Portable transmission spectrum acquisition device

Abstract

The invention relates to a portable transmission spectrum acquisition device which comprises a spectrum acquisition module, a light source module, a positioning module and a shell, the spectrum acquisition module comprises a spectrum acquisition platform, a shading table, an inner shell, a guide slide rail, a spectrometer and a collimating lens; the positioning module comprises a positioning support, a reset spring and a positioning taper pin. The light source module comprises a light distance adjusting gear, a limiting bolt, a light source support, a linear bearing, a condensation light source and an auxiliary positioning rod. The device has the characteristics of compact structure, collaborative design of modules, high positioning precision, flexible light source adjustment, portability and the like, is suitable for real-time transmission spectrum acquisition of different types of samples in multiple scenes, and can be widely applied to qualitative and quantitative analysis of internal components of the samples.

Description

Technical Field

[0001] This invention relates to the field of spectroscopic detection technology, and in particular to a portable transmission spectroscopy acquisition device for real-time acquisition of transmission spectra of multi-phase samples, suitable for qualitative and quantitative analysis of material composition. Background Technology

[0002] Transmission spectroscopy is an analytical method based on the principle of light-matter interaction, widely used in food safety testing, pharmaceutical quality control, biological sample analysis, and materials science research. By analyzing the transmission characteristics of a sample to incident light of different wavelengths, qualitative and quantitative detection of its internal components can be achieved.

[0003] While diffuse reflectance and diffuse transmission spectroscopy, which are currently widely used, have certain advantages in obtaining signal intensity, the incident light is mainly reflected at the sample surface or has a short propagation path inside the sample. Therefore, the spectral information obtained mainly reflects the surface or near-surface features of the sample and is difficult to effectively resolve the overall information of samples with uneven internal composition.

[0004] Existing transmission spectroscopy acquisition devices are mostly fixed structures, using cuvettes to load samples, and are mainly suitable for the analysis of liquid samples. However, transmission acquisition of solid or semi-solid samples is more susceptible to interference from factors such as light source offset, sample shaking, and stray light. These devices generally suffer from the following technical bottlenecks: First, the position between the light source and the sample is not adjustable, making it difficult to optimize measurement conditions for samples of different thicknesses or shapes; second, the sample fixation method is unstable, resulting in poor repeatability; third, the structural design lacks versatility, making it difficult to be compatible with liquid, solid, semi-solid, or high-viscosity samples; fourth, some devices are complex in design and have high manufacturing costs, limiting their widespread application in portable detection, teaching experiments, or small-to-medium-sized experimental scenarios. In the prior art, patent application CN 111665221A discloses a device for detecting seed vigor based on transmission spectroscopy. This device achieves the function of fixing the material by processing multiple through holes in the opaque plates on the front and back sides to clamp the seeds. It uses a supercontinuum laser to emit a collimated pulse broadband beam, and uses a pinhole aperture to intercept the central part of the pulse broadband beam to form a first beam to illuminate the sample. However, the technical solution still has the following problems: (1) This method is only suitable for clamping particles with relatively regular shapes. If the material being clamped is irregular in shape, light will leak out from the gap between the material and the clamping plate, affecting the measurement accuracy; (2) This solution is only suitable for collecting transmission spectrum information of solid objects; (3) Fixing the material with nuts is time-consuming and labor-intensive; (4) This device does not consider the influence of the distance between the light source and the material on the acquisition results.

[0005] Patent application CN107389559A discloses a method for measuring the composition of a complex solution in a bag using multi-position transmission spectroscopy. This method uses a packaging bag to load the liquid material and utilizes light sources and spectral receiving devices distributed on both sides of the packaging bag to achieve the transmission spectral acquisition function of the complex solution. However, this technical solution still has the following problems: (1) Using flexible materials to load the sample will cause the effective optical path to change randomly each time the sample is loaded due to deformation caused by sample density, loading method, and material fatigue. According to Beer-Lambert's law, the optical path and light intensity are significantly negatively correlated in the solution, so random changes in the optical path will lead to random errors. (2) Using a measuring bag to load the liquid sample makes it difficult to avoid the influence of stray light on the detection results; (3) This solution is only suitable for the acquisition of transmission spectral information of liquid objects.

[0006] Therefore, there is an urgent need to develop a portable transmission spectroscopy acquisition device that is compact, precisely positioned, has an adjustable distance between the light source and the sample, is highly adaptable, and has low manufacturing costs, in order to improve the measurement efficiency and accuracy of spectral data for different types of samples and meet the diverse needs of spectral analysis in various scenarios. Summary of the Invention

[0007] To address the problems of inaccurate sample positioning, fixed distance between the light source and the sample, limited compatibility with different sample types, and complex, bulky, and inconvenient equipment structure in existing transmission spectroscopy acquisition devices, the present invention aims to provide a portable transmission spectroscopy acquisition device suitable for real-time acquisition of the transmission spectral characteristics of samples, facilitating rapid detection and analysis of the internal components of samples.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A portable transmission spectrum acquisition device includes a spectrum acquisition module, a light source module, a positioning module, and a housing.

[0010] The housing includes an upper cover and a main housing; the upper cover is detachably disposed on the top of the main housing; the front opening of the main housing is used for the spectral acquisition module to enter and exit.

[0011] The spectral acquisition module includes a spectral acquisition platform, a light-shielding stage, an inner shell, a guide rail, a spectrometer, and a collimating lens.

[0012] A pair of guide rails are fixed to the inner surface of the bottom plate of the main housing; the bottom end of the inner housing is fixed to the slider of the guide rail, allowing it to enter / exit from the front opening of the main housing along the guide rail; the spectrometer is fixedly installed in the inner housing, and the collimating lens is installed on the acquisition port at the top of the spectrometer; the spectral acquisition platform is detachably installed on the top of the inner housing, and the lower end face of the spectral acquisition platform is provided with a positioning protrusion ring for accommodating the collimating lens, and the upper end face of the spectral acquisition platform is provided with a sample groove corresponding to the collimating lens for placing the sample to be tested; the central axis of the sample groove is coaxial with the optical axis of the collimating lens.

[0013] The positioning module includes a positioning bracket, a return spring, and a positioning conical pin. The positioning bracket is fixed to the bottom plate and rear wall of the main housing. The positioning conical pin is vertically inserted into the positioning bracket, and the return spring is sleeved on the outside of the positioning conical pin and secured between the positioning bracket and the conical head retaining ring. The conical head of the positioning conical pin engages with the positioning hole at the rear end of the bottom plate of the inner housing to position the inner housing. After the sample is loaded, the conical pin is pulled and the inner housing is pushed back to the predetermined position of the main housing. When the spectral acquisition platform is reset, the positioning conical pin automatically inserts into the positioning hole under the action of the return spring, achieving precise positioning and fixation of the sample.

[0014] The light source module is positioned above the spectral acquisition module; the light source module includes a light distance adjustment gear, a limiting bolt, a light source bracket, a linear bearing, a focusing light source, and an auxiliary positioning rod.

[0015] The top ends of the limiting bolt and the auxiliary positioning rod are fixed to the upper cover, and the limiting bolt and the auxiliary positioning rod are at a certain angle; the limiting bolt passes through the middle of the horizontally set light source bracket and is threadedly connected to the optical distance adjustment gear set inside the light source bracket; the auxiliary positioning rod is set in the linear bearing, and the linear bearing is fixed to the light source bracket; two sets of focused light sources are symmetrically installed on the left and right sides of the light source bracket, and the illumination center axis of the two sets of focused light sources coincides with the center axis of the sample groove of the spectral acquisition platform, that is, the two sets of focused light sources are symmetrically distributed with the center axis of the sample groove of the spectral acquisition platform as the axis.

[0016] The spectrometer is fixed by a rotating positioning handle that is screwed in from the front end of the inner housing. The end of the rotating positioning handle that contacts the spectrometer is provided with a protective sleeve.

[0017] Different spectral characteristics can be acquired by replacing spectrometers with different bands.

[0018] Cooling fans are provided on the left and right sides of the inner casing.

[0019] By replacing the spectral acquisition platform with different groove shapes, it can be adapted to samples of different sizes or shapes, achieving diversity compatibility.

[0020] The spectral acquisition platform has a light-shielding stage around the sample groove to absorb ambient stray light and reduce the influence of interference light on the spectral acquisition results.

[0021] Each group of focused light sources is equipped with a focused cup structure.

[0022] The focused light source is covered with a black light-absorbing material.

[0023] When the light distance adjustment gear is rotated, the light source bracket moves up and down along the direction of the limit bolt to adjust the height of the light source. The adjustment range of the distance between the light source and the material is 0~30 mm.

[0024] The auxiliary positioning rod and the limiting bolt are arranged at a 45° angle.

[0025] Traditional transmission spectroscopy devices primarily improve stability through data algorithm optimization. This device, however, for the first time addresses mechanical structural stability by employing a self-resetting conical pin positioning structure in conjunction with a restricted lifting path design. This minimizes sample repositioning errors and optical axis misalignment errors, resulting in a transmission spectrum variation coefficient for irregular solid samples consistently below 5%. This structural combination is not a simple replacement of existing mechanical structures, but rather a structural-functional coupling design specifically addressing the sensitivity of transmission spectroscopy systems to optical axis stability.

[0026] The positioning module of this device adopts a combination design of conical pin and return spring. Through automatic reset of the pin and guidance of the conical surface, it achieves high coaxiality automatic positioning. This structure has the advantages of compact structure, strong wear self-compensation capability, and good repeatability. It is a highly stable positioning mechanism designed for the precise and repeated placement of solid samples.

[0027] The light source module innovatively employs a gear-thread lifting mechanism combined with a 45° limiting structure, achieving stable, continuous, and fine-tuned vertical displacement control of the light source within a limited space. This structure, through the angular coordination of linear bearings and auxiliary positioning rods, mechanically restricts and positions the lifting path of the light source module, preventing offset and rotation. This is an innovative structural approach suitable for ensuring the stability of optical systems.

[0028] The device stabilizes the coefficient of variation of the transmission spectral characteristics of irregularly shaped solid samples within 5% by using the vertically stable, continuous, and fine-tuned light source displacement control provided by the light source module and the high coaxiality automatic positioning provided by the positioning module.

[0029] This invention features a compact structure and high functional integration. Its modular design meets the real-time acquisition requirements of transmission spectra for different samples. Compared with existing technologies, the advantages of this invention are:

[0030] 1. Precise sampling and positioning: The conical pin positioning structure ensures that the sample is centered in the optical path, improving repeatability;

[0031] 2. Flexible light source adjustment: The height of the light source can be adjusted via a gear-thread mechanism to accommodate samples of different thicknesses;

[0032] 3. Strong compatibility: The acquisition platform is replaceable and adaptable to various sample forms such as liquid, solid, and semi-solid;

[0033] 4. Portable and easy to operate: The device has a compact structure with overall dimensions of only 177×86×70mm. It is lightweight, weighing approximately 510g, making it suitable for rapid on-site testing or teaching demonstrations;

[0034] 5. Improved data quality: The light-shielding and optical path collimation design ensures signal stability and measurement accuracy;

[0035] 6. Low cost and easy to promote: The device has a simple structure, low manufacturing cost, and is easy to mass-produce and widely apply. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of the portable transmission spectroscopy acquisition device of the present invention;

[0037] Figure 2 This is a cross-sectional view of the internal structure of the portable transmission spectroscopy acquisition device of the present invention;

[0038] Figure 3 This is a schematic diagram of the internal structure of the light source module of the present invention.

[0039] The attached figures are labeled as follows: 1. Housing; 101. Top cover; 102. Main housing; 2. Light source module; 201. Optical distance adjustment gear; 202. Limiting bolt; 203. Light source bracket; 204. Linear bearing; 205. Auxiliary positioning rod; 206. Focusing light source; 3. Spectrum acquisition module; 301. Spectrum acquisition platform; 302. Inner housing; 303. Positioning handle; 304. Guide rail; 305. Light shield; 306. Protective cover; 307. Spectrometer; 308. Collimating lens; 309. Cooling fan; 4. Positioning module; 401. Positioning bracket; 402. Return spring; 403. Positioning conical pin. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] like Figure 1 and Figure 2 As shown, a portable transmission spectrum acquisition device includes a spectrum acquisition module 3, a light source module 2, a positioning module 4, and a housing 1.

[0042] The housing 1 includes an upper cover 101 and a main housing 102, which support and protect the entire structural assembly, while facilitating carrying and maintenance. The upper cover 101 is detachably mounted on the top of the main housing 102; the front opening of the main housing 102 allows the spectral acquisition module 3 to enter and exit.

[0043] The spectral acquisition module 3 includes a spectral acquisition platform 301, a light-shielding stage 305, an inner shell 302, a positioning handle 303, a protective cover 306, a guide rail 304, a cooling fan 309, a spectrometer 307, and a collimating lens 308.

[0044] A pair of guide rails 304 are fixed to the inner surface of the base plate of the main housing 102; the bottom end of the inner housing 302 is fixed to the slider of the guide rails 304, allowing it to enter / exit from the front opening of the main housing 102 along the guide rails 304; the spectrometer 307 is housed in the inner housing 302 and is fixed by a rotating positioning handle 303 screwed into the front face of the inner housing 302. Different spectral characteristics can be acquired by replacing the spectrometer 307 with different bands. Preferably, the end of the rotating positioning handle 303 that contacts the spectrometer 307 is provided with a protective sleeve 306 to prevent damage to the instrument due to excessive rotation. Cooling fans 309 are provided on the left and right sides of the inner housing 302 to provide ventilation and heat dissipation for the spectrometer 307, ensuring its operation at a stable temperature. The collimating lens 308 is mounted on the acquisition port at the top of the spectrometer 307 to convert the divergent light transmitted from the sample into parallel light, improving the signal-to-noise ratio and resolution. The spectral acquisition platform 301 is detachably mounted on the top of the inner housing 302. The lower end face of the spectral acquisition platform 301 is provided with a positioning protrusion ring for accommodating the collimating lens 308, and the upper end face of the spectral acquisition platform 301 is provided with a sample groove corresponding to the collimating lens 308 for placing the sample to be tested. The central axis of the sample groove is coaxial with the optical axis of the collimating lens 308. By replacing the spectral acquisition platform 301 with different groove shapes, samples of different sizes or shapes can be adapted, achieving versatility compatibility. When the operator pulls the rotating positioning handle 303 horizontally outward, the inner housing 302 and the spectral acquisition platform 301 on it are moved along the guide rail 304, thereby pulling the spectral acquisition platform 301 out of the main housing 102 for sample placement. A light-shielding stage 305 is provided around the sample groove of the spectral acquisition platform 301. The light-shielding stage 305 is entirely black and is used to absorb ambient stray light, reducing the influence of interference light on the spectral acquisition results.

[0045] like Figure 2As shown, the positioning module 4 includes a positioning bracket 401, a return spring 402, and a positioning conical pin 403. The positioning bracket 401 is fixed to the bottom plate and rear wall of the main housing 102; the positioning conical pin 403 is vertically inserted into the positioning bracket 401, and the return spring 402 is sleeved on the outside of the positioning conical pin 403, and is secured between the positioning bracket 401 and the conical head retaining ring; the conical head of the positioning conical pin 403 engages with the positioning hole at the rear end of the bottom plate of the inner housing 302 to position the inner housing 302. After the sample is loaded, the conical pin 403 is pulled and the inner housing 302 is pushed back to the predetermined position of the main housing 102. When the spectral acquisition platform 301 is reset, the positioning conical pin 403 automatically inserts into the positioning hole under the action of the return spring 402, realizing the precise positioning and fixation of the sample. Even with some wear during use, the positioning conical pin 403 and the positioning hole can still maintain a high degree of coaxiality, thereby ensuring that the sample is in the center of the optical path and improving the stability of the acquisition.

[0046] The light source module 2 is positioned above the spectrum acquisition module 3. For example... Figure 3 As shown, the light source module 2 includes a light distance adjustment gear 201, a limiting bolt 202, a light source bracket 203, a linear bearing 204, a focusing light source 206, and an auxiliary positioning rod 205.

[0047] The top ends of the limiting bolt 202 and the auxiliary positioning rod 205 are fixed to the upper cover 101, and the limiting bolt 202 and the auxiliary positioning rod 205 are at a certain angle. The limiting bolt 202 passes through the middle of the horizontally set light source bracket 203 and is threadedly connected to the light distance adjustment gear 201 set inside the light source bracket 203. The auxiliary positioning rod 205 is set inside the linear bearing 204, and the linear bearing 204 is fixed to the light source bracket 203. Two sets of focusing light sources 206 are symmetrically installed on the left and right sides of the light source bracket 203. The illumination center axis of the two sets of focusing light sources 206 coincides with the center axis of the sample groove of the spectral acquisition platform 301. That is, the two sets of focusing light sources 206 are symmetrically distributed with the center axis of the sample groove of the spectral acquisition platform 301 as the axis, ensuring the uniformity of sample illumination. Each set of focusing light sources 206 is equipped with a focusing cup structure to effectively collect and focus the divergent light, thereby improving the illumination efficiency and utilization rate of the light source. To suppress stray light interference, the focusing light source 206 is externally coated with a black light-absorbing material, which significantly reduces the impact of ambient scattered light on signal acquisition, allowing only light containing effective sample transmission information to enter the spectrometer, further improving the signal-to-noise ratio and accuracy of the spectral data. When the optical distance adjustment gear 201 is rotated, the light source support 203 can move up and down along the direction of the limiting bolt 202 to adjust the height of the light source. The adjustment range of the distance between the light source and the material is 0~30 mm. The linear bearing 204 on the support works in conjunction with the auxiliary positioning rod 205 to effectively restrict the rotational freedom of the support, allowing it to only move up and down in the vertical direction.

[0048] Preferably, the auxiliary positioning rod 205 and the limiting bolt 202 are arranged at a 45° angle. The triangular stabilizing structure is used to fix the light source module. When the angle between the auxiliary positioning rod 205 and the limiting bolt 202 is 45°, the ratio of normal force to axial force is balanced. This prevents the light source module from becoming too loose due to insufficient normal force, and also prevents excessive radial pressure from causing difficulties in assembly and vertical movement of the light source. The geometric structure stabilizes the movement trajectory of the light source module 2, improving adjustment accuracy.

[0049] The working process of this invention is as follows:

[0050] In use, first pull the positioning handle 303, causing the positioning cone pin 403 to overcome the elastic force of the return spring 402 under external force and disengage from the positioning bracket 401. At this time, the spectral acquisition platform 301 loses its axial locking constraint and can slide smoothly out along the guide rail 304.

[0051] After placing the solid material to be tested at the designated position on the spectral acquisition platform 301, pull the positioning conical pin 403 vertically upwards to reset the spectral acquisition platform 301 to the initial detection position along the guide rail 304. After releasing the external force, under the elastic recovery action of the return spring 402, the positioning conical pin 403 automatically inserts into the conical positioning hole of the positioning bracket 401, achieving automatic guidance and self-locking, thereby completing the high coaxiality fixation of the spectral acquisition platform 301.

[0052] Subsequently, the focusing light source 206 is turned on. After the light is transmitted through the material, it is shaped by the collimating lens 308 and enters the spectrometer 307 for signal acquisition.

[0053] Depending on the material size and transmission characteristics, loosen the locking nut on the limiting bolt 202, rotate the optical distance adjusting gear 201, and use the gear-thread lifting mechanism to continuously fine-tune the light source module in the vertical direction, thereby changing the distance between the light source and the material. After adjusting to the appropriate optical path, re-tighten the nut on the limiting bolt 202 to fix the position of the light source.

[0054] After the concentrated light source 206 has been preheated and stabilized (preferably 30 minutes), start the spectrometer 307 to collect transmission spectrum data.

[0055] This invention integrates the needs for collecting transmission spectral characteristics of different types of samples into a single device by using a conical pin for positioning and a gear-adjustable threaded lifting light source module 2. Within a certain wear range, the conical pin and the positioning hole on the inner housing 302 always remain on the same axis, ensuring the accuracy of the sample position, improving the consistency of the external environment for collecting transmission spectral characteristics, thereby improving data quality and effectively reducing costs.

[0056] This invention is portable and can acquire high-quality real-time characteristics of sample transmission spectra at low cost, making it suitable for sample transmission spectrum acquisition.

Claims

1. A portable transmission spectrum acquisition device, characterized in that, The portable transmission spectrum acquisition device includes a spectrum acquisition module (3), a light source module (2), a positioning module (4), and a housing (1). The housing (1) includes a top cover (101) and a main housing (102); the top cover (101) is detachably disposed on the top of the main housing (102); the front opening of the main housing (102) is used for the spectral acquisition module (3) to enter and exit; The spectral acquisition module (3) includes a spectral acquisition platform (301), a light-shielding stage (305), an inner shell (302), a guide rail (304), a spectrometer (307), and a collimating lens (308). A pair of guide rails (304) are fixed to the inner surface of the bottom plate of the main housing (102); the bottom end of the inner housing (302) is fixed to the slider of the guide rail (304), and can enter / exit from the front opening of the main housing (102) along the guide rail (304); the spectrometer (307) is fixedly installed in the inner housing (302), and the collimating lens (308) is installed on the acquisition port at the top of the spectrometer (307); the spectral acquisition platform (301) is detachably installed on the top of the inner housing (302), the lower end face of the spectral acquisition platform (301) is provided with a positioning convex ring for accommodating the collimating lens (308), and the upper end face of the spectral acquisition platform (301) is provided with a sample groove corresponding to the collimating lens (308) for placing the sample to be tested; the central axis of the sample groove is coaxial with the optical axis of the collimating lens (308); The positioning module (4) includes a positioning bracket (401), a return spring (402), and a positioning conical pin (403). The positioning bracket (401) is fixed to the bottom plate and rear wall of the main housing (102). The positioning conical pin (403) is vertically inserted into the positioning bracket (401). The return spring (402) is sleeved on the outside of the positioning conical pin (403) and locked between the positioning bracket (401) and the conical head retaining ring. The conical head of the positioning conical pin (403) cooperates with the positioning hole at the rear end of the bottom plate of the inner housing (302) to position the inner housing (302). After the sample is loaded, the conical pin (403) is pulled and the inner housing (302) is pushed back to the predetermined position of the main housing (102). When the spectral acquisition platform (301) is reset, the positioning conical pin (403) is automatically inserted into the positioning hole under the action of the return spring (402) to achieve precise positioning and fixation of the sample. The light source module (2) is arranged above the spectrum acquisition module (3); the light source module (2) includes a light distance adjustment gear (201), a limiting bolt (202), a light source bracket (203), a linear bearing (204), a focusing light source (206), and an auxiliary positioning rod (205). The top ends of the limiting bolt (202) and the auxiliary positioning rod (205) are fixed to the upper cover (101), and the limiting bolt (202) and the auxiliary positioning rod (205) have a certain angle; the limiting bolt (202) passes through the middle of the horizontally set light source bracket (203) and is threadedly connected to the light distance adjustment gear (201) set inside the light source bracket (203); the auxiliary positioning rod (205) is set in the linear bearing (204), and the linear bearing (204) is fixed to the light source bracket (203); two sets of focused light sources (206) are symmetrically installed on the left and right sides of the light source bracket (203), and the illumination center axis of the two sets of focused light sources (206) coincides with the center axis of the sample groove of the spectral acquisition platform (301), that is, the two sets of focused light sources (206) are symmetrically distributed with the center axis of the sample groove of the spectral acquisition platform (301) as the axis.

2. The portable transmission spectral acquisition device according to claim 1, characterized in that, The spectrometer (307) is fixed by a rotating positioning handle (303) screwed into the front end of the inner housing (302), and a protective sleeve (306) is provided at the end of the rotating positioning handle (303) that contacts the spectrometer (307).

3. The portable transmission spectral acquisition device according to claim 1, characterized in that, Different spectral characteristics can be acquired by replacing the spectrometer (307) with different bands.

4. The portable transmission spectral acquisition device according to claim 1, characterized in that, Cooling fans (309) are provided on the left and right sides of the inner casing (302).

5. The portable transmission spectrum acquisition device according to claim 1, characterized in that, By replacing the spectral acquisition platform (301) with different groove shapes, it can be adapted to samples of different sizes or shapes, achieving diversity compatibility.

6. The portable transmission spectral acquisition device according to claim 1, characterized in that, The spectral acquisition platform (301) has a light-shielding stage (305) around the sample groove to absorb ambient stray light and reduce the influence of interference light on the spectral acquisition results.

7. The portable transmission spectral acquisition device according to claim 1, characterized in that, Each group of focused light sources (206) is equipped with a focused cup structure.

8. The portable transmission spectrum acquisition device according to claim 1, characterized in that, The light-concentrating light source (206) is covered with a black light-absorbing material.

9. The portable transmission spectrum acquisition device according to claim 1, characterized in that, When the light distance adjustment gear (201) is rotated, the light source bracket (203) moves up and down along the direction of the limit bolt (202) to realize the adjustment of the light source height. The adjustment range of the distance between the light source and the material is 0~30 mm.

10. The portable transmission spectral acquisition device according to claim 1, characterized in that, The auxiliary positioning rod (205) is arranged at a 45° angle to the limiting bolt (202).

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