A light source excitation assembly for a spectrometer

Abstract

The present application relates to the technical field of spectrometer, and specifically discloses a light source excitation assembly of a spectrometer, the spectrometer comprising a light inlet channel, the light source excitation assembly comprising: a placing table cooperating with a clamping component; a through hole is arranged in the middle of the placing table, the center of the through hole is coaxial with the center of a bottom excitation component; an excitation table is arranged in close contact with the bottom of the placing table, a groove is arranged on the excitation table, one end of the groove facing the light inlet channel abuts against an adjustable light barrier, a ventilation hole is arranged at the bottom of the end of the groove away from the light inlet channel, and a light inlet hole corresponding to the light inlet channel is arranged on the excitation table; the adjustable light barrier is arranged in the center of the through hole of the light inlet channel, and the light transmission height of the adjustable light barrier is adjustable; the bottom excitation component is fixedly arranged in the middle of the groove; and the axis of the light inlet channel is arranged at a preset included angle with the plane where the light inlet hole is located. Through improvement of the light source excitation assembly, a larger irradiation intensity is allowed to be used for detection of a sample to be measured, so that the characteristic spectral signal dispersion rate and signal density during detection are improved, and the detection range of substances is expanded.

Description

Technical Field

[0001] This invention relates to the field of spectrometer technology, and more specifically to a light source excitation component for a spectrometer. Background Technology

[0002] As a core device for qualitative and quantitative analysis of substances, the spectrometer is widely used in environmental monitoring, biomedicine, rapid on-site detection of minerals, semiconductor thin film detection and other fields. It relies on the front-end light source excitation component to output an excitation beam to irradiate the sample to be tested in order to collect characteristic spectral signals. Therefore, the front-end light source excitation component directly determines the signal-to-noise ratio, detection accuracy, measurement range and service life of the whole machine.

[0003] Existing spectrometers are primarily used for quantitative or qualitative detection of specific or single substances. However, with continuous technological advancements, higher demands are being placed on the detectable range and detection accuracy of spectrometers. In practice, by pre-setting the irradiation intensity corresponding to the sample and vertically aligning the light path with the front-end excitation component, the characteristic spectral signal generated by excitation can be accurately acquired. However, in practical applications, technicians have discovered at least the following technical problems with existing spectrometers:

[0004] On the one hand, the traditional spectrometer setup is designed to accurately detect the types of substances, so it uses a spectrometer with a fixed configuration and a pre-set and calibrated irradiation intensity. However, this also limits the substance detection range of the traditional spectrometer and cannot meet a wider range of detection needs.

[0005] On the other hand, the current configuration of the light intake path and the front-end light source excitation component can obtain sufficient characteristic spectral signals when detecting a single substance. However, when applied to the detection of multiple substances, the dispersion rate and signal density of the acquired characteristic spectral signals are insufficient, making it impossible to use the acquired characteristic spectral signals for more accurate analysis of multiple substances. Therefore, the existing technology cannot meet the actual needs. Summary of the Invention

[0006] In order to overcome the above-mentioned technical problems in the prior art, the present invention provides a light source excitation component for a spectrometer. By improving the structure of the existing light source excitation component, the number of detectable substances of the spectrometer is effectively expanded and the detection accuracy is improved.

[0007] To achieve the above objectives, embodiments of the present invention provide a light source excitation assembly for a spectrometer, applied to a spectrometer including a light intake path. The light source excitation assembly includes: a placement stage, which cooperates with a clamping component to fix the sample to be tested on the placement stage; a through hole is provided in the middle of the placement stage, the center of the through hole being coaxial with the center of the bottom excitation component, and the sample to be tested completely covering the through hole; and an excitation stage, which is fitted against the bottom of the placement stage, and has a groove, the end of the groove facing the light intake path abutting against an adjustable aperture. A ventilation hole is provided at the bottom of the end of the groove away from the light-gathering path, and a light-gathering hole is provided on the excitation stage corresponding to the light-gathering path; the adjustable light barrier is centered on the through hole of the light-gathering path, and the light transmission height of the adjustable light barrier is adjustable; the bottom excitation component is fixedly disposed in the middle of the groove, and the central axis of the bottom excitation component, the central axis of the groove, and the central axis of the adjustable light barrier are located in the same plane; the axis of the light-gathering path is set at a preset angle with the plane where the light-gathering hole is located, and the preset angle is determined according to the preset dispersion rate, and the preset angle is not equal to 90°.

[0008] Preferably, the groove includes an excitation groove corresponding to the bottom excitation component, a light guide groove abutting against the light inlet path, and a dust removal groove. The excitation groove, the light guide groove, and the dust removal groove are integrally formed. The light guide groove abuts against the adjustable light bar. The dust removal groove is provided with the ventilation hole. The first distance between the ventilation hole and the bottom excitation component is greater than the second distance between the adjustable light bar and the bottom excitation component. The excitation groove includes an excitation through hole and a support portion. The bottom excitation component penetrates the excitation through hole. The top of the bottom excitation component is higher than the edge of the groove and lower than the top of the support portion.

[0009] Preferably, the excitation groove further includes a first air outlet, which is disposed facing the excitation through hole and the dust removal groove; the dust removal groove includes an arc-shaped groove, and the excitation groove is connected to the ventilation hole through the arc-shaped groove; the ventilation hole is not located on the connecting line between the adjustable light bar and the through hole.

[0010] Preferably, a second air outlet is provided at the top of the light inlet; the first air outlet sprays inert gas at a first air flow rate, and the second air outlet sprays inert gas at a second air flow rate, wherein the first air flow rate is less than the second air flow rate.

[0011] Preferably, the light guide groove includes an integrally formed horizontal light limiting groove and an inclined light guide groove; the horizontal light limiting groove includes an inclined dustproof side and a parallel light guiding side, the vertical projection of the inclined dustproof side is trapezoidal, the bottom edge of the trapezoid is connected to the excitation groove, the top edge is connected to the parallel light guiding side, and the parallel light guiding side extends from the inclined dustproof side to the adjustable light barrier; one end of the inclined light guide groove is connected to the bottom of the excitation groove, and the other end is connected to the bottom of the adjustable light barrier.

[0012] Preferably, the adjustable aperture includes an upper adjustable aperture and a lower adjustable aperture, which are respectively bolted to the excitation stage.

[0013] Preferably, multiple metal wires are arranged around the bottom of the excitation stage, and the multiple metal wires are respectively connected to the grounding terminal to form a Faraday cage structure. The number of metal wires is determined according to the target electromagnetic interference outside the Faraday cage structure. The bottom excitation component is located inside the Faraday cage structure. A metal connecting plate is also provided on the side of the excitation stage, and the metal connecting plate is grounded.

[0014] Preferably, the method further includes a method for adjusting the adjustable light bar, the method comprising: performing an initial position configuration on the adjustable light bar; acquiring a characteristic spectral signal passing through the adjustable light bar at the initial position; acquiring clutter information in the characteristic spectral signal; determining height adjustment information of the adjustable light bar based on the clutter information; and adjusting the light transmission height of the adjustable light bar based on the height adjustment information.

[0015] Preferably, the method further includes a method for adjusting the light-gathering path, the method comprising: determining the substance to be detected and obtaining the characteristic spectral curve of the substance to be detected; determining the expected spectral resolution of the characteristic spectral signal based on the characteristic spectral curve; determining the corresponding grating dispersion rate based on the expected spectral resolution; determining the preset angle between the light-gathering path and the plane where the light-transmitting aperture is located based on the grating dispersion rate; and adjusting the light-gathering path based on the preset angle.

[0016] Preferably, the method for debugging the light-gathering path further includes: performing spectral overlap analysis on the characteristic spectral curve to generate spectral overlap information; determining adjacent interference spectral lines based on the spectral overlap information; optimizing the grating dispersion rate based on the adjacent interference spectral lines to generate an optimized dispersion rate; and determining an optimized preset angle based on the optimized dispersion rate.

[0017] On the other hand, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method provided in the embodiments of the present invention.

[0018] The present invention has at least the following technical effects through the technical solution provided by the present invention:

[0019] 1. By setting the adjustable light transmission height of the adjustable aperture, the function of adjusting the irradiation intensity according to different samples to be tested is realized, thus expanding the material detection range of the spectrometer;

[0020] 2. By setting a certain angle between the axis of the light-gathering path and the plane where the light-transmitting hole is located, and determining the preset angle based on the preset dispersion rate, the dispersion rate of the characteristic spectral signal during the detection of various substances is improved, and the signal density is increased.

[0021] 3. By setting a dust removal groove in the groove, and spraying inert gas with the first and second air outlets, dust pollution can be effectively prevented;

[0022] 4. By setting a Faraday cage structure at the bottom of the excitation stage, electromagnetic interference is effectively shielded, thus improving the detection accuracy.

[0023] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a schematic diagram of the structure of the light source excitation assembly of the spectrometer provided in an embodiment of the present invention;

[0026] Figure 2 This is a partial cross-sectional view of the light source excitation assembly of the spectrometer provided in an embodiment of the present invention;

[0027] Figure 3 This is a top view of the excitation stage provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the groove structure provided in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the adjustable light bar provided in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the Faraday cage structure provided in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures

[0032] Placement platform 10, through hole 11, clamping component 20, bottom excitation component 30, excitation platform 40, groove 41, ventilation hole 411, excitation groove 412, excitation through hole 4121, support part 4122, first air outlet 4123, second air outlet 4124, light guide groove 413, horizontal light limiting groove 4131, inclined light guide groove 4132, dust removal groove 414, arc-shaped groove 4141, light inlet hole 42, metal wire 43, metal connecting plate 44, adjustable light bar 50, upper adjustable light bar 51, lower adjustable light bar 52, light inlet path 100 Detailed Implementation

[0033] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0034] In this invention, the terms "system" and "network" are used interchangeably. "Multiple" refers to two or more; therefore, in this invention, "multiple" can also be understood as "at least two." "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Additionally, the character " / ", unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship. Furthermore, it should be understood that in the description of this invention, terms such as "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or order.

[0035] The background technology of this invention will be introduced first below.

[0036] Current spectrometers typically detect only one type of target substance. Technicians need to determine the approximate spectral range of the substance beforehand, adjust the equipment parameters, and then analyze the spectral curve of the substance to identify it. However, with technological advancements, spectrometers are expensive, and existing spectrometers can only analyze and identify single-type substances. There is a growing desire to detect and identify a wider range of substances to reduce costs. During the identification process, the spectrometer's light source excitation component, acting as the excitation chamber for the analyte, is crucial for the accuracy, comprehensiveness, and reliability of the spectral signal it generates.

[0037] To meet the above further usage requirements, please refer to Figures 1-3This invention provides a light source excitation assembly for a spectrometer, applied to a spectrometer including a light inlet path 100. The light source excitation assembly includes: a stage 10, which cooperates with a clamping component 20 to fix the sample to be tested on the stage 10; a through hole 11 is provided in the middle of the stage 10, the center of the through hole 11 is coaxial with the center of the bottom excitation component 30, and the sample to be tested completely covers the through hole 11; an excitation stage 40, which is fitted to the bottom of the stage 10, and a groove 41 is provided on the excitation stage 40. One end of the groove 41 facing the light inlet path 100 abuts against an adjustable aperture 50, and the groove 41 is located away from the light inlet path 100. A ventilation hole 411 is provided at the bottom of one end of the light-gathering path 100, and a light-gathering hole 42 is provided on the excitation stage 40 corresponding to the light-gathering path 100; the adjustable light barrier 50 is centered on the through hole of the light-gathering path 100, and the light transmission height of the adjustable light barrier 50 is adjustable; the bottom excitation component 30 is fixedly disposed in the middle of the groove 41, and the central axis of the bottom excitation component 30, the central axis of the groove 41, and the central axis of the adjustable light barrier 50 are located in the same plane; the axis of the light-gathering path 100 is set at a preset angle with the plane where the light-gathering hole 42 is located, and the preset angle is determined according to the preset dispersion rate, and the preset angle is not equal to 90°.

[0038] In one possible implementation, a company needs to perform material testing on a metal block, and therefore places it on the light source excitation assembly provided in this embodiment of the invention for spectral detection. Specifically, the clamping component 20 is screwed to the side of the placement stage 10 when not in use. After the sample to be tested is placed on the placement stage 10 and covers the central through hole 11, the clamping component 20 is screwed above the sample and fixed thereon. Specifically, the clamping component 20 presses and fixes the sample to be tested above the through hole 11 to prevent excitation light leakage and to avoid interference from external light to the spectrometer. A through hole 11 is provided in the center of the placement stage 10, and the center of the through hole 11 is coaxially arranged with the center of the bottom excitation groove 412 component 30 to ensure that the excitation light can accurately pass through the through hole 11 and strike the sample to be tested to generate excitation light. An excitation stage 40 is also attached to the bottom of the placement stage 10, for example, by bolt connection or welding, and a groove 41 is provided on the excitation stage 40.

[0039] One end of the groove 41 facing the light-entry path 100 abuts against the adjustable aperture 50 to guide the excitation light from the light-entry hole to the light-entry path 100. In specific setup processes, to achieve the detection of more types of substances, technicians increase the excitation power of the bottom excitation groove 412 element 30 to obtain a stronger excitation light that contains spectral signals from more substances. However, this method also results in the intensity of the excitation light being significantly higher than the detectable range of current spectrometers, and also generates more noise.

[0040] To address the aforementioned technical issues, the light transmission height of the adjustable aperture 50 is further adaptively adjusted. In this embodiment, the adjustable aperture 50 is centered with the through-hole of the light-entry path 100 to ensure that the excitation light entering the adjustable aperture 50 can effectively enter the light-entry path 100. Simultaneously, technicians can adjust the light transmission height of the adjustable aperture 50 according to actual needs, such as the peak information and light signal intensity information of the spectral signal corresponding to the type of substance to be detected. For example, a dedicated adjustment mechanism or manual adjustment can be used to adjust the light transmission height of the adjustable aperture 50 to achieve physical filtering of noise and ensure that the spectral signal entering the light-entry path 100 meets the detection requirements of the target substance.

[0041] In this embodiment of the invention, the bottom excitation groove 412 piece 30 is fixedly disposed in the middle of the groove 41, and the central axis of the bottom excitation groove 412 piece 30, the central axis of the groove 41 and the central axis of the adjustable light barrier 50 are located in the same plane to ensure the geometric consistency of the optical path.

[0042] Furthermore, in this embodiment of the invention, the light-entry path 100 and the bottom excitation component 30 are configured non-perpendicularly. Specifically, the axis of the light-entry path 100 is set at a preset angle to the plane where the light-entry aperture 42 is located. The preset angle is determined according to a preset dispersion rate and is not equal to 90°. For example, the preset angle is set according to the expected dispersion rate, spectral density, and other indicators of the spectral signal, such as 15°-75° or 105°-165°. By adjusting the angle of the light-entry path 100, the best dispersion effect can be achieved when detecting different substances, and the data presentation effect of the subsequent spectral signal can be further improved, providing a data basis for the simultaneous detection of multiple substances.

[0043] In this embodiment of the invention, by optimizing the structure of the light source excitation component and dynamically and adaptively configuring the aperture, the bottom excitation slot 412 pieces 30 can irradiate the sample under test with higher laser irradiation power to obtain a more comprehensive and richer spectral signal. At the same time, it can effectively filter out clutter. Combined with the non-perpendicularly set light inlet path 100, it can realize the refraction processing of the original spectral signal, so that the spectral signal obtained by the spectrometer has higher spectral density and dispersion rate, and can realize the accurate analysis and identification of multiple, dense and adjacent spectral signals, further realizing the accurate identification of multiple types of substances.

[0044] In the embodiments of the present invention, please refer to Figure 1 , Figure 4 The groove 41 includes an excitation groove 412 corresponding to the bottom excitation component 30, a light guide groove 413 abutting against the light inlet path 100, and a dust removal groove 414. The excitation groove 412, the light guide groove 413, and the dust removal groove 414 are integrally formed. The light guide groove 413 abuts against the adjustable light barrier 50. The dust removal groove 414 is provided with a ventilation hole 411. The first distance between the ventilation hole 411 and the bottom excitation component 30 is greater than the second distance between the adjustable light barrier 50 and the bottom excitation component 30. The excitation groove 412 includes an excitation through hole 4121 and a support portion 4122. The bottom excitation component 30 is disposed through the excitation through hole 4121. The top of the bottom excitation component 30 is higher than the edge of the groove 41 and lower than the top of the support portion 4122.

[0045] Specifically, the groove 41 is composed of three parts: an integrally formed excitation groove 412, a light guide groove 413, and a dust removal groove 414. The light guide groove 413 is abutted against the light inlet passage 100 and an adjustable light baffle 50 is installed on it. The dust removal groove 414 is located at the end of the groove 41 away from the light inlet passage 100 and is provided with a ventilation hole 411 for discharging dust particles carried by the clean gas. In this embodiment of the invention, the first distance between the ventilation hole 411 and the bottom excitation groove 412 30 is greater than the second distance between the adjustable aperture 50 and the bottom excitation groove 412 30. Through the above arrangement, a corresponding airflow channel is formed. For example, technicians can set an air jet at the light inlet 42 to cooperate with the above structure, so that dust can be isolated outside the light inlet 42 during the use of the spectrometer and the excitation of spectral light. At the same time, by increasing the path length of the dust during the discharge process, the difficulty of it being blown back in the air field can be increased, thereby effectively discharging the dust and avoiding interference with the lens at the entrance of the light inlet path 100, thus improving the detection accuracy of subsequent spectral detection.

[0046] Furthermore, the excitation groove 412 includes an excitation through hole 4121 and a support portion 4122. The bottom excitation groove 412 piece 30 penetrates the excitation through hole 4121, and its top is higher than the edge of the groove 41 and lower than the top of the support portion 4122, so as to be close to the bottom of the sample to be tested, so as to achieve sufficient laser excitation effect on the sample to be tested and generate corresponding excitation light.

[0047] In practical applications, although a ventilation port is provided in the light source excitation assembly, if the light inlet 42, the dust removal channel, and the ventilation port 411 are located on the same axis, when the dust is blown in the groove 41 of the excitation stage 40, a small amount of dust is easily bounced back to the vicinity of the light inlet 42 due to the disturbance and collision in the wind field. Since the spectrometer has high requirements for the quality of light, this will still cause interference to the lens and further reduce the accuracy of subsequent spectral detection.

[0048] In the embodiments of the present invention, please refer to Figure 4 The excitation groove 412 further includes a first air outlet 4123, which is disposed toward the excitation through hole 4121 and the dust removal groove 414; the dust removal groove 414 includes an arc-shaped groove 4141, and the excitation groove 412 is connected to the ventilation hole 411 through the arc-shaped groove 4141; the ventilation hole 411 is not located on the connecting line between the adjustable light bar 50 and the through hole 11.

[0049] In the specific implementation process, the first air outlet 4123 is configured as a groove 41 located on the side wall facing the excitation through hole 412111 and the dust removal groove 414. That is, the first air outlet 4123 is located in the semi-circular area of ​​the excitation through hole 412111 near the light-gathering passage 100, thereby achieving a blowing effect "back to" the excitation through hole 4121, so that the airflow always blows the dust away from the light-gathering passage 100 and guides it to the ventilation hole 411 of the dust removal groove 414; at the same time, an arc-shaped groove is also provided in the dust removal groove 414. The excitation groove 412 is connected to the ventilation hole 411 through the arc-shaped groove 4141. Based on this, the ventilation hole 411 is not located on the connecting line between the adjustable light bar 50 and the through hole 11. In subsequent use, once the dust blown by the first air outlet 4123 enters the arc-shaped groove 4141, even if a small amount of dust rebounds, it will not be able to retreat back to the excitation groove 412 or even drift to the vicinity of the light-gathering passage 100 due to the side wall action of the arc-shaped groove 4141, thus achieving reliable dust removal.

[0050] However, during the implementation of the first air outlet 4123, since the first air outlet 4123 is inclined to the transmission path of the spectral light to blow away the dust, there will inevitably be disturbance in the air field, which will cause some dust to be blown to the vicinity of the light inlet path 100, affecting the subsequent detection effect.

[0051] To solve the above-mentioned technical problems, in this embodiment of the invention, a second air outlet 4124 is provided at the top of the light inlet 42; the first air outlet 4123 sprays inert gas at a first air flow rate, and the second air outlet 4124 sprays inert gas at a second air flow rate, wherein the first air flow rate is less than the second air flow rate.

[0052] Specifically, in this embodiment of the invention, a second air outlet 4124 is provided at the top of the light inlet 42. Both the first air outlet 4123 and the second air outlet 4124 spray inert gas, such as argon or nitrogen. The first air flow rate of the first air outlet 4123 is less than the second air flow rate of the second air outlet 4124, for example, the first air flow rate is 0.5 l / min and the second air flow rate is 1 l / min. Thus, in subsequent use, a Y-shaped airflow channel from top to bottom is formed, which allows dust to be effectively discharged to the ventilation port and prevents it from reaching the light inlet 42. This achieves effective cleaning of the light inlet 42 and reliable dust discharge, ensuring the accuracy of data in the spectral detection process.

[0053] Because spectrometers have extremely high requirements for spectral signals, especially in scenarios where multiple substances are detected simultaneously, there may be situations where the spectral curves of two substances are very close together. If key data is lost due to dust obstruction, it will have a significant impact on the detection results and accuracy.

[0054] To further prevent dust from being blown near the light inlet aperture 42 during the spectral signal excitation process, in this embodiment of the invention, please refer to... Figure 4 The light guide groove 413 includes an integrally formed horizontal light limiting groove 4131 and an inclined light guide groove 4132; the horizontal light limiting groove 4131 includes an inclined dustproof side and a parallel light guiding side, the vertical projection of the inclined dustproof side is trapezoidal, the bottom edge of the trapezoid is connected to the excitation groove, the top edge is connected to the parallel light guiding side, and the parallel light guiding side extends from the inclined dustproof side to the adjustable light barrier 50; one end of the inclined light guide groove 4132 is connected to the bottom of the excitation groove 412, and the other end is connected to the bottom of the adjustable light barrier 50.

[0055] Specifically, the path for transmitting the laser signal to the light inlet 42 is divided into two segments. One segment is an inclined dustproof section, which uses an inclined dustproof side with a trapezoidal vertical projection to further block dust. If a small amount of dust is blown towards the light inlet 42, it can still be blocked and settled by the inclined edge of the inclined dustproof side, and then blown to the ventilation hole 411 and discharged by the second air outlet 4124, so as to further prevent the dust from affecting the light inlet path 100. The parallel light guide side remains parallel to form a horizontal light transmission channel to reliably guide the excited spectral signal to the adjustable light bar 50, and after being filtered by the adjustable light bar 50, it is transmitted to the light inlet path 100 for subsequent spectral identification. Since the light inlet path and the light source excitation component provided in this embodiment of the invention are not perpendicular, the spectral signal is also guided to the light inlet path 100 at a corresponding inclined angle by the inclined light guide groove 4132, and refracted by the lens at the entrance of the light inlet path 100 to increase the dispersion rate of the spectral signal.

[0056] In this embodiment of the invention, since the excitation power during the spectral excitation process is increased, the amount of dust generated is also greatly increased. Therefore, by adopting a combination configuration of dual air outlets + non-through dust discharge outlets + inclined dustproof sides, dust can be effectively intercepted and discharged from multiple directions and dimensions, ensuring the cleanliness of the light intake path, ensuring that the spectral signal is not affected by interference, and improving the accuracy of subsequent spectral detection.

[0057] In practical applications, different substances have different spectral signals, so simply adjusting the light transmission height above the aperture may not meet the actual needs.

[0058] In the embodiments of the present invention, please refer to Figure 5 The adjustable aperture 50 includes an upper adjustable aperture 51 and a lower adjustable aperture 52, which are respectively bolted to the excitation stage 40.

[0059] In the specific implementation process, the bolts can be loosened first, the lower adjustment aperture 52 can be adjusted to the required height, and after tightening the bolts, the upper adjustment bolt 51 can be further adjusted to the required height, and then the bolts can be tightened to fix the position. This achieves the up and down adjustment of the light transmission height and the up and down screening of the spectral signal. The coordinated setting of the upper adjustment aperture 51 and the lower adjustment aperture 52 can achieve fine adjustment of the light transmission height, with an adjustment accuracy of up to 0.1mm.

[0060] In practical applications, because the spectrometer provided in this embodiment of the invention greatly increases the excitation power of the laser, the electromagnetic interference signal generated during the excitation of the spectral signal also increases significantly, causing considerable interference to the internal detection circuit of the spectrometer.

[0061] To solve the above-mentioned technical problems, please refer to the embodiments of the present invention. Figure 6 Multiple metal wires 43 are arranged around the bottom of the excitation platform 40. The multiple metal wires 43 are respectively connected to the grounding terminal to form a Faraday cage structure. The number of metal wires 43 is determined according to the target electromagnetic interference outside the Faraday cage structure. The bottom excitation component 30 is located inside the Faraday cage structure. A metal connecting plate 44 is also provided on the side of the excitation platform 40. The metal connecting plate 44 is grounded.

[0062] In one possible implementation, based on the amount of electromagnetic interference generated by the bottom excitation slot 412 30 when operating at full power, and the acceptable amount of electromagnetic interference for the internal electrical components and external circuit boards of the spectrometer, it can be determined that the Faraday cage structure should eliminate the amount of electromagnetic interference from the bottom excitation slot 412 30. Thus, it can be determined how many metal wires 43 should be arranged around the Faraday cage structure to achieve the above effect, and the arrangement is based on this number. For example, the metal wires 43 are made of copper or aluminum, have a diameter of 0.5 mm to 2 mm, and number 4 to 12, evenly arranged around the bottom of the excitation stage 40.

[0063] To further improve the electromagnetic interference elimination effect or reduce the number of metal wires 43, a non-uniform configuration can be used to configure the metal wires 43. Specifically, the metal wires 43 are configured with a higher density in the direction towards the spectrometer or external circuit board, and with a lower density in the direction away from the spectrometer or external circuit board, so as to achieve the same electromagnetic interference elimination effect based on the optimized configuration of the metal wires 43.

[0064] After the Faraday cage structure is configured, the bottom excitation slots 412 pieces 30 should be located within its coverage area to effectively shield electromagnetic interference and improve the signal-to-noise ratio of signal detection. To further improve the elimination effect of electromagnetic interference, a metal connecting plate 44 is also provided on the side of the excitation stage 40. The metal connecting plate 44 is grounded by welding or bolting. The metal connecting plate 44 is made of copper or aluminum, with a width of 10mm to 30mm and a thickness of 1mm to 3mm.

[0065] In this embodiment of the invention, a method for adjusting the adjustable light bar is also included. The method for adjusting the adjustable light bar includes: performing an initial position configuration on the adjustable light bar; acquiring a characteristic spectral signal passing through the adjustable light bar at the initial position; acquiring clutter information in the characteristic spectral signal; determining height adjustment information of the adjustable light bar based on the clutter information; and adjusting the light transmission height of the adjustable light bar based on the height adjustment information.

[0066] In one possible implementation, to ensure optimal active denoising of the spectral signal, the adjustable aperture is first configured with an initial position, for example, by adjusting the upper and lower apertures to the positions with the maximum light-gathering height. Then, the characteristic spectral signal passing through the adjustable aperture at the initial position is acquired, including the spectral intensity curve and wavelength distribution information. For example, in this embodiment of the invention, a driving device can be configured on the adjustable aperture to automatically adjust the vertical height of the aperture based on the real-time feedback of the spectral intensity curve and wavelength distribution information, thereby achieving intelligent control. Specifically, at this point, clutter information is identified through the characteristic spectral signal. This clutter information includes, but is not limited to, parameters such as clutter peaks, clutter frequencies, light intensity, noise levels, and background interference intensity. Then, the height adjustment information of the adjustable aperture is determined based on this clutter information. For example, based on the aforementioned clutter information, technicians first determine the peak and trough ranges of the spectral signals of various samples to be tested, thereby initially determining the initial adjustment height of the adjustable aperture. Then, based on clutter frequency, light intensity, noise levels, and background interference intensity, the initial adjustment height is further fine-tuned. For instance, when the signal-to-noise ratio of the clutter information is lower than a preset threshold, it is determined that the transmission height needs to be increased; when the signal-to-noise ratio of the clutter information is higher than the preset threshold, it is determined that the transmission height needs to be decreased. The height adjustment amount can be determined using a formula. Calculation, where For height adjustment amount, For adjustment coefficients, For the target signal-to-noise ratio, This represents the actual signal-to-noise ratio. After the adjusted spectral signal meets the final detection accuracy and reliability requirements, the corresponding height adjustment information is determined, and the light transmission height of the adjustable aperture is adjusted according to this height adjustment information.

[0067] In this embodiment of the invention, by precisely adjusting the vertical height of the adjustable aperture based on the physical characteristics of the spectral signals of various substances during the actual acquisition process, noise can be effectively filtered physically, greatly improving the reliability of subsequent spectral identification. By superimposing the spectrometer's own spectral correction algorithm, accurate correction and identification of spectral signals can be achieved, improving detection accuracy.

[0068] Furthermore, in this embodiment of the invention, since the light-entry path and the light source excitation component are configured in a non-perpendicular manner, and the light refraction effect caused by different tilt angles is completely different, in order to ensure that the spectral signal that finally enters the spectrometer can provide the best signal effect and effective signal data, it needs to be precisely configured.

[0069] In this embodiment of the invention, a method for adjusting the light-gathering path is also included. The method for adjusting the light-gathering path includes: determining the substance to be detected and obtaining the characteristic spectral curve of the substance to be detected; determining the expected spectral resolution of the characteristic spectral signal based on the characteristic spectral curve; determining the corresponding grating dispersion rate based on the expected spectral resolution; determining the preset angle between the light-gathering path and the plane where the light-transmitting aperture is located based on the grating dispersion rate; and adjusting the light-gathering path based on the preset angle.

[0070] In one possible implementation, the substance to be detected is first obtained, and its characteristic spectral curve is acquired. For example, in this embodiment of the invention, substances A, B, and C in the sample need to be detected and identified. The spectral curves of substances B and C are relatively close; if a traditional detection method is used, they may be identified as partially overlapping, leading to incorrect identification. Therefore, in this embodiment of the invention, the characteristic spectral curves of the three substances are first obtained. The characteristic spectral curve includes all characteristic spectral line wavelengths and corresponding theoretical intensities of the substance. Then, the expected spectral resolution is determined, for example, characterized as… ,in For spectral resolution, The average characteristic wavelength, This represents the minimum characteristic wavelength interval.

[0071] At this point, the corresponding grating dispersion rate is determined based on the expected spectral resolution, for example, it can be characterized as... ,in For dispersion, The diffraction angle, The incident light wavelength is given. Finally, the preset angle between the light-gathering path and the plane containing the light-transmitting aperture is determined based on the grating dispersion rate, for example, characterized as... ,in For the preset angle, The grating constant is This refers to the focal length of the spectrometer. At this point, the light-gathering path and the light source excitation components of the spectrometer can be configured according to the aforementioned preset angle.

[0072] In this embodiment of the invention, by analyzing the optimal configuration angle of the material to be detected based on its spectral characteristics, the relative positions of the light-gathering path and the light source excitation component can be configured scientifically and reasonably, so that the detection data meets the actual requirements.

[0073] However, in practical applications, although the spectrometer configured as described above can acquire spectral signals with sufficient dispersion, the spectral signals of some substances are very close, which makes them easy to identify as partially overlapping during detection, and further leads to detection errors.

[0074] In this embodiment of the invention, the debugging method of the light-gathering path further includes: performing spectral overlap analysis on the characteristic spectral curve to generate spectral overlap information; determining adjacent interference spectral lines based on the spectral overlap information; optimizing the grating dispersion rate based on the adjacent interference spectral lines to generate an optimized dispersion rate; and determining an optimized preset angle based on the optimized dispersion rate.

[0075] In the specific implementation process, spectral overlap analysis is further performed on the characteristic spectral curves to generate spectral overlap information. Spectral overlap analysis is used to detect whether there are wavelength overlap regions between different characteristic spectral lines. If wavelength overlap regions exist, neighboring interfering spectral lines are determined based on this spectral overlap information, including the wavelength position and intensity information of the interfering spectral lines. The grating dispersion rate is then further optimized to generate an optimized dispersion rate. For example, the influence of neighboring interfering spectral lines can be minimized using an objective function, which can be characterized as... ,in For the first Article and Section The wavelength difference of the spectral lines is used to determine the optimized preset angle based on the optimized dispersion rate, and the light-inlet path and the light source excitation components are optimized and configured.

[0076] In this embodiment of the invention, the above optimization steps can further improve the spectral resolution when multiple substances are detected simultaneously, reduce interference between adjacent spectral lines, and improve the detection accuracy of the spectrometer.

[0077] In this embodiment of the invention, by setting the light transmission height of the adjustable aperture to be adjustable, the function of adjusting the irradiation intensity according to different samples to be tested is realized, which expands the material detection range of the spectrometer. At the same time, by setting the axis of the light-entry path and the plane where the light-transmitting hole is located to a preset angle not equal to 90°, the dispersion rate of characteristic spectral signals during the detection of multiple substances is effectively improved, the signal density is increased, and the detection accuracy is improved.

[0078] Furthermore, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the methods described in the embodiments of the present invention.

[0079] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.

[0080] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.

[0081] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0082] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.

Claims

1. A light source excitation assembly for a spectrometer, applied to a spectrometer, the spectrometer including a light intake path, characterized in that, The light source excitation component of the spectrometer includes: A placement stage, which cooperates with a clamping component to fix the sample to be tested on the placement stage; The placement stage is provided with a through hole in the middle, and the center of the through hole is coaxial with the center of the bottom excitation component. The sample to be tested completely covers the through hole. An excitation stage is fitted to the bottom of the placement stage. A groove is provided on the excitation stage. One end of the groove facing the light inlet path abuts against an adjustable aperture. A ventilation hole is provided at the bottom of the end of the groove away from the light inlet path. A light inlet hole is provided on the excitation stage corresponding to the light inlet path. The adjustable light barrier is aligned with the through hole of the light-gathering path, and the light transmission height of the adjustable light barrier is adjustable. The bottom excitation component is fixedly disposed in the middle of the groove, and the central axis of the bottom excitation component, the central axis of the groove, and the central axis of the adjustable aperture are located in the same plane; The axis of the light-gathering path is set at a preset angle to the plane where the light-gathering aperture is located. The preset angle is determined according to a preset dispersion rate and is not equal to 90°.

2. The light source excitation assembly of the spectrometer according to claim 1, characterized in that, The groove includes an excitation groove corresponding to the bottom excitation component, a light guide groove that abuts against the light inlet path, and a dust removal groove. The excitation groove, the light guide groove, and the dust removal groove are integrally formed. The light guide groove abuts against the adjustable light bar, and the dust removal groove is provided with the ventilation hole. The first distance between the ventilation hole and the bottom excitation component is greater than the second distance between the adjustable light bar and the bottom excitation component; The excitation groove includes an excitation through hole and a support portion. The bottom excitation component is disposed through the excitation through hole, and the top of the bottom excitation component is higher than the edge of the groove and lower than the top of the support portion.

3. The light source excitation assembly of the spectrometer according to claim 2, characterized in that, The excitation tank also includes a first air outlet, which is disposed facing the excitation through hole and the dust removal tank; The dust removal tank includes an arc-shaped channel, and the excitation tank is connected to the ventilation hole through the arc-shaped channel; The ventilation hole is not located on the connecting line between the adjustable light bar and the through hole.

4. The light source excitation assembly of the spectrometer according to claim 3, characterized in that, A second air outlet is provided at the top of the light-gathering path; The first air outlet sprays inert gas at a first air flow rate, and the second air outlet sprays inert gas at a second air flow rate, wherein the first air flow rate is less than the second air flow rate.

5. The light source excitation assembly of the spectrometer according to claim 2, characterized in that, The light guide groove includes an integrally formed horizontal light limiting groove and an inclined light guide groove; The horizontal light-limiting groove includes two parallel light-guiding sides, and the inclined light-guiding groove includes two inclined dustproof sides. The vertical projection of the inclined dustproof side is a trapezoid. The bottom edge of the trapezoid is connected to the excitation groove, and the top edge is connected to the parallel light-guiding sides. The parallel light-guiding sides extend from the inclined dustproof sides to the adjustable light bar. One end of the inclined light guide groove is connected to the bottom of the excitation groove, and the other end is connected to the bottom of the adjustable light bar.

6. The light source excitation assembly of the spectrometer according to claim 1, characterized in that, The adjustable aperture includes an upper adjustable aperture and a lower adjustable aperture, which are respectively bolted to the excitation stage.

7. The light source excitation assembly of the spectrometer according to claim 1, characterized in that, Multiple metal wires are arranged around the bottom of the excitation stage. The multiple metal wires are respectively connected to the grounding terminal to form a Faraday cage structure. The number of metal wires is determined according to the target electromagnetic interference outside the Faraday cage structure. The bottom excitation component is located within the Faraday cage structure; A metal connecting plate is also provided on the side of the excitation stage, and the metal connecting plate is grounded.

8. The light source excitation assembly of the spectrometer according to claim 1, characterized in that, It also includes a method for adjusting the adjustable light bar, the method for adjusting the adjustable light bar including: Perform initial position configuration on the adjustable light bar; Acquire the characteristic spectral signal passing through the adjustable aperture at the initial position; Obtain clutter information from the characteristic spectral signal; The height adjustment information of the adjustable light bar is determined based on the clutter information. The light transmission height of the adjustable light bar is adjusted based on the height adjustment information.

9. The light source excitation assembly of the spectrometer according to claim 1, characterized in that, It also includes a method for debugging the optical path, the method for debugging the optical path comprising: Identify the substance to be detected and obtain its characteristic spectral curve. The expected spectral resolution of the characteristic spectral signal is determined based on the characteristic spectral curve. Determine the corresponding grating dispersion rate based on the expected spectral resolution; The preset angle between the light-gathering path and the plane containing the light-transmitting hole is determined based on the grating dispersion rate. Adjust the light intake path based on the preset angle.

10. The light source excitation assembly of the spectrometer according to claim 9, characterized in that, The method for adjusting the optical path also includes: Perform spectral overlap analysis on the characteristic spectral curves to generate spectral overlap information; Based on the spectral overlap information, nearby interfering spectral lines are determined; The dispersion rate of the grating is optimized based on the adjacent interference spectral lines to generate an optimized dispersion rate; The optimized preset angle is determined based on the optimized dispersion rate.

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