Dispersion structure and miniature Raman spectrometer

Abstract

The invention relates to the technical field of spectrum analyzers, in particular to a dispersion structure and a miniature Raman spectrometer, comprising an incident sleeve, a collimating mirror, a grating and a focus lens; an incident hole is formed in one end of the incident sleeve, and an emergent slit is formed in the other end of the incident sleeve; a plano-convex lens and a plano-convex cylindrical lens are sequentially fixed in the incident sleeve in the direction from the incident hole to the emergent slit; raman scattering light enters through the incidence hole and then is shaped into parallel light beams through the plano-convex lens, then the parallel light beams are shaped into linear light beams through the plano-convex cylindrical lens, and the length direction of the linear light beams is the same as the length direction of the exit slit; the linear light beam passes through the exit slit and then is reflected by the collimating mirror to become a parallel light beam, and the parallel light beam enters the focus lens after being dispersed by the grating and is converged by the focus lens to irradiate a detection unit. According to the invention, the light transmission efficiency of a light path can be improved, and the requirements of resolution and sensitivity can be met at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of spectroscopic analysis instruments, and particularly relates to a dispersion structure and a micro Raman spectrometer. Background Art

[0002] A Raman spectrometer is a precision instrument for obtaining chemical information of substances by detecting Raman spectra scattered by samples. Due to its compact optical structure, small size, and portability, a portable spectrometer is more conducive to the popularization and application of a micro Raman spectrometer. In addition to small size, a micro spectrometer for Raman light detection also has key indicators such as sensitivity, spectral detection range, and resolution of the spectrometer. Therefore, in the process of designing a Raman spectrometer, multiple factors need to be considered simultaneously to improve the performance of the spectrometer.

[0003] Since the probability of generating Raman scattering is low and the Raman light of substances is usually weak, a spectrometer with an unreasonable optical path design or low light transmission efficiency has low sensitivity, which ultimately affects the detected Raman spectra. Currently, a C-T type optical path structure is commonly used in micro Raman spectrometers, and the incident light of the entire system is obtained by an incident optical fiber passing through a slit. When the slit is too large, it will affect the resolution of the spectrometer, and if the slit is too small, it will affect the sensitivity of the system. Summary of the Invention

[0004] The purpose of the present invention is to provide a dispersion structure and a micro Raman spectrometer, which can improve the light transmission efficiency of the optical path and can simultaneously meet the requirements of resolution and sensitivity.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention discloses a dispersion structure, including an incident sleeve, a collimating mirror, a grating, and a focusing mirror; one end of the incident sleeve is provided with an incident hole, and the other end is provided with an exit slit; a plano-convex lens and a plano-convex cylindrical lens are sequentially fixed in the incident sleeve from the direction of the incident hole towards the exit slit; the plane part of the plano-convex lens faces the incident hole, and the convex part faces the plano-convex cylindrical lens; the convex surface of the plano-convex cylindrical lens faces the plano-convex lens, and the plane part faces the exit slit; the Raman scattered light enters through the incident hole and is shaped into a parallel beam by the plano-convex lens, and then shaped into a linear beam by the plano-convex cylindrical lens, and the length direction of the linear beam is the same as the length direction of the exit slit; the linear beam becomes a parallel beam after being reflected by the exit slit by the collimating mirror, is dispersed by the grating, and then is incident on the focusing mirror, and is converged by the focusing mirror and irradiated onto the detection unit.

[0006] Further, the collimating mirror, the grating, and the focusing mirror are respectively fixed on three mounting brackets, and the incident sleeve, the three mounting brackets, and the detection unit are all fixed on the housing.

[0007] Furthermore, a first mounting hole adapted to the collimating mirror, the grating or the focusing mirror is provided through the thickness direction of the mounting bracket. A first threaded hole adapted to the fastening stud is provided on the side surface of the mounting bracket. The fastening stud passes through the first threaded hole and abuts against the collimating mirror, the grating or the focusing mirror.

[0008] Furthermore, a position adjusting assembly is provided between the mounting bracket and the housing for adjusting the relative position between the mounting bracket and the housing.

[0009] Furthermore, the position adjusting assembly includes an adjusting stud and an adjusting nut. The adjusting stud is vertically fixed to the bottom surface of the housing. The adjusting nut is in threaded cooperation with the adjusting stud. A second mounting hole adapted to the adjusting stud is provided on the lower side of the mounting bracket. The lower side of the mounting bracket is in contact with the upper end of the adjusting nut.

[0010] Furthermore, the second mounting hole is a strip-shaped hole.

[0011] Furthermore, the position adjusting assembly includes two adjusting bolts and washers sleeved outside the adjusting bolts. The two adjusting bolts pass through two strip-shaped through holes on the bottom surface of the housing and are in mating connection with second threaded holes at the lower end of the mounting bracket. The washers are located between the lower end of the bracket and the housing.

[0012] Furthermore, the incident sleeve and the detection unit are fixed to the housing by a detachable connection method.

[0013] In a second aspect, the present invention discloses a micro Raman spectrometer, including a laser, an excitation unit, a detection unit, a signal processing unit, and the above-mentioned dispersion structure. The laser is used to emit a laser beam with a preset wavelength. The excitation unit is used to excite the laser beam emitted by the laser and then irradiate it onto the sample to be measured. The dispersion structure is used to collect the Raman scattered light signals generated after the laser beam irradiates the sample to be measured, and perform dispersion processing on the collected scattered light. The detection unit is used to perform photoelectric signal conversion on the signal output by the dispersion structure. The signal processing unit is used to analyze and process the signal output by the detection unit to form spectral data.

[0014] The present invention has the following unexpected beneficial effects: 1. The plano-convex lens of the dispersion structure according to the present invention reshapes the incident light into parallel light, and the plano-convex cylindrical lens further reshapes the parallel light into a linear light beam, and the linear light beam is consistent with the length direction of the exit slit. Therefore, more light can pass through the slit and enter the subsequent optical system, greatly improving the light passing efficiency of the optical path compared with the traditional structure. In practical application scenarios, such as when performing Raman spectroscopy detection on trace samples, the weak Raman scattered light can be processed by this structure, and more light signals can be effectively utilized, providing a sufficient light quantity basis for subsequent precise analysis.

[0015] 2. The exit slit described in the present invention plays a key role in restricting the width of the incident light in the entire dispersion structure. The slit width has a direct impact on the resolution of the spectrometer, and a suitable slit width setting can effectively improve the system resolution. In this dispersion structure, the linear light beam shaped by the plano-convex lens and the plano-convex cylindrical lens is adapted to the exit slit, making the light entering the subsequent spectroscopic system more regular and orderly. Thus, while meeting a certain light passing efficiency, it ensures that the spectrometer can obtain a high resolution, accurately distinguish light signals of different wavelengths, and meet the strict requirements for spectral resolution.

[0016] 3. The present invention performs shaping processing on the light through the plano-convex lens and the plano-convex cylindrical lens, increasing the amount of light entering the system, which helps to improve the sensitivity of the system. Because more light signals mean that stronger electrical signals can be generated during subsequent photoelectric conversion and signal processing, making them easier to detect and analyze. When detecting trace substances, the weak Raman signals can be more clearly detected after being optimized by this structure, improving the detection ability for low-concentration samples and meeting the requirements in terms of sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram of the dispersion structure provided by the embodiment of the present invention is shown.

[0018] Figure 2 The schematic diagram of the structure of the incident sleeve provided by the embodiment of the present invention is shown.

[0019] Figure 3 The schematic diagram of the connection between the dispersion structure and the housing provided by the embodiment of the present invention is shown.

[0020] Figure 4 The schematic diagram of a structure of an embodiment of the position adjustment component provided by the embodiment of the present invention is shown.

[0021] Figure 5 The schematic diagram of a structure of another embodiment of the position adjustment component provided by the embodiment of the present invention is shown.

[0022] Figure 6 The schematic diagram of the structure of the micro Raman spectrometer provided by the embodiment of the present invention is shown.

[0023] In the figure, 1 is an incident sleeve, 11 is an incident hole, 12 is an exit slit, 13 is a plano-convex lens, 14 is a plano-convex cylindrical lens, 15 is an external thread, 2 is a collimator, 3 is a grating, 4 is a focusing lens, 5 is a detection unit, 6 is a housing, 7 is a mounting bracket, 71 is a first mounting hole, 72 is a second mounting hole, 73 is a first threaded hole, 74 is a second threaded hole, 8 is a position adjustment assembly, 81 is an adjustment stud, 82 is an adjustment nut, 83 is an adjustment bolt, 84 is a gasket, 10 is a laser, 20 is an excitation unit, 30 is a signal processing unit, and 40 is a sample to be measured. Specific Embodiments

[0024] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for explaining the present invention and not for limiting the protection scope of the present invention.

[0025] It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention schematically. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the layout type of its components may also be more complex.

[0026] In one embodiment, the present invention discloses a dispersion structure. Refer to Figure 1 and Figure 2 As shown, the dispersion structure includes an incident sleeve 1, a collimator 2, a grating 3, and a focusing lens 4. One end of the incident sleeve 1 is provided with an incident hole 11, and the other end is provided with an exit slit 12. Inside the incident sleeve 1, a plano-convex lens 13 and a plano-convex cylindrical lens 14 are sequentially fixed from the incident hole 11 towards the exit slit 12. The flat surface portion of the plano-convex lens 13 faces the incident hole, and the convex surface portion faces the plano-convex cylindrical lens 14; the convex surface of the plano-convex cylindrical lens 14 faces the plano-convex lens 13, and the flat surface portion faces the exit slit 12.

[0027] During specific operation, Raman scattered light enters through the incident hole 11 and is shaped into a parallel beam by the plano-convex lens 13, and then shaped into a linear beam by the plano-convex cylindrical lens 14. The length direction of the linear beam is the same as the length direction of the exit slit 12; the linear beam becomes a parallel beam after being reflected by the collimator 2 through the exit slit 12, is dispersed by the grating 3, and then enters the focusing lens 4, and is converged by the focusing lens 4 and irradiated onto the detection unit 5.

[0028] The plano-convex lens 13 of the dispersion structure according to the present invention reshapes the incident light into parallel light, and the plano-convex cylindrical lens 14 further reshapes the parallel light into a linear light beam, and the linear light beam is consistent with the length direction of the exit slit 12. Furthermore, more light can pass through the slit and enter the subsequent optical system. Compared with the traditional structure, the light passing efficiency of the optical path is greatly improved. In actual application scenarios, such as when performing Raman spectroscopy detection on trace samples, the weak Raman scattered light can be processed by this structure, and more optical signals can be effectively utilized, providing a sufficient light quantity basis for subsequent precise analysis.

[0029] The exit slit 12 described in the present invention plays a key role in restricting the width of the incident light in the entire dispersion structure. The slit width has a direct impact on the resolution of the spectrometer. Appropriate slit width setting can effectively improve the system resolution. In this dispersion structure, the linear light beam shaped by the plano-convex lens 13 and the plano-convex cylindrical lens 14 is adapted to the exit slit 12, making the light entering the subsequent spectroscopic system more regular and orderly. Thus, while meeting a certain light passing efficiency, it ensures that the spectrometer can obtain a high resolution, accurately distinguish light signals of different wavelengths, and meets the strict requirements for spectral resolution.

[0030] The present invention performs shaping processing on light through the plano-convex lens 13 and the plano-convex cylindrical lens 14, increasing the amount of light entering the system, which helps to improve the sensitivity of the system. Because more optical signals mean that stronger electrical signals can be generated during subsequent photoelectric conversion and signal processing, making them easier to detect and analyze. When detecting trace substances, the weak Raman signals can be more clearly detected after being optimized by this structure, improving the detection ability for low-concentration samples and meeting the requirements in terms of sensitivity.

[0031] As a preferred embodiment of the present invention, as shown in Figure 3 the collimating mirror 2, the grating 3 and the focusing mirror 4 are respectively fixed on three mounting brackets 7, and the incident sleeve 1, the three mounting brackets 7 and the detection unit 5 are all fixed on the housing 6.

[0032] The setting of the mounting brackets 7 brings great convenience to the installation and debugging work. During the actual assembly process, technicians can separately install and finely adjust each optical element (the collimating mirror 2, the grating 3 or the focusing mirror 4) without being restricted by the fixed positions of other elements. For example, when installing the collimating mirror 2, its angle and position can be precisely adjusted according to the actual optical path requirements to ensure that its collimation effect on light reaches the best. After completing the debugging of the collimating mirror 2, the same operation is performed on the grating 3 and the focusing mirror 4. This way of debugging one by one can effectively improve the assembly accuracy and efficiency.

[0033] The incident sleeve 1, the three mounting brackets 7, and the detection unit 5 are all fixed on the housing 6, forming a stable overall structure. This integrated fixing method can effectively reduce the influence of external vibrations, impacts and other factors on the optical system. In actual application scenarios, such as in industrial production sites or field detection environments, the equipment may be subject to varying degrees of vibration interference. In this case, the components fixed on the housing 6 can maintain a relatively stable positional relationship, ensuring the stability of the optical path, and thus ensuring that the spectrometer can work continuously and accurately, improving the reliability of the system.

[0034] When a certain optical element fails or needs to be replaced, since it is fixed on an independent mounting bracket 7 and the connection methods of the components to the housing 6 are clear, maintenance personnel can easily find and disassemble the corresponding mounting bracket 7 to replace or repair the faulty element. This avoids the maintenance difficulties caused by the complex overall structure, greatly shortens the maintenance time, and reduces the maintenance cost. If the grating 3 is damaged, the maintenance personnel only need to remove the mounting bracket 7 fixing the grating 3 to replace the grating 3, without the need to perform large-scale disassembly and reassembly of the entire optical system.

[0035] As a preferred embodiment of the present invention, refer to Figures 3 to 5 As shown, a first mounting hole 71 adapted to the collimator 2, the grating 3 or the focusing lens 4 is provided through the thickness direction of the mounting bracket 7, and a first threaded hole 73 adapted to the fastening stud is provided on the side of the mounting bracket 7. The fastening stud passes through the first threaded hole 73 and abuts against the collimator 2, the grating 3 or the focusing lens 4.

[0036] The first mounting hole 71 of the mounting bracket 7 is adapted to the optical element (collimator 2, grating 3 or focusing lens 4), so that the optical element has an accurate position reference during installation, ensuring its position accuracy in the entire optical path system, avoiding installation deviation from affecting the optical path accuracy, and ensuring that the light can propagate along the designed path, providing a basis for high-resolution and high-sensitivity spectral detection.

[0037] A first threaded hole 73 adapted to the fastening stud is provided on the side of the mounting bracket 7, and the fastening stud passes through the first threaded hole 73 and abuts against the optical element, which provides a firm fixing method for the optical element. The fastening stud abuts against the optical element, which can effectively prevent the optical element from being displaced due to vibrations, collisions and other factors during use. When the spectrometer is actually working, whether in the conventional environment of the laboratory or in the industrial site or field environment where vibrations may exist, the optical element can remain stable, maintain the stability of the optical path, and ensure the reliability and repeatability of the measurement results.

[0038] And through the cooperation of the fastening stud and the first threaded hole 73, it is convenient to adjust the position of the optical element. During the debugging or use of the spectrometer, if it is necessary to finely adjust the position of the optical element to optimize the optical path, only need to rotate the fastening stud. By turning the fastening stud clockwise or counterclockwise, the abutting force and position of the fastening stud on the optical element can be changed, so as to realize the fine adjustment of the angle or position of the optical element, meet the fine requirements for the optical path under different sample detections or different experimental conditions, and improve the applicability and flexibility of the spectrometer.

[0039] As a preferred embodiment of the present invention, refer to Figure 4 and Figure 5 As shown, a position adjustment assembly 8 is provided between the mounting bracket 7 and the housing 6 for adjusting the relative position between the mounting bracket 7 and the housing 6.

[0040] During the use of the spectrometer, due to the characteristic differences of different samples or the change of experimental conditions, it may be necessary to finely adjust the optical path. The position adjustment assembly 8 provided between the mounting bracket 7 and the housing 6 can realize the fine adjustment of the mounting bracket 7 relative to the housing 6 in multiple dimensions. For example, when detecting samples with different concentrations or different types, the relative positions of optical elements such as the collimator 2, grating 3, and focusing mirror 4 can be flexibly changed through this assembly to optimize the light propagation path, so as to obtain clearer and more accurate spectral signals and improve the adaptability of the spectrometer to different detection requirements.

[0041] As the use time of the spectrometer increases, or due to factors such as vibration during transportation, the position of the optical element may have a slight deviation, affecting the detection accuracy of the instrument. The position adjustment assembly 8 provides convenience for the calibration of the instrument. During the calibration process, technicians can use this assembly to accurately adjust the position of the mounting bracket 7 to make the optical element return to the optimal working position, restore the high-precision detection ability of the instrument, ensure the reliability and accuracy of the measurement results, and extend the service life of the spectrometer.

[0042] During the research and development and improvement stage of the spectrometer, researchers can use the position adjustment assembly 8 to conduct various combination tests on the positions of the optical elements. By continuously adjusting the relative position between the mounting bracket 7 and the housing 6, observing the performance changes of the spectrometer, such as the fluctuations of indicators such as resolution and light transmission efficiency, the optimal optical element layout scheme can be found, further improving the overall performance of the spectrometer and promoting the continuous progress and development of spectrometer technology.

[0043] Furthermore, refer to Figure 4As shown, the position adjustment assembly 8 includes an adjustment stud 81 and an adjustment nut 82; the adjustment stud 71 is vertically fixed to the bottom surface of the housing 6, the adjustment nut 82 is in threaded cooperation with the adjustment stud 81, a second mounting hole 72 adapted to the adjustment stud 81 is provided on the lower side of the mounting bracket 7, and the lower side of the mounting bracket 7 is in contact and cooperation with the upper end of the adjustment nut 82.

[0044] The combined use of the adjustment stud 81 and the adjustment nut 82 can achieve precise fine adjustment of the position of the mounting bracket 7. By slowly rotating the adjustment nut 82, the mounting bracket 7 can be lifted and lowered on the adjustment stud 81 with a very small displacement. Since the spectrometer has extremely high requirements for the position accuracy of optical elements, this precise fine adjustment function is particularly important. For example, when calibrating the spectrometer, it may be necessary to adjust the position of the focusing mirror by a few micrometers. Through the fine control of the adjustment stud 81 and the adjustment nut 82, this accuracy requirement can be easily achieved, ensuring that the light can be accurately focused on the detection unit 5, and improving the resolution and detection accuracy of the spectrometer.

[0045] Preferably, the second mounting hole 72 is a slotted hole, which expands the adjustment range of the mounting bracket 7. Compared with a circular second mounting hole, the slotted hole allows the mounting bracket 7 to displace in a certain horizontal direction. This is very practical in actual applications. When multi-dimensional adjustment of the position of optical elements is required, in addition to vertical adjustment, the slotted hole can be used to achieve fine adjustment in the horizontal direction. For example, when adjusting the position of the grating 3 to optimize the light splitting effect, not only can the height be adjusted by the adjustment stud 81 and the adjustment nut 82, but also a slight movement can be made in the horizontal direction using the slotted hole to find the best light incident angle and position, thereby improving the light transmission efficiency and detection sensitivity of the spectrometer.

[0046] The structure of the position adjustment assembly 8 in this preferred embodiment is simple and easy to operate. When technicians adjust the position of the mounting bracket 7, they only need to use a simple tool (such as a wrench) to rotate the adjustment nut 82 to complete the vertical adjustment; for the horizontal adjustment, it can be achieved by moving the mounting bracket 8 within the range allowed by the slotted hole. This simple operation method reduces the difficulty of spectrometer maintenance and debugging and improves work efficiency.

[0047] Furthermore, referring to Figure 5 As shown, the position adjustment assembly 8 includes two adjustment bolts 83 and washers 84 sleeved outside the adjustment bolts 83. The two adjustment bolts 83 pass through two slotted through-holes on the bottom surface of the housing 6 and are in mating connection with second threaded holes 74 at the lower end of the mounting bracket 7. The washers 84 are located between the lower end of the bracket 7 and the housing 6.

[0048] Two adjusting bolts 84 cooperate with the strip-shaped through holes on the bottom surface of the housing 6, realizing the flexible adjustment of the mounting bracket 7 in the horizontal and vertical directions. In the horizontal direction, due to the design of the strip-shaped through holes, the mounting bracket 7 can move within a small range along the length direction of the through holes, which is crucial for fine-tuning the lateral position of the optical elements when calibrating the optical path. For example, when it is necessary to precisely adjust the horizontal positions of the collimating mirror 2, the grating, or the focusing mirror 5 so that the light passes through each optical element accurately, the connection between the adjusting bolt 83 and the second threaded hole 74 can be loosened, the mounting bracket 7 can be moved, and then the adjusting bolt 83 can be tightened to achieve this. In the vertical direction, by using shims 84 with different heights, the height of the mounting bracket 7 can be changed, thereby adjusting the position of the optical elements in the vertical direction to meet different optical path requirements, greatly improving the adaptability of the spectrometer to various experimental conditions and sample detections.

[0049] As a preferred embodiment of the present invention, the incident sleeve 1 and the detection unit 5 are fixed to the housing 6 by a detachable connection method.

[0050] During the long-term use of the Raman spectrometer, the incident sleeve 1 and the detection unit 5 are more likely to malfunction or experience performance degradation due to direct contact with the Raman scattered light of the sample or factors such as the aging of internal electronic components. By using a detachable connection method, maintenance personnel can quickly and conveniently disassemble them from the housing 6 for separate inspection, cleaning, or replacement of parts. For example, when the optical elements in the incident sleeve 1 are contaminated and affect the light transmission efficiency, it can be easily disassembled for cleaning or replacement; if the photosensitive components of the detection unit 5 are damaged, they can also be replaced in a timely manner, avoiding long-term downtime of the equipment due to difficult maintenance, effectively reducing the maintenance cost and time cost, and improving the usability of the equipment.

[0051] With the continuous development of optical technology and detector technology, in order to improve the performance of the Raman spectrometer, it may be necessary to upgrade the incident sleeve 1 or the detection unit 5. The detachable connection method makes this upgrade simple and easy. Researchers or equipment managers can conveniently install a more advanced incident sleeve 1 or detection unit 5 onto the existing housing 6 according to the latest technological developments and actual needs. For example, a new detection unit has higher sensitivity or a wider spectral response range. By replacing the detection unit, the spectrometer can be equipped with more powerful detection capabilities, extending the service life of the spectrometer and enabling it to adapt to the ever-changing scientific research and detection needs.

[0052] When the spectrometer needs to be transported or stored for a long time, the detachable connection method can reduce the risk of equipment damage. Since the incident sleeve 1 and the detection unit 5 are relatively precise components, they are easily affected by vibrations, collisions, etc. during transportation. By detaching them from the housing, they can be more properly packaged and protected separately. For example, they can be wrapped with special cushioning materials and then placed in different protective boxes respectively to reduce damage caused by mutual collision or friction with other objects during transportation. During storage, the space can also be arranged more reasonably to avoid deformation or damage of the components caused by long-term extrusion, ensuring that the equipment can still maintain good performance after transportation and storage.

[0053] Exemplarily, referring to Figure 2 As shown, an external thread is provided on the outer side of the end of the incident sleeve 1 close to the incident hole 11, and an internal thread adapted to the external thread is provided on the through hole of the housing 6 for fixing the incident sleeve 1, so as to achieve a detachable connection between the incident sleeve 1 and the housing 6. The incident sleeve 1 and the housing 6 are connected by screwing the external thread and the internal thread together, and the operation process is simple and direct. During installation, only need to align the external thread at the end of the incident sleeve 1 with the internal thread on the through hole of the housing 6, and then rotate the incident sleeve 1 to easily achieve a tight connection between the two; during disassembly, rotate the incident sleeve 1 in the reverse direction to remove it from the housing 6. This operation method does not require the aid of complex tools or professional skills, reduces the difficulty of installation and maintenance, and improves work efficiency. For example, in a laboratory environment, when researchers need to replace the optical elements inside the incident sleeve, they can quickly complete the disassembly and installation operations, reducing the equipment downtime.

[0054] Moreover, the threaded connection can provide a stable and reliable fixing effect. The tight fit between the external thread and the internal thread can effectively prevent the incident sleeve 1 from loosening, displacing, etc. during use. Even if the spectrometer may be subject to a certain degree of vibration or external force during operation, the threaded connection structure can ensure that the incident sleeve always remains in the correct position, maintaining the stability of the optical path, and thus ensuring that the spectrometer can accurately collect and analyze Raman scattering light signals and obtain reliable detection results.

[0055] Exemplarily, a screw is installed between the detection unit 5 and the housing 6 to achieve a detachable connection. During assembly, the mounting screw passes through the through hole on the housing 6 and is in fit connection with the threaded mounting hole preset on the detection unit 5.

[0056] Connection is made using installation screws, and the operation process is relatively intuitive and convenient. During assembly, simply pass the installation screws through the through holes on the housing 6 and then screw them tightly into the pre-set threaded installation holes on the detection unit 5, without the need for complex operation steps or special tools. When it is necessary to disassemble the detection unit 5 for maintenance, replacement, or upgrade, reverse-rotating the screws can easily separate it from the housing 7. This greatly saves the time for equipment maintenance and debugging, improves work efficiency, and even non-professional technicians can operate it proficiently after simple training.

[0057] Screw connection can provide reliable fastening force to ensure that the detection unit 5 is firmly installed on the housing 6 during use. When the spectrometer is working, it may be affected by external factors such as vibration and shaking. The tight fit of the installation screws can effectively prevent the detection unit from shifting or loosening, ensuring that the detection unit is always in the best working position, maintaining the stability of the optical path system, so as to ensure that the spectrometer can accurately convert the optical signal into an electrical signal, obtain accurate spectral data, and improve the reliability and repeatability of the measurement results.

[0058] In one embodiment, referring to Figure 6 As shown, the present invention also discloses a micro Raman spectrometer, which includes a laser 10, an excitation unit 20, a detection unit 5, a signal processing unit 30, and the dispersion structure described in any of the above embodiments; the laser 10 is used to emit a laser beam with a preset wavelength; the excitation unit 20 is used to excite the laser beam emitted by the laser 10 and then irradiate it onto the sample to be measured 40; the dispersion structure is used to collect the Raman scattered light signal generated after the laser beam irradiates the sample to be measured 40, and perform dispersion processing on the collected scattered light; the detection unit 5 is used to convert the signal output by the dispersion structure into an optoelectronic signal; the signal processing unit 30 is used to analyze and process the signal output by the detection unit 5 to form spectral data.

[0059] The micro Raman spectrometer described in this embodiment integrates multiple key components such as the laser 10, the excitation unit 20, the detection unit 5, the signal processing unit 30, and the dispersion structure. This highly integrated design enables the instrument to achieve a complete functional process from laser emission, sample excitation, collection and dispersion processing of Raman scattered light, optoelectronic signal conversion to final spectral data analysis and processing in a compact space. Compared with traditional split-type spectroscopic analysis equipment, the volume and weight of the instrument are greatly reduced, the portability of the equipment is improved, and it is more suitable for use in scenarios such as on-site detection and field operations. For example, in the fields of on-site detection of cultural relics and rapid screening of environmental pollutants, scientific researchers can easily carry this micro Raman spectrometer to the detection site and obtain the spectral information of the sample in a timely manner.

[0060] The optimized design of the dispersion structure plays a crucial role in improving the detection accuracy and sensitivity. The dispersion structure collects and disperses the Raman scattered light signal. Its special combination of optical elements (such as plano-convex lens 13, plano-convex cylindrical lens 14, etc.) can improve the light passing efficiency of the optical path, allowing more Raman scattered light to enter the subsequent detection unit. At the same time, while meeting the resolution requirements, it ensures sufficient light intensity for photoelectric signal conversion. This means that even weak Raman scattered light signals can be effectively detected and analyzed, thereby improving the detection ability for low-concentration samples or trace substances and making the detection results more accurate and reliable.

[0061] The functional units of the micro-Raman spectrometer described in the present invention cooperate closely with each other to form an efficient and coherent detection process. The preset wavelength laser beam emitted by the laser 10 is irradiated onto the sample to be measured 40 through the excitation unit 20. The generated Raman scattered light is quickly collected and processed by the dispersion structure, and then the detection unit 5 promptly converts the dispersed optical signal into an electrical signal. Finally, the signal processing unit 30 quickly analyzes and processes the electrical signal to form spectral data. This integrated design reduces the loss and interference during signal transmission, improves the detection efficiency, can obtain accurate detection results in a short time, and meets the requirements of real-time detection and rapid analysis.

[0062] Moreover, due to the adoption of the modular design concept, each functional unit is relatively independent and works collaboratively. This makes the micro-Raman spectrometer highly scalable and adaptable. In practical applications, according to different detection requirements and application scenarios, each functional unit can be flexibly replaced or upgraded. For example, when it is necessary to detect the Raman spectrum in a specific wavelength range, the detection unit 5 with different spectral response ranges can be replaced; if higher requirements are placed on the detection accuracy, the algorithms and hardware of the signal processing unit 30 can be upgraded to meet diverse scientific research and detection needs.

[0063] The above embodiments are only preferred embodiments given to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are all within the protection scope of the present invention.

Claims

1. A dispersion structure, characterized in that: It includes an incident sleeve (1), a collimating mirror (2), a grating (3), and a focusing mirror (4); One end of the incident sleeve (1) is provided with an incident hole (11), and the other end is provided with an exit slit (12); Inside the incident sleeve (1), a plano-convex lens (13) and a plano-convex cylindrical lens (14) are sequentially fixed in the direction from the incident hole (11) towards the exit slit (12); the plane part of the plano-convex lens (13) faces the incident hole (11), and the convex part faces the plano-convex cylindrical lens (14); the convex surface of the plano-convex cylindrical lens (14) faces the plano-convex lens (13), and the plane part faces the exit slit (12); The Raman scattering light enters through the incident hole (11) and is shaped into a parallel beam by the plano-convex lens (13), and then shaped into a linear beam by the plano-convex cylindrical lens (14). The length direction of the linear beam is the same as the length direction of the exit slit (12); After passing through the exit slit (12), the linear beam is reflected by the collimating mirror (2) to become a parallel beam, dispersed by the grating (3), and then incident on the focusing mirror (4), and is converged by the focusing mirror (4) to irradiate the detection unit (5).

2. The dispersion structure according to claim 1, wherein: The collimating mirror (2), the grating (3), and the focusing mirror (4) are respectively fixed on three mounting brackets (7), and the incident sleeve (1), the three mounting brackets (7), and the detection unit (5) are all fixed on the housing (6).

3. The dispersion structure according to claim 2, wherein: A first mounting hole (71) adapted to the collimating mirror (2), the grating (3), or the focusing mirror (4) is provided through the thickness direction of the mounting bracket (7). A first threaded hole (73) adapted to the fastening stud is provided on the side surface of the mounting bracket (7). The fastening stud passes through the first threaded hole (73) and abuts against the collimating mirror (2), the grating (3), or the focusing mirror (4) for cooperation.

4. The dispersion structure according to claim 2, wherein: A position adjusting assembly (8) is provided between the mounting bracket (7) and the housing (6) for adjusting the relative position between the mounting bracket (7) and the housing (6).

5. The dispersion structure according to claim 4, wherein: The position adjusting assembly (8) includes an adjusting stud (81) and an adjusting nut (82); the adjusting stud (81) is vertically fixed to the bottom surface of the housing (6), the adjusting nut (82) is in threaded cooperation with the adjusting stud (81), and a second mounting hole (72) adapted to the adjusting stud (81) is provided on the lower side of the mounting bracket (7). The lower side of the mounting bracket (7) is in contact and cooperation with the upper end of the adjusting nut (82).

6. The dispersion structure according to claim 5, wherein: The second mounting hole (72) is a strip-shaped hole.

7. The dispersion structure according to claim 4, characterized in that: The position adjusting assembly (8) includes two adjusting bolts (83) and a gasket (84) sleeved outside the adjusting bolts (83). The two adjusting bolts (83) pass through two strip-shaped through holes on the bottom surface of the housing (6) and are connected in cooperation with the second threaded holes (74) at the lower end of the mounting bracket (7). The gasket (84) is located between the lower end of the bracket (7) and the housing (6).

8. The dispersion structure according to claim 2, characterized in that: The incident sleeve (1) and the detection unit (5) are fixed to the housing (6) by a detachable connection method.

9. A micro Raman spectrometer, characterized in that: It includes a laser (10), an excitation unit (20), a detection unit (5), a signal processing unit (30), and a dispersion structure as described in any one of claims 1 to 8; The laser (10) is configured to emit a laser beam with a preset wavelength; The excitation unit (20) is configured to excite the laser beam emitted by the laser (10) and then irradiate it onto the sample to be measured (40); The dispersion structure is configured to collect the Raman scattered light signal generated after the laser beam irradiates the sample to be measured (40), and perform dispersion processing on the collected scattered light; The detection unit (5) is configured to perform photoelectric signal conversion on the signal output by the dispersion structure; The signal processing unit (30) is configured to analyze and process the signal output by the detection unit (5) to form spectral data.

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