Sampling and adjusting device, method and system for spectrograph photoelectric signals

Abstract

The invention provides a spectrograph photoelectric signal sampling adjusting device, method and system. The method comprises the following steps: continuously distributed optical signals are formed on the same plane; the movable detection assembly comprises a single-point type photoelectric detector and a motion driving assembly, the single-point type photoelectric detector is used for collecting optical signals and converting the optical signals into electric signals, and the single-point type photoelectric detector is arranged on the motion driving assembly; the motion driving assembly drives the single-point type photoelectric detector to move in the horizontal direction, so that the single-point type photoelectric detector collects optical signals located on the same plane; the system further comprises a closed-loop control unit. The closed-loop control unit comprises a position feedback unit and a sampling unit. The position feedback unit is used for acquiring current position information of the single-point photoelectric detector and generating a position feedback signal; sampling interval parameters are preset in the sampling unit, and optical signals are collected regularly according to the sampling interval parameters in the moving process of the photoelectric detector.

Description

Technical Field

[0001] This invention relates to the field of spectrometer technology, and in particular to a sampling and adjustment device, method and system for photoelectric signals of a spectrometer. Background Technology

[0002] As a core device for analyzing the optical properties of substances, the photoelectric signal sampling technology of a spectrometer directly affects the accuracy, cost, and applicability of spectral measurements. Currently, photoelectric sampling methods in spectrometers are mainly divided into two categories: Array detector sampling: This uses area or linear array detectors such as CCD and CMOS, which can acquire full-band spectral signals in a single exposure, offering the advantage of fast response speed. However, in special bands, high-performance array detectors rely on imports, resulting in extremely high costs; moreover, the number of pixels in the array detector is fixed, and the spectral resolution is determined by the pixel spacing, making it impossible to flexibly adjust according to actual needs, thus limiting adaptability. Scanning single-detector sampling: This uses a single photodetector, driven by a mechanical structure to move the detector or dispersive element, sequentially acquiring light signals of different wavelengths. Traditional scanning methods often employ open-loop control or timed trigger sampling, whose sampling accuracy is greatly affected by fluctuations in movement speed. For example, unstable motor speed can cause sampling point offset, and the fixed sampling interval makes it difficult to flexibly adjust according to measurement requirements; simultaneously, the lack of a real-time position feedback mechanism easily leads to accumulated errors, resulting in decreased spectral data accuracy. Therefore, existing technologies suffer from problems such as excessively high costs in special bands, sampling accuracy being affected by motion interference, and insufficient flexibility in resolution adjustment. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this invention is to provide a sampling and adjustment device, method and system for the photoelectric signal of a spectrometer, so as to overcome the above-mentioned defects in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A sampling and adjustment device for photoelectric signals of a spectrometer, comprising: A static optical path system is provided, comprising, in sequence, an entrance slit, a collimating lens, a grating, and a focusing lens. The grating disperses the incident light into spectral images arranged along a preset direction, and the focusing lens focuses these spectral images onto a single plane to form a continuously distributed optical signal. The system also includes a movable detection component, comprising a single-point photodetector and a motion drive component. The single-point photodetector is used to collect optical signals and convert them into electrical signals. The single-point photodetector is mounted on the motion drive component, which drives the single-point photodetector to move horizontally, so that the single-point photodetector collects optical signals located on the same plane. It also includes a closed-loop control unit, which includes a position feedback unit and a sampling unit; The position feedback unit is used to acquire the current position information of the single-point photodetector and generate a position feedback signal; The sampling unit is preset with a sampling interval parameter, and the photodetector periodically collects light signals according to the sampling interval parameter during the movement of the photodetector. The information processing unit is used to acquire the electrical signal output by the single-point photodetector and to acquire the position feedback signal corresponding to the single-point photodetector to generate spectral data.

[0005] Preferably, the position feedback unit is a pulse counting device, which records the number of driving pulses of the motion driving component. The sampling interval parameter is a preset number of pulses. When the pulse count reaches the preset number of pulses, the sampling unit triggers sampling.

[0006] Preferably, the position feedback unit is an absolute position sensor, which outputs the real-time coordinates of the single-point photodetector. The sampling interval parameter is a preset interval coordinate. When the difference between the real-time coordinate and the previous sampling coordinate reaches the preset coordinate interval, the sampling unit triggers sampling.

[0007] Preferably, the motion drive assembly has a start position and an end position. The motion drive assembly drives the single-point photodetector to move between the start position and the end position. The closed-loop control unit also includes a reset unit. When the single-point photodetector moves to the end position or the start position, the reset unit receives a position feedback signal and controls the single-point photodetector to stop moving or move in the opposite direction.

[0008] Preferably, the sampling interval parameter is adjustable, and the minimum detection accuracy of the position feedback unit is obtained, and the sampling interval parameter is adjusted according to the minimum detection accuracy.

[0009] A sampling and adjustment method for photoelectric signals from a spectrometer, comprising: The optical path preparation step involves using a static optical path system to disperse and focus the incident light into a spectral image arranged in a preset direction. The moving detection step involves setting the sampling start position, end position, and sampling interval parameters, and driving the single-point photodetector to move from the start position to the end position. The position feedback and sampling steps involve real-time detection of the position feedback signal of the single-point photodetector. When the position of the single-point photodetector meets the sampling interval parameter, the optical signal at the current position is acquired and converted into an electrical signal. The data generation step involves correlating the electrical signals from each sample with the position feedback signals to generate complete spectral data.

[0010] Preferably, the method also includes a calibration step, which uses a characteristic peak spectral light source to collect the optical signal and position signal of the characteristic peak, establishes the correspondence between the positional relationship and the spectral wavelength, and compares it with the standard spectral data of the characteristic peak.

[0011] A sampling and adjustment system for photoelectric signals from a spectrometer, comprising: The spectrometer's photoelectric signal sampling and adjustment device also includes a control terminal and a display unit; The control terminal is used to set the sampling start position, end position, and sampling interval parameters, and to receive the spectral data output by the signal processing unit. The display unit is used to display the spectral data in the form of a wavelength-relative radiant power curve.

[0012] The beneficial effects of this invention are: It uses a single-point photodetector instead of a traditional array detector, reducing hardware costs. Through the coordinated action of the closed-loop control unit and the position feedback unit, sampling triggering based on real-time position feedback signals can effectively offset speed fluctuations or mechanical errors in the motion drive components, ensuring precise correspondence between the sampling point and the preset wavelength position, thus improving the accuracy and repeatability of spectral data. Attached Figure Description

[0013] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a flowchart of the present invention; Figure 3 This is the spectral curve of the present invention.

[0014] Reference numerals: 1. Entrance slit; 2. Collimating lens; 3. Grating; 4. Focusing lens; 5. Single-point photodetector; 6. Motion drive assembly. Detailed Implementation

[0015] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0016] It should be noted that when a component is described as "fixed to" another component, it can be directly on the other component or may have a component in between. When a component is considered "connected to" another component, it can be directly connected to the other component or may have a component in between. When a component is considered "set on" another component, it can be directly set on the other component or may have a component in between. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0018] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings: like Figure 1-3 As shown, the present invention provides a sampling and adjustment device for photoelectric signals of a spectrometer, comprising: The static optical path system includes, in sequence, an entrance slit 1, a collimating lens 2, a grating 3, and a focusing lens 4. The grating 3 disperses the incident light into spectral images arranged along a preset direction, and the focusing lens 4 focuses these spectral images onto a single plane to form a continuously distributed optical signal. It also includes a movable detection component, comprising a single-point photodetector 5 and a motion drive component 6. The single-point photodetector 5 collects the optical signal and converts it into an electrical signal. The single-point photodetector 5 is mounted on the motion drive component 6, which drives the single-point photodetector 5 to move horizontally, allowing it to collect optical signals located on the same plane. The entrance slit 1 is located within the optical path. At the very front, the beam width and direction of the incident light are limited, converting the polychromatic light into a narrow beam that approximates a "point source," reducing stray light interference and providing uniform incident conditions for subsequent dispersion. The collimating lens 2 receives the diverging beam from the incident slit 1 and converts it into parallel light. The grating 3 has a large number of equally spaced and equally wide parallel lines engraved on its surface. Utilizing the diffraction phenomenon of the grating, the incident polychromatic light, containing multiple wavelengths, is decomposed into monochromatic light, single-wavelength or narrow-band light, and arranged in an orderly manner in space according to wavelength or frequency to form a spectrum. The focusing lens 4 focuses the parallel light of different wavelengths dispersed by the grating 3 onto the same plane, so that the spectral images separated along the angle form a continuous spatial distribution on this plane. The movable detection component includes a single-point photodetector 5 and a motion drive component 6. The single-point photodetector 5 uses a miniaturized photoelectric conversion element, and its photosensitive surface size is much smaller than the spot size corresponding to a single wavelength in the spectral image, which can be regarded as a "point sampling" unit. Its function is to convert the light signal illuminating the photosensitive surface into a corresponding electrical signal, realizing a single conversion between light and electrical signals. The motion drive component 6 drives the single-point photodetector 5 to move linearly along the arrangement direction of the spectral image, so that the photosensitive surface of the detector sequentially scans the continuous spectral image on the focal plane—that is, it gradually moves from the short wavelength end of the spectrum to the long wavelength end, or vice versa, thereby realizing point-by-point acquisition of the entire spectrum. The static optical path system ensures that the position of the spectral image on the focal plane is stable and continuously distributed; the motion drive component 6 drives the point detector to move along the arrangement direction of the spectral image, and its movement trajectory is strictly parallel to the distribution direction of the spectral image, ensuring that the detector sequentially passes through the light spot position corresponding to each wavelength; the sampling timing of the point detector is precisely matched with the movement position, that is, every time it moves to a preset position, the detector collects the light signal at that position, and finally, a complete spectral data is formed by stitching together multiple sampling points.

[0019] It also includes a closed-loop control unit, which includes a position feedback unit and a sampling unit; The position feedback unit is used to acquire the current position information of the single-point photodetector 5 and generate a position feedback signal; it acquires the position information of the single-point photodetector 5 in real time and generates a position feedback signal.

[0020] The position feedback unit is a pulse counting device that records the number of drive pulses from the motion drive component 6. The sampling interval parameter is a preset number of pulses. When the pulse count reaches the preset number of pulses, the sampling unit triggers sampling. The pulse counting device consists of a motor driver, a pulse counter, and a signal processing module. Its core function is to indirectly calculate the real-time position of the single-point photodetector 5 by recording the number of drive pulses from the motion drive component 6. Each time the motor receives a drive pulse, it will rotate at a fixed angle, which can be converted into linear displacement of the detector through the transmission structure. For example, if the lead screw has a lead of 2mm, one rotation of the motor corresponds to a 2mm movement of the detector. The pulse counter accumulates the total number of pulses received by the motor in real time. Combined with the motor parameters and transmission parameters, the current position of the detector can be calculated using a formula. The sampling interval parameter is preset to a "pulse count threshold". When the number of pulses accumulated by the pulse counting device reaches this threshold, the sampling trigger unit immediately sends a trigger signal to control the single-point photodetector 5 to collect the light signal at the current position. For example, if a single pulse corresponds to a detector movement of 0.015μm, and the preset sampling interval is 100 pulses, then the detector will trigger sampling once every 1.5μm movement.

[0021] The position feedback unit is an absolute position sensor. The absolute position sensor outputs the real-time coordinates of the single-point photodetector 5. The sampling interval parameter is a preset coordinate interval. When the difference between the real-time coordinate and the previous sampling coordinate reaches the preset coordinate interval, the sampling unit triggers sampling. The absolute position sensor is a high-precision device that directly detects the physical position of the detector. It directly outputs the real-time coordinates of the detector on the motion guide rail by reading the sensor scale. The sensor is installed next to the motion guide rail and synchronously moves with the detector's slider, capable of outputting position data with micron-level or even nanometer-level precision in real time. The sampling interval parameter is preset to a "coordinate difference threshold." The absolute position sensor outputs the detector's current coordinates in real time, and the sampling trigger unit continuously calculates the difference between the current coordinate and the previous sampling coordinate. When the difference reaches the preset threshold, sampling is immediately triggered. For example, if the previous sampling coordinate was 10.000 mm and the preset interval is 2 μm, then when the detector moves to 10.002 mm, the next sampling is triggered.

[0022] The sampling unit has a preset sampling interval parameter. During the movement of the photodetector, the light signal is collected periodically according to the sampling interval parameter. The sampling interval parameter reflects the moving distance between two samplings of the single-point photodetector. When a pulse counting device is used, the trigger unit accumulates the number of driving pulses. When the preset number of pulses is reached, a trigger signal is sent immediately and the detector collects the current light signal. When an absolute position sensor is used, the trigger unit calculates the difference between the current coordinate and the previous sampling coordinate. When the preset coordinate interval is reached, a trigger signal is sent immediately and the detector collects the current light signal.

[0023] The information processing unit is used to acquire the electrical signal output by the single-point photodetector 5 and to acquire the corresponding position feedback signal of the single-point photodetector 5 to generate photoelectric converted spectral data. It receives the electrical signal output by the single-point photodetector 5, converts it into a digital signal through analog-to-digital conversion, and records the corresponding sampling timestamp; it synchronously receives the position signal output by the position feedback unit, such as the cumulative pulse count or absolute coordinates, and binds and stores it with the light intensity digital signal to form a "position-light intensity" data pair; and it converts the physical position into the corresponding wavelength through a preset "position-wavelength calibration relationship".

[0024] The motion drive assembly 6 has a start position and an end position. The motion drive assembly 6 drives the single-point photodetector 5 to move between the start position and the end position. The closed-loop control unit also includes a reset unit. When the single-point photodetector 5 moves to the end position or the start position, the reset unit receives the position feedback signal and controls the single-point photodetector 5 to stop moving or move in the opposite direction. The starting and ending positions are the motion boundaries of the single-point photodetector 5. The area between the two points constitutes the "effective sampling interval." The motion drive component 6 only drives the detector to move within this interval, ensuring that the sampling range strictly covers the target spectral band. The reset unit achieves precise control of the detector's motion state by receiving position feedback signals, ensuring that the movement does not exceed the set range. When the single-point photodetector 5 moves to the starting or ending position, the position feedback unit outputs a signal. The reset unit performs operations according to the trigger signal type and preset mode: if a single sampling is completed, the reset unit sends a stop signal, the drive unit is powered off, and the detector stays at the ending position, waiting for the next sampling command; if continuous sampling is required, such as multiple round trips to improve the data signal-to-noise ratio, the reset unit sends a reverse signal, the drive unit reverses, and the detector moves from the ending position to the starting position, or from the starting position to the ending position, and triggers the reverse direction again when it reaches another boundary, forming a reciprocating motion.

[0025] The sampling interval parameter is adjustable, and the minimum detection accuracy of the position feedback unit is obtained. The sampling interval parameter is adjusted according to the minimum detection accuracy. The control terminal automatically reads the hardware parameters of the position feedback unit to determine the minimum detection accuracy value. The adjustable multiple of the sampling interval parameter is 1-N, where N is a positive integer, meaning that the user can only set it to an integer multiple of the minimum detection accuracy.

[0026] A sampling and adjustment method for photoelectric signals from a spectrometer, comprising: The optical path preparation steps involve using a static optical system to disperse and focus the incident light into a spectral image arranged in a preset direction. The light to be tested is incident through an optical fiber or directly onto the entrance slit 1 of the static optical system, where the slit confines the beam into a narrow band beam. The narrow band beam is then converted into parallel light by a collimating lens 2 and illuminates the surface of a grating 3. The grating 3 separates the polychromatic light according to wavelength, with different wavelengths forming angular differences along a preset direction. The dispersed parallel light of each wavelength is then focused onto the same focal plane by a focusing lens 4, forming a spectral image arranged sequentially along the horizontal direction, with each wavelength corresponding to a specific spatial position on the focal plane.

[0027] The motion detection step involves setting the sampling start position, end position, and sampling interval parameters, and driving the single-point photodetector 5 to move from the start position to the end position. Three core parameters are input via the control terminal: the start wavelength of the spectral image corresponding to the start position; the end wavelength of the spectral image corresponding to the end position; and the sampling interval parameter, which sets the positional difference between two samples; a smaller interval results in higher resolution. After receiving the parameters, the motion drive component 6 drives the single-point photodetector 5 to move at a constant speed from the start position along the spectral image alignment direction to the end position. During the movement, the motion drive component 6 maintains a stable speed through closed-loop control.

[0028] The position feedback and sampling process involves real-time detection of the position feedback signal of the single-point photodetector 5. When the position of the single-point photodetector 5 meets the sampling interval parameter, it acquires the light signal at the current position and converts it into an electrical signal. The position feedback unit tracks the current position of the detector in real time: if it is a pulse counting device, it accumulates the number of motor drive pulses and calculates the current displacement through the number of pulses; if it is an absolute position sensor, it directly outputs the real-time coordinates of the detector. The sampling trigger unit compares the real-time position with the preset sampling interval parameter: when the accumulated displacement reaches the interval parameter, it immediately sends a trigger signal. After receiving the trigger signal, the single-point photodetector 5 instantly acquires the light signal at the current position and converts the light intensity into an electrical signal, while simultaneously recording the position feedback signal at the sampling moment.

[0029] The data generation step involves associating the electrical signal from each sample with the position feedback signal to generate complete spectral data. The information processing unit receives the electrical signal from each sample and the corresponding position feedback signal, binding them into "position-intensity" data pairs. Based on a pre-calibrated "position-wavelength relationship table," the position information of each data pair is converted into wavelength information, forming "wavelength-intensity" data pairs. Spectral stitching: All "wavelength-intensity" data pairs are sorted by wavelength from smallest to largest and stitched together to form a complete spectral curve.

[0030] The process also includes a calibration step, employing a characteristic peak spectral light source to collect the optical signals and position signals of the characteristic peaks, establishing the correspondence between position and spectral wavelength, and comparing it with standard spectral data of the characteristic peaks. A standard light source with stable, known characteristic peaks is selected, such as a mercury-argon lamp, a helium-neon laser, or a special wavelength laser source, whose emission spectrum contains multiple sharp characteristic peaks with distinct wavelengths. The optical signal from this light source is introduced into the static optical path system of the device, and after dispersion and focusing, a spectral image containing the characteristic peaks is formed on the focal plane. The dynamic sampling process of the device is initiated, controlling the single-point photodetector 5 to move from the starting position to the ending position, collecting optical signals and corresponding position signals throughout the process. Because the light intensity of the characteristic peak light source is significantly enhanced at specific wavelengths, the information processing unit can identify the peak values ​​of the optical signals corresponding to these peaks and record the detector position corresponding to each peak. Given the characteristic peak wavelength of the standard light source, associate it with the acquired "characteristic peak position" to form a calibration point pair; compare the fitted calibration curve with the standard spectral data of the characteristic peak and calculate the deviation; if the deviation is within the deviation threshold range, the calibration curve is valid; if the deviation is too large, it is necessary to re-check the optical path alignment, sampling accuracy, and other aspects, and repeat the acquisition and correction of the calibration curve until the accuracy requirements are met.

[0031] A sampling and adjustment system for photoelectric signals from a spectrometer, comprising: The spectrometer's photoelectric signal sampling and adjustment device also includes a control terminal and a display unit; The control terminal is used to set the sampling start position, end position, and sampling interval parameters, and to receive spectral data output by the signal processing unit; it provides a visual operation interface for inputting the sampling start position, end position, sampling interval parameters, etc., which are transmitted to the closed-loop control unit of the sampling adjustment device through the communication interface; it receives real-time feedback from the device on detector position, motion status, sampling progress, and other information; and it receives spectral data output by the information processing unit and stores it in a standard format according to user requirements.

[0032] The display unit is used to show spectral data in the form of wavelength-relative radiant power curves. With wavelength on the horizontal axis and relative radiant power on the vertical axis, a complete spectral curve is plotted to intuitively present the wavelength distribution characteristics of the light signal.

[0033] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A sampling and adjustment device for photoelectric signals of a spectrometer, characterized in that, include: A static optical path system is provided, in sequence, with an entrance slit (1), a collimating lens (2), a grating (3), and a focusing lens (4). The grating (3) disperses the incident light into a spectral image arranged along a preset direction, and the focusing lens (4) focuses the spectral image onto the same plane to form a continuously distributed optical signal. The system also includes a movable detection component, which includes a single-point photodetector (5) and a motion drive component (6). The single-point photodetector (5) is used to collect optical signals and convert them into electrical signals. The single-point photodetector (5) is mounted on the motion drive component (6), and the motion drive component (6) drives the single-point photodetector (5) to move in the horizontal direction so that the single-point photodetector (5) collects optical signals located on the same plane. It also includes a closed-loop control unit, which includes a position feedback unit and a sampling unit; The position feedback unit is used to acquire the current position information of the single-point photodetector (5) and generate a position feedback signal; The sampling unit is preset with a sampling interval parameter, and the photodetector periodically collects light signals according to the sampling interval parameter during the movement of the photodetector. The information processing unit is used to acquire the electrical signal output by the single-point photodetector (5) and to acquire the position feedback signal corresponding to the single-point photodetector (5) to generate spectral data.

2. The sampling and adjustment device for photoelectric signals of a spectrometer according to claim 1, characterized in that, The position feedback unit is a pulse counting device, which records the number of driving pulses of the motion driving component (6). The sampling interval parameter is a preset number of pulses. When the pulse count reaches the preset number of pulses, the sampling unit triggers sampling.

3. The sampling and adjustment device for photoelectric signals of a spectrometer according to claim 1, characterized in that, The position feedback unit is an absolute position sensor, which outputs the real-time coordinates of the single-point photodetector (5). The sampling interval parameter is a preset interval coordinate. When the difference between the real-time coordinate and the previous sampling coordinate reaches the preset coordinate interval, the sampling unit triggers sampling.

4. The sampling and adjustment device for photoelectric signals of a spectrometer according to claim 1, characterized in that, The motion drive assembly (6) is provided with a start position and an end position. The motion drive assembly (6) drives the single-point photodetector (5) to move between the start position and the end position. The closed-loop control unit also includes a reset unit. When the single-point photodetector (5) moves to the end position or the start position, the reset unit receives a position feedback signal and controls the single-point photodetector (5) to stop moving or move in the opposite direction.

5. The sampling and adjustment device for photoelectric signals of a spectrometer according to claim 1, characterized in that, The sampling interval parameter is adjustable, and the minimum detection accuracy of the position feedback unit is obtained. The sampling interval parameter is adjusted according to the minimum detection accuracy.

6. A sampling and adjustment method for photoelectric signals of a spectrometer, characterized in that, include: The optical path preparation step involves using a static optical path system to disperse and focus the incident light into a spectral image arranged in a preset direction. The moving detection step sets the sampling start position, end position and sampling interval parameters, and drives the single-point photodetector (5) to move from the start position to the end position; The position feedback and sampling steps involve real-time detection of the position feedback signal of the single-point photodetector (5). When the position of the single-point photodetector (5) meets the sampling interval parameter, the light signal at the current position is collected and converted into an electrical signal. The data generation step involves correlating the electrical signals from each sample with the position feedback signals to generate complete spectral data.

7. The sampling and adjustment method for photoelectric signals of a spectrometer according to claim 6, characterized in that, It also includes a calibration step, which uses a characteristic peak spectral light source to collect the optical signal and position signal of the characteristic peak, establishes the correspondence between the position and the spectral wavelength, and compares it with the standard spectral data of the characteristic peak.

8. A sampling and adjustment system for photoelectric signals of a spectrometer, characterized in that, include: The sampling and adjustment device for the photoelectric signal of the spectrometer as described in any one of claims 1-5; further comprising a control terminal and a display unit; The control terminal is used to set the sampling start position, end position, and sampling interval parameters, and to receive the spectral data output by the signal processing unit. The display unit is used to display the spectral data in the form of a wavelength-relative radiant power curve.

Images