. The sampling module of claim 18, wherein the at least one cup-shaped reflective curved surface is a plurality of cup-shaped reflective curved surfaces and the at least one light source is a plurality of light sources, wherein optical axes of the cup-shaped reflective curved surfaces obliquely pass through the first opening and intersect outside the first opening.

33. A spectrometer for measuring a spectrum of an object to be measured, the spectrometer comprising a spectrometer body and a sampling module,

the spectrometer main body is provided with a light inlet; and

the sampling module is disposed on the spectrometer body, the sampling module comprising:

a plurality of lenses arranged between the object to be measured and the light inlet of the spectrometer main body,

the external light is transmitted to the object to be measured to form light to be measured, and the light to be measured enters the spectrometer main body through the plurality of lenses and the light inlet in sequence and is measured by the spectrometer main body.

34. The spectrometer of claim 33, wherein the lenses comprise a first lens, a second lens and a third lens arranged in sequence in the direction of the light to be detected, the first lens being a plano-convex lens, the second lens being a biconvex lens, and the third lens being a meniscus lens.

35. The spectrometer of claim 33, wherein the lenses comprise a first lens and a second lens arranged in sequence in a direction of the light to be detected passing, the first lens being a meniscus lens and the second lens being a biconvex lens.

[ background of the invention ]

Generally, a sampling module of a spectrometer includes at least one bulb and a light collecting lens, wherein the bulb projects light to a sample to be detected, the light enters the sample to be detected, then is reflected by diffuse reflection, passes through the light collecting lens, and finally enters the spectrometer to obtain spectral information of the sample.

However, the light receiving efficiency of the conventional sampling module after diffuse reflection is poor, and the light receiving efficiency is usually increased by increasing the wattage of the lamp or increasing the number of the lamps to enhance the intensity of the light source, but increasing the intensity of the light source or increasing the number of the lamps increases the load of the system power supply and increases the power consumption, and increases the heat energy, which causes errors in measurement.

Another sampling module is to use a bulb with a reflective cup to increase the light intensity on the object to be measured, but the volume of the bulb containing the reflective cup is too large, which causes a conflict in the volume for the design of the reflective module, and is not favorable for the application of the handheld spectrometer. In addition, the configuration of the bulbs is difficult to concentrate, the distance between each bulb is increased, the distance between each bulb and the plane of the object to be measured is also increased, although the light emitting efficiency can be increased by the reflecting lamp cup, the light receiving efficiency is also reduced along with the increase of the distance between each bulb and the plane of the object to be measured, and the spectrum quality is influenced by more serious stray light.

[ summary of the invention ]

The invention provides a spectrometer which can achieve high spectral quality and can have a small volume.

An embodiment of the invention provides a spectrometer for measuring a spectrum of an object to be measured, the spectrometer including a spectrometer body and a sampling module. The spectrometer main body is provided with a light inlet, and the sampling module is arranged on the spectrometer main body. The sampling module comprises a light source fixing seat and at least one light source. The light source fixing seat is provided with at least one cup-shaped reflecting curved surface. The light source is arranged on the light source fixing seat, and the cup-shaped reflecting curved surface surrounds the light source. The illumination light emitted by the light source is reflected and converged by the cup-shaped reflecting curved surface and transmitted to the object to be measured, the object to be measured diffusely reflects the illumination light into light to be measured, and the light to be measured enters the spectrometer body through the light inlet and is measured by the spectrometer body.

An embodiment of the invention provides a sampling module for collecting a spectrum of an object to be measured. The sampling module includes: the light source fixing seat is provided with at least one cup-shaped reflecting curved surface. The cup-shaped reflecting curved surface surrounds the light source, the illumination light emitted by the light source is reflected and converged by the cup-shaped reflecting curved surface and transmitted to the object to be measured, the object to be measured diffusely reflects the illumination light into light to be measured, and the light to be measured is transmitted back to the sampling module.

An embodiment of the invention provides a spectrometer for measuring a spectrum of an object to be measured. The spectrometer comprises: spectrometer main part and sampling module. The spectrometer body is provided with a light inlet. The sampling module is configured on the spectrometer main body. The sampling module includes: and the lenses are arranged between the object to be measured and the light inlet of the spectrometer main body. The external light is transmitted to the object to be measured to form light to be measured, and the light to be measured enters the spectrometer main body through the plurality of lenses and the light inlet in sequence and is measured by the spectrometer main body.

In the spectrometer of the embodiment of the invention, the light source fixing seat of the sampling module is provided with the cup-shaped reflecting curved surface so as to concentrate the light emitted by the light source on the object to be measured, so that the intensity of the light to be measured entering the spectrometer main body can be improved, and the spectrum quality is further improved. In addition, because the cup-shaped reflecting curved surface is the surface of the light source fixing seat, a bulb containing a lamp cup is not needed, so that the cost of the bulb used can be reduced, the volume of the sampling module can be reduced, and the volume of the spectrometer can be further reduced. In addition, the volume of the spectrometer can be small, so that the optical path is short, and the optical efficiency and the spectral quality can be improved.

[ description of the drawings ]

FIG. 1 is a schematic cross-sectional view of a spectrometer according to an embodiment of the present invention.

FIG. 2 is a front view of a portion of a sampling module of the spectrometer of FIG. 1.

FIG. 3 is a schematic optical path diagram of a portion of the components of a spectrometer according to another embodiment of the present invention.

Fig. 4 and 5 illustrate two usage scenarios of detaching the light source holder from the spectrometer of fig. 1, respectively.

FIG. 6 is a graph comparing the light intensity of the light to be measured collected by the spectrometer of FIG. 1 and a spectrometer without a cup-shaped reflective curved surface.

[ notation ] to show

50 object to be measured

52 light to be measured

60 external light

100 spectrometer

200 spectrometer body

230 light inlet

300 sampling module

310 light source holder

312 first opening

314 second opening

316 cup-shaped reflecting curved surface

318 annular extended reflection surface

319 outer surface

320 light source

321 illumination light

322. 420, 420a lens

330 light shading sheet

332 light through hole

400 lens module

410 lens barrel

422. 422a first lens

424. 424a second lens

426 third lens

430 light-passing opening

Optical axis A1, A2

D1, D2, D3 diameter

S1 light emergent section

And S2, a beam-closing port.

[ detailed description ] embodiments

Fig. 1 is a schematic cross-sectional view of a spectrometer according to an embodiment of the present invention, and fig. 2 is a front view of a portion of a sampling module of the spectrometer of fig. 1. Referring to fig. 1 and fig. 2, a spectrometer 100 of the present embodiment is used for measuring a spectrum of an object 50 to be measured, and the spectrometer 100 includes a spectrometer body 200 and a sampling module 300. Spectrometer body 200 has light inlet 230, and sampling module 300 is disposed on spectrometer body 200 to form spectrometer 100. The sampling module 300 includes a light source holder 310 and at least one light source 320 (in the embodiment, a plurality of light sources 320 are taken as an example). The light source holder 310 has a first opening 312, a second opening 314 and at least one cup-shaped reflective curved surface 316 (in the embodiment, a plurality of cup-shaped reflective curved surfaces 316 are taken as an example), wherein the number of the at least one cup-shaped reflective curved surface 316 corresponds to the number of the at least one light source 320. The light source holder 310 also includes an outer surface 319 around the first opening 312. The second opening 314 is located between the first opening 312 and the light inlet 230 of the spectrometer body 200. The light source 320 is disposed on the light source holder 310, and the cup-shaped reflective curved surface 316 surrounds the light source 320. In the present embodiment, the light source 320 is a bulb, which may have a lens 322 at an end facing the first opening 312. However, in other embodiments, the bulb may not have a lens at the end facing the first opening 312. In other embodiments, the Light source 320 may be, for example, a Light Emitting Diode (LED), which is not limited in the invention.

The illumination light 321 emitted by the light source 320 is reflected and converged by the cup-shaped reflective curved surface 316 and transmitted into the object 50 through the first opening 312, the object 50 diffusely reflects the illumination light into the light to be measured 52, and the light to be measured 52 sequentially enters the spectrometer body 200 through the first opening 312, the second opening 314 and the light inlet 230 and is measured by the spectrometer body 200. In the present embodiment, the diameter of the first opening 312 falls within a range of 6 mm to 20 mm, for example.

In the present embodiment, the cup-shaped reflecting curved surface 316 has a light emitting section S1, and the light source 320 is located in the light emitting section S1, and the cup-shaped reflecting curved surface 316 is, for example, a paraboloid for forming the illumination light 321 into parallel light. The cup-shaped reflecting curved surface 316 has a beam-closing opening S2 opposite to the light-emitting section S1, and the light source 320 passes through the beam-closing opening S2, wherein the diameter D1 of the light-emitting section S1 is larger than the diameter D2 of the beam-closing opening S2. In the present embodiment, the diameter D1 of the light exit section S1 falls within a range of 4 mm to 9 mm. The diameter D2 of the convergence S2 was in the range of 3 mm to 4 mm. Further, in the present embodiment, the diameter D3 of the light source 320 in the direction perpendicular to its optical axis a1 (the direction of the principal ray of the illumination light) is smaller than the diameter D2 of the beam-receiving opening S2, and the optical axis a2 of the cup-shaped reflective curved surface 316 is coaxial with the optical axis a1 of the light source 320. In addition, the light source fixing base 310 further has an annularly extending reflection surface 318 extending from the edge of the light exit section S1 to a direction away from the beam receiving opening S2. In the present embodiment, the diameter D3 is in the range of 2.5 mm to 3.5 mm.

In the spectrometer 100 of the present embodiment, since the light source fixing base 310 of the sampling module 300 has the cup-shaped reflecting curved surface 316 to concentrate the illumination light 321 emitted by the light source 320 on the object 50 to be measured, the intensity of the light 52 to be measured entering the spectrometer body 200 can be improved, and the spectrum quality can be further improved. In addition, since the cup-shaped reflecting curved surface 316 is the surface of the light source holder 310, a bulb containing a lamp cup is not needed, which not only reduces the cost of the bulb used, but also reduces the volume of the sampling module 300, and further reduces the volume of the spectrometer 100. In addition, since the volume of the sampling module 300 is small, the optical path distance from the object 50 to the spectrometer body 200 of the light to be measured 52 is short, and thus the optical efficiency and the spectral quality can be improved.

In the present embodiment, the optical axis a2 of the cup-shaped curved reflective surface 316 obliquely passes through the first opening 312. In addition, in the present embodiment, the optical axis a2 of the cup-shaped curved reflective surface 316 obliquely passes through the first opening 312 and intersects the first opening 312. In other words, the optical axes a2 intersect inside the object 50, so that part of the illumination light 321 can penetrate into the object 50, and the substance inside the object 50 receives the illumination light and reflects the test light 52, which is helpful for the spectrometer 100 to measure the spectrum of the substance inside the object 50.

In the embodiment, the sampling module 300 further includes a light shielding sheet 330 disposed around the first opening 312 and having a light passing hole 332 exposing the first opening 312, wherein an absorbance (absorbance) of the light shielding sheet 330 is greater than or equal to 1.5, wherein the absorbance is an absorbance in spectroscopy, which is defined as-log₁₀(T), wherein T is the light transmittance, i.e. the ratio of the light intensity of the transmitted light divided by the light intensity of the incident light. The light-shielding film can prevent stray light around the object 50 from entering the spectrometer 100 and interfering with the accuracy of the spectrum. In the present embodiment, the diameter of the light passing hole 332 may be in the range of 2 mm to 20 mm.

In the present embodiment, the sampling module further includes a lens module 400 disposed between the light source holder 310 and the spectrometer main body 200. The lens module 400 includes a lens barrel 410 and a plurality of lenses 420, wherein the lenses 420 are disposed between the second opening 314 of the light source holder 310 and the light inlet 230 of the spectrometer body 200, and are disposed in the light passing opening 430 of the lens barrel 410. The lenses 420 include a first lens 422, a second lens 424, and a third lens 426 arranged in sequence along a direction from the first opening 312 to the second opening 314, wherein the first lens 422 is a plano-convex lens (e.g., a plano-convex lens with a plane facing the first opening 312), the second lens 424 is a double-convex lens, and the third lens 426 is a meniscus lens (e.g., a positive meniscus lens with a concave surface facing the first opening 312. in the present embodiment, the second lens 424 and the third lens 426 form a cemented lens. furthermore, a clear aperture (clear aperture) of a convex surface of the first lens 422 falls within a range of 6 mm to 8 mm, a clear aperture of the second lens 424 falls within a range of 6 mm to 8 mm, and a clear aperture of the third lens 426 falls within a range of 6 mm to 9 mm. a distance on an optical axis between a plane of the first lens 422 and the object 50 to be measured falls within a range of 5 mm to 10 mm, the distance between the first lens 422 and the second lens 424 on the optical axis is in the range of 0.03 mm to 2 mm, and the distance between the third lens 426 and the light inlet 230 of the spectrometer main body 200 on the optical axis is in the range of 1 mm to 6 mm. The first lens 422 to the third lens 426 are, for example, spherical lenses, which are suitable for the light to be measured 52 with a wavelength ranging from 400 nm to 2500 nm, but the invention is not limited thereto. The purpose of the lenses 420 is to collect the light 52 to be measured at a large angle into the light inlet 230 of the spectrometer main body 200, so as to prevent the light 52 to be measured at a large angle from being unable to be measured, and the lenses 420 can effectively increase the light collection efficiency, thereby improving the signal-to-noise ratio. The light inlet 230 is, for example, a slit, and a conventional optical element in a spectrometer, such as a beam splitter, a photodetector, or other suitable optical elements may be disposed behind the slit.

FIG. 3 is a schematic optical path diagram of a portion of the components of a spectrometer according to another embodiment of the present invention. Referring to fig. 1 and 3, a plurality of lenses 420a in fig. 3 may be used to replace the plurality of lenses 420 in fig. 1 to form a spectrometer according to another embodiment. In the present embodiment, the lenses 420a include a first lens 422a and a second lens 424a arranged in sequence, the first lens 422a is a meniscus lens (e.g., a positive meniscus lens with a convex surface facing the object 50), and the second lens 424a is a biconvex lens.

In the present embodiment, the clear aperture of the convex surface of the first lens 422a falls within a range of 4 mm to 7 mm, and the clear aperture of the concave surface of the first lens 422a falls within a range of 2 mm to 4 mm. The distance between the convex surface of the first lens 422a and the object 50 on the optical axis is within a range of 10 mm to 15 mm. The mirror pitch of the first lens 422a and the second lens 424a on the optical axis falls within a range of 0.03 mm to 2 mm. The distance between the second lens 424a and the light inlet 230 of the spectrometer body 200 on the optical axis is in the range of 1 mm to 5 mm. The first lens 422a and the second lens 424a are spherical lenses, which are suitable for the light to be measured 52 with the wavelength ranging from 400 nm to 2500 nm.

Fig. 4 and 5 illustrate two usage scenarios of detaching the light source holder from the spectrometer of fig. 1, respectively. Referring to fig. 1, 4 and 5, in the present embodiment, the light source fixing base 310 is detachably mounted on the lens barrel 410 of the lens module 400. Therefore, when the light source holder 310 and the light source 320 thereon are not needed to provide the illumination light 321, or when the light source holder 310 and the light source 320 thereon provide insufficient light intensity and an external light source with stronger light intensity is needed, the light source holder 310 and the light source 320 thereon can be detached from the lens module 400, and only the spectrometer body 200 and the lens module 400 thereon are used to measure the spectrum of the object 50 to be measured. In the scenario of fig. 4, the external light 60 is transmitted to the object 50 to form the light to be measured 52. In detail, the external light 60 (e.g., light emitted by another light source) transmits through the object 50 to form the to-be-measured light 52, and the to-be-measured light 52 enters the spectrometer body 200 through the lens 420 and the light inlet 230. In the situation of fig. 5, the external light 60 absorbs a portion of the spectrum by the object 50 and diffusely reflects the unabsorbed spectrum to form the light to be measured 52, and the light to be measured 52 enters the spectrometer body 200 through the lens 420 and the light inlet 230.

FIG. 6 is a graph comparing the light intensity of the light to be measured collected by the spectrometer of FIG. 1 and a spectrometer without a cup-shaped reflective curved surface. Referring to fig. 1 and 6, it is apparent from fig. 6 that the light intensity of the light 52 to be measured received by the spectrometer 100 of fig. 1 is about 50% higher than that of the light to be measured collected by a spectrometer without the cup-shaped reflective curved surface, so that the spectrometer 100 of fig. 1 has good light efficiency.

In summary, in the spectrometer according to the embodiment of the invention, the light source fixing base of the sampling module has the cup-shaped reflecting curved surface to concentrate the light emitted from the light source on the object to be measured, so that the intensity of the light to be measured entering the spectrometer body can be increased, and the spectrum quality can be further improved. In addition, because the cup-shaped reflecting curved surface is the surface of the light source fixing seat, a bulb containing a lamp cup is not needed, so that the cost of the bulb used can be reduced, the volume of the sampling module can be reduced, and the volume of the spectrometer can be further reduced. In addition, the volume of the spectrometer can be small, so that the optical path is short, and the optical efficiency and the spectral quality can be improved.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the invention, which is defined by the appended claims and their equivalents. Moreover, not all objects or advantages or features disclosed herein are necessarily achieved by any one embodiment or claim of the invention. In addition, the abstract section and the title are provided for assisting the patent document retrieval and are not intended to limit the scope of the present invention. Furthermore, the terms "first," "second," and the like in the description or in the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.