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CN-122016733-A - Portable transmission spectrum acquisition device

CN122016733ACN 122016733 ACN122016733 ACN 122016733ACN-122016733-A

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, wherein the spectrum acquisition module comprises a spectrum acquisition platform, a shading table, an inner shell, a guide sliding rail, a spectrometer and a collimating lens, the positioning module comprises a positioning bracket, a reset spring and a positioning taper pin, and the light source module comprises a light distance adjusting gear, a limit bolt, a light source bracket, a linear bearing, a condensing light source and an auxiliary positioning rod. The invention has the characteristics of compact structure, collaborative design of modules, high positioning accuracy, flexible adjustment of light sources, portability and the like, is suitable for real-time transmission spectrum acquisition of different types of samples under multiple scenes, and can be widely applied to qualitative and quantitative analysis of internal components of the samples.

Inventors

  • LI YONGYU
  • LIU JIE
  • ZHANG YUEXIANG
  • PENG KUN

Assignees

  • 中国农业大学

Dates

Publication Date
20260512
Application Date
20260318

Claims (10)

  1. 1. The portable transmission spectrum acquisition device is characterized by comprising a spectrum acquisition module (3), a light source module (2), a positioning module (4) and a shell (1); The shell (1) comprises an upper cover (101) and a main shell (102), wherein the upper cover (101) is detachably arranged at the top of the main shell (102), and the front side of the main shell (102) is provided with an opening for the light spectrum acquisition module (3) to enter and exit; The spectrum acquisition module (3) comprises a spectrum acquisition platform (301), a shading table (305), an inner shell (302), a guide sliding rail (304), a spectrometer (307) and a collimating lens (308); the spectrometer (307) is fixedly arranged in the inner shell (302), the collimating lens (308) is arranged on a collecting port at the top of the spectrometer (307), the spectrum collecting platform (301) is detachably arranged at the top of the inner shell (302), a positioning convex ring for accommodating the collimating lens (308) is arranged on the lower end face of the spectrum collecting platform (301), a sample groove corresponding to the collimating lens (308) is arranged on the upper end face of the spectrum collecting platform (301), and is used for placing a sample to be measured, and the central axis of the sample groove is coaxial with the optical axis of the collimating lens (308); The positioning module (4) comprises a positioning support (401), a reset spring (402) and a positioning taper pin (403), wherein the positioning support (401) is fixedly connected to a bottom plate and a rear wall of the main shell (102), the positioning taper pin (403) vertically penetrates through the positioning support (401), the reset spring (402) is sleeved on the outer side of the positioning taper pin (403) and is clamped between the positioning support (401) and a conical head clamping ring, the conical head of the positioning taper pin (403) is matched with a positioning hole at the rear end of the bottom plate of the inner shell (302) to position the inner shell (302), after a sample is filled, the positioning taper pin (403) is pulled and then the inner shell (302) is pushed back to the preset position of the main shell (102), and after the spectrum acquisition platform (301) is reset, the positioning taper pin (403) is automatically inserted into the positioning hole under the action of the reset spring (402) to realize accurate positioning and fixing of the sample; The light source module (2) is arranged above the spectrum acquisition module (3), and the light source module (2) comprises a light distance adjusting gear (201), a limit bolt (202), a light source bracket (203), a linear bearing (204), a light-gathering light source (206) and an auxiliary positioning rod (205); The light source device comprises a light source support (203), a limiting bolt (202) and an auxiliary positioning rod (205), wherein the top ends of the limiting bolt (202) and the auxiliary positioning rod (205) are fixedly connected to an upper cover (101), the limiting bolt (202) and the auxiliary positioning rod (205) are at a certain angle, the limiting bolt (202) penetrates through the middle of the horizontally arranged light source support (203) and is in threaded connection with a light distance adjusting gear (201) arranged in the light source support (203), the auxiliary positioning rod (205) is arranged in a linear bearing (204), the linear bearing (204) is fixedly connected to the light source support (203), two groups of light gathering sources (206) are symmetrically arranged on the left side and the right side of the light source support (203), and the illumination central axes of the two groups of light gathering sources (206) are coincident with the central axis of a sample groove of the spectrum acquisition platform (301), namely, the two groups of light gathering sources (206) are symmetrically distributed by taking the central axis of the sample groove of the spectrum acquisition platform (301) as an axis.
  2. 2. The portable transmission spectrum acquisition device according to claim 1, characterized in that the spectrometer (307) is fixed by a rotational positioning handle (303) screwed in from the front end face of the inner housing (302), and one end of the rotational positioning handle (303) contacting the spectrometer (307) is provided with a protective sleeve (306).
  3. 3. The portable transmission spectrum acquisition device according to claim 1, characterized in that the acquisition of spectral features of different wavebands is achieved by replacing a different waveband spectrometer (307).
  4. 4. The portable transmission spectrum collection device according to claim 1, wherein the inner housing (302) is provided with cooling fans (309) on both left and right sides.
  5. 5. The portable transmission spectrum acquisition device according to claim 1, characterized in that by exchanging spectrum acquisition platforms (301) of different groove shapes, a diversity compatibility is achieved adapting to samples of different sizes or morphologies.
  6. 6. The portable transmission spectrum collection device according to claim 1, wherein a light shielding table (305) is arranged around the sample groove of the spectrum collection platform (301) and is used for absorbing ambient stray light and reducing the influence of interference light on the spectrum collection result.
  7. 7. The portable transmission spectrum collection device according to claim 1, wherein each set of light-gathering sources (206) is provided with a light-gathering cup structure.
  8. 8. The portable transmission spectrum collection device according to claim 1, wherein the light-condensing source (206) is externally coated with a black light-absorbing material.
  9. 9. The portable transmission spectrum acquisition device according to claim 1, wherein when the light distance adjusting gear (201) is rotated, the light source support (203) moves up and down along the direction of the limit bolt (202), so that the height adjustment of the light source is realized, and the adjustment range of the distance between the light source and the material is 0-30 mm.
  10. 10. The portable transmission spectrum acquisition device according to claim 1, characterized in that the auxiliary positioning rod (205) is arranged at an angle of 45 ° to the limit bolt (202).

Description

Portable transmission spectrum acquisition device Technical Field The invention relates to the technical field of spectrum detection, in particular to a portable transmission spectrum acquisition device for real-time acquisition of transmission spectrums of multi-phase samples, which is suitable for qualitative and quantitative analysis of substance components. Background The transmission spectrum technology is an analysis method based on the interaction principle of light and substances, and is widely applied to the fields of food safety detection, medicine quality control, biological sample analysis, material science research and the like. By analyzing the transmission characteristics of the sample on the incident light with different wavelengths, the qualitative and quantitative detection of the internal components can be realized. The current widely applied diffuse reflection and diffuse transmission spectrum technology has certain advantages in signal intensity acquisition, but because incident light is mainly reflected on the surface of a sample or the propagation path inside the sample is shorter, the acquired spectrum information mainly reflects the characteristics of the surface layer or near-surface layer of the sample, and the integral information of the sample with unevenly distributed internal components is difficult to effectively analyze. Most of the existing transmission spectrum collection devices are of fixed structures, samples are loaded by using a cuvette, the device is mainly suitable for analysis of liquid phase samples, and transmission collection of solid or semisolid samples is more easily interfered by factors such as light source deflection, sample shaking, stray light and the like. The device has the technical bottlenecks that firstly, the position between a light source and a sample is not adjustable, measurement conditions are difficult to optimize for samples with different thicknesses or forms, secondly, the sample fixing mode is unstable, so that repeatability is poor, thirdly, the structural design lacks generality, liquid, solid, semisolid or high-viscosity samples are difficult to be compatible, fourthly, part of the device is complex in design and high in manufacturing cost, and popularization and application in portable detection, teaching experiments or small and medium-sized experimental scenes are limited. In the prior art, patent application publication number CN 111665221a discloses a device for detecting seed vitality based on transmission spectrum, the device realizes the fixing function of materials by processing a plurality of through holes on opaque plates on the front side and the back side to clamp seeds, a supercontinuum laser is used for emitting collimated pulse broadband light beams, and a small hole diaphragm is used for intercepting the central part of the pulse broadband light beams to form a first light beam irradiation sample. However, the technical scheme still has the following problems that (1) the method is only suitable for clamping particles with more regular shapes, if the clamped materials are irregular in shape, light can leak from gaps between the materials and the clamping plates to influence measurement accuracy, (2) the method is only suitable for transmission spectrum information acquisition of solid-phase objects, (3) the method for fixing the materials by nuts consumes time and labor, and (4) the device does not consider the influence of the distance between the light source and the materials on acquisition results. The patent application with publication number CN107389559A discloses a method for measuring the component content of bagged complex solution by using multi-position transmission spectrum, which uses a packaging bag to load liquid materials and utilizes light sources and spectrum receiving devices distributed on two sides of the packaging bag to realize the transmission spectrum acquisition function of the complex solution. However, the technical solution still has the problems that (1) loading the sample by using the flexible material can cause random change of the effective optical path when the sample is loaded each time, and the deformation is caused by sample density, loading mode and material fatigue, so that the transmission spectrum signal of the sample is collected each time. According to Beer-Lambert law, the optical path in solution has a significant negative correlation with the light intensity, so that random variations in the optical path can lead to random error formation. (2) The influence of stray light on the detection result is difficult to avoid when the liquid phase sample is loaded by using the measuring bag, and (3) the scheme is only suitable for the transmission spectrum information acquisition of the liquid phase object. Therefore, there is a need to develop a portable transmission spectrum acquisition device with compact structure, accurate positioning, adjustable distance between a light sourc