Raman optical system with wide spectrum and high resolution

Abstract

The utility model provides a wide-spectrum and high-resolution Raman optical system, and belongs to the technical field of detection instruments. Comprising a slit, a first lens, a second lens, a third lens, a transmission grating, a fourth lens, a fifth lens, a reflector device and sixth lenses, wherein the first lens, the second lens and the third lens are respectively arranged at one side of the slit; the transmission grating is arranged at one side of the third lens; the fourth lens and the fifth lens are respectively arranged at the outer side of the transmission grating; the detector is arranged on the outer side of the eighth lens. By rotating the reflector device, the optical path can be changed, part of wave bands can be imaged on the detector, the positions of the detector and the lenses are not changed and are completely the same, and the spectrum can be imaged on the detector by rotating the reflector device for multiple times, so that on one hand, the cost of multiple detectors is saved; and on the other hand, the requirements of wide spectrum and high resolution can be met.

Description

Technical Field

[0001] This utility model belongs to the field of detection instrument technology, specifically relating to a wide-spectrum, high-resolution Raman optical system. Background Technology

[0002] Raman spectroscopy, based on the inelastic scattering of incident laser light by molecules, reflects molecular energy level information and possesses numerous advantages, leading to its wide range of applications. The spectral range and resolution determine the performance of a Raman spectrometer. Existing instruments requiring both broad spectral range and high resolution necessitate large-scale dispersion and detection systems, resulting in large size and high cost. Furthermore, current dispersive methods are limited by size and efficiency, making it difficult to simultaneously achieve broad spectral range and high resolution. Grating switching data lacks comparability, and detection systems exhibit spectral efficiency differences. Currently, issues related to detector and grating size, as well as system focal length, make miniaturization, broad spectral range, and high resolution in Raman spectrometers a significant challenge.

[0003] Most existing Raman spectrometers employ grating-based or prism-based methods. However, due to limitations in the size and efficiency of the gratings and detectors, they cannot simultaneously meet the requirements of a wide spectral range and high resolution. Although most grating Raman systems are equipped with two or three gratings, allowing switching between a wide spectral range and high resolution, the measurement data before and after grating switching lacks comparability and cannot fully reflect sample information. Furthermore, due to limitations in the photoelectric conversion efficiency of the detection system, the efficiency is high in the middle spectral bands but decreases at both ends, resulting in signal weakening and reduced resolution. Utility Model Content

[0004] The purpose of this invention is to provide a wide-spectrum, high-resolution Raman optical system, which aims to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A broadband, high-resolution Raman optical system includes a slit, a first lens, a second lens, and a third lens respectively disposed on one side of the slit, a transmission grating disposed on one side of the third lens, a fourth lens and a fifth lens respectively disposed outside the transmission grating, a mirror device disposed below the fifth lens, a sixth lens, a seventh lens, and an eighth lens respectively disposed on one side of the mirror device, and a detector disposed outside the eighth lens.

[0007] In a preferred embodiment of this utility model, the first lens, the second lens, and the third lens are arranged sequentially from left to right, with the first lens, the second lens, and the third lens being distributed alternately.

[0008] In a preferred embodiment of this utility model, the fourth lens and the fifth lens are bonded together, and the bonding surfaces of the fourth lens and the fifth lens fit together.

[0009] As a preferred scheme of the utility model, the mirror device is rotary.

[0010] As a preferred scheme of the utility model, the sixth lens, the seventh lens and the eighth lens are arranged in order from right to left, and the sixth lens, the seventh lens and the eighth lens are distributed at intervals.

[0011] As a preferred scheme of the utility model, the detector is used for receiving the light signal after convergence.

[0012] Compared with the prior art, the utility model has the beneficial effects that through the rotary mirror device, the light path can be changed, part of waveband is imaged on the detector, the detector and the position of each lens are completely same without change, and the spectrum can be segmented and imaged on the detector through multiple rotation of the mirror device, so that the cost of multiple detectors is saved on the one hand, and the requirements of wide spectrum and high resolution are realized on the other hand. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor under the premise of the drawings. Among them:

[0014] Figure 1 Optical principle of the utility model Figure One ;

[0015] Figure 2 Optical principle of the utility model Figure Two .

[0016] In the drawing: 1, slit; 2, first lens; 3, second lens; 4, third lens; 5, transmission grating; 6, fourth lens; 7, fifth lens; 8, mirror device; 9, sixth lens; 10, seventh lens; 11, eighth lens; 12, detector. DETAILED DESCRIPTION

[0017] In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, the following will make detailed description to the specific implementation of the utility model with the drawings in the specification.

[0018] In the following description, many specific details are set forth in order to fully understand the utility model, but the utility model can also be implemented in other ways different from the description herein, and those skilled in the art can make similar generalization without departing from the connotation of the utility model, therefore, the utility model is not limited by the specific embodiments disclosed below.

[0019] Secondly, the "one embodiment" or "embodiment" referred to herein is intended to mean a specific feature, structure, or characteristic under at least one implementation of the utility model. The "in one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent or alternative to other embodiments.

[0020] Embodiment

[0021] Reference Figures 1-2 For the embodiment of the utility model, the embodiment provides a wide-spectrum and high-resolution Raman optical system, which comprises a slit 1, a first lens 2, a second lens 3 and a third lens 4 arranged on one side of the slit 1 respectively, a transmission grating 5 arranged on one side of the third lens 4, a fourth lens 6 and a fifth lens 7 arranged outside the transmission grating 5 respectively, a mirror device 8 arranged below the fifth lens 7, a sixth lens 9, a seventh lens 10 and an eighth lens 11 arranged on one side of the mirror device 8 respectively, and a detector 12 arranged outside the eighth lens 11.

[0022] Among them, the slit 1 is used to control the number and angle of light entering the spectrometer, screen the light to improve the measurement accuracy and accuracy, reduce the background of the spectrometer and remove the background signal, and improve the spectral resolution;

[0023] The first lens 2, the second lens 3 and the third lens 4 are used as a collimation group, which is used to collimate the light at the slit 1 into parallel light;

[0024] The parallel light is dispersed by the transmission grating 5 to obtain light of different wavebands;

[0025] The fourth lens 6, the fifth lens 7, the sixth lens 9, the seventh lens 10 and the eighth lens 11 are converging groups, which are used to converge light of different wavelengths on the detector 12;

[0026] The mirror device 8 is used to change the optical path by rotating to segment the light of different wavebands on the detector 12;

[0027] Through the combination of rotating the mirror device 8 and the transmission grating 5, a compact, small and low-cost spectral detection system is realized.

[0028] Specifically, the first lens 2, the second lens 3 and the third lens 4 are arranged from left to right in turn, and the first lens 2, the second lens 3 and the third lens 4 are distributed alternately.

[0029] Further, the fourth lens 6 and the fifth lens 7 are attached, and the attachment surface of the fourth lens 6 and the fifth lens 7 is fitted.

[0030] Preferably, the mirror device 8 is rotatable.

[0031] Further, the sixth lens 9, the seventh lens 10 and the eighth lens 11 are arranged from right to left in sequence, and the sixth lens 9, the seventh lens 10 and the eighth lens 11 are distributed at intervals.

[0032] Further, the detector 12 is used for receiving the converged light signal.

[0033] In use, by rotating the mirror device 8, the optical path can be changed, and part of the waveband can be imaged on the detector 12, and the detector and the positions of the lenses remain unchanged and are completely the same.

[0034] As shown in Figure 1 , the mirror device 8 (position one) images part of the waveband on the detector, and the detector 12 receives the previous signal.

[0035] As shown in Figure 2 , the mirror device 8 (position two) images the latter part of the waveband on the detector 12, and the detector 12 receives the latter signal. The mirror device 8 can image the signals on two rows of the image plane only by changing two positions, reduces the use of the detector, widens the spectral range, and improves the spectral resolution.

[0036] In summary, by rotating the mirror device 8, the optical path can be changed, and part of the waveband can be imaged on the detector 12, and the detector 12 and the positions of the lenses remain unchanged and are completely the same. Rotating the mirror device 8 multiple times can also image the spectrum on the detector 12. This can save the cost of multiple detectors 12 on the one hand, and can achieve the requirements of wide spectrum and high resolution on the other hand.

[0037] It is important to note that the construction and arrangements of the application shown in the various exemplary embodiments are illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications can be made to the embodiments without departing from the novel teachings and advantages of the subject matter described herein (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, locations, and the like). For example, the elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be modified or changed. Thus, all such modifications are intended to be included within the scope of the present inventive subject matter. The order or sequence of any process or method steps can be varied or re-sequenced without departing from the subject matter described herein. Any "open / closed" claims are intended to encompass the structure described herein, and not just the structure equivalent, but also the equivalent structure. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventive subject matter. Accordingly, the present inventive subject matter is not limited to particular embodiments described, but extends to various modifications that nevertheless fall within the scope of the appended claims.

[0038] Furthermore, in order to provide a concise description of the exemplary embodiments, not all features of an actual implementation can be described (i.e., those pertaining to the

[0039] It is understood that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions can be made. Such development efforts might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

[0040] It should be noted that the above-mentioned embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application, and although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalent replaced without departing from the spirit and scope of the present application, and all should be included in the scope of the claims of the present application.

Claims

1. A wide-spectrum, high-resolution Raman optical system, characterized by: The slit (1), the first lens (2), the second lens (3) and the third lens (4) arranged on one side of the slit (1) respectively, the transmission grating (5) arranged on one side of the third lens (4), the fourth lens (6) and the fifth lens (7) arranged on the outside of the transmission grating (5) respectively, the mirror device (8) arranged below the fifth lens (7), the sixth lens (9), the seventh lens (10) and the eighth lens (11) arranged on one side of the mirror device (8) respectively, and the detector (12) arranged on the outside of the eighth lens (11).

2. The wide-spectrum, high-resolution Raman optical system of claim 1, wherein: The first lens (2), the second lens (3) and the third lens (4) are arranged from left to right in sequence, and the first lens (2), the second lens (3) and the third lens (4) are distributed alternately.

3. The wide-spectrum, high-resolution Raman optical system of claim 2, wherein: The fourth lens (6) and the fifth lens (7) are attached, and the attachment surfaces of the fourth lens (6) and the fifth lens (7) are fitted.

4. The wide-spectrum, high-resolution Raman optical system of claim 3, wherein: The mirror device (8) is rotary.

5. The wide-spectrum, high-resolution Raman optical system of claim 4, wherein: The sixth lens (9), the seventh lens (10) and the eighth lens (11) are arranged from right to left in sequence, and the sixth lens (9), the seventh lens (10) and the eighth lens (11) are distributed alternately.

6. The wide-spectrum, high-resolution Raman optical system of claim 5, wherein: The detector (12) is used for receiving the converged light signal.

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