Real-time automatic calibration device and method for spectrograph

Abstract

The invention provides a real-time automatic calibration device and method for a spectrograph, and belongs to the technical field of spectrograph calibration testing. The calibration device comprises: a housing; the optical fiber assembly is used for providing an optical signal required by correction; the calibration switching assembly is used for linearly adjusting the position of the optical fiber assembly so as to provide different optical signals; the reflector assembly is used for adjusting the optical path direction of the optical signal; the rotary grating assembly is used for carrying out wavelength scanning on the optical signals; the detector is used for collecting spectral data; the self-correction assembly is arranged on a reflection light path of the reflector assembly, the self-correction assembly is located between the reflector assembly and the detector, and the self-correction assembly is used for shielding the exit slit to obtain background stray light data; and the control assembly is electrically connected with the calibration switching assembly, the rotary grating assembly, the detector and the self-correction assembly. According to the real-time automatic calibration device for the spectrograph, the calibration efficiency and the calibration precision are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of spectrometer calibration and testing, and in particular to a real-time automatic calibration device and method for a spectrometer. Background Art

[0002] Spectral resolution is the wavelength width at which the spectrometer reaches 50% of its maximum spectral response. The purpose of spectral calibration is to determine the center wavelength and bandwidth of each band of the spectrometer. Due to the high spectral resolution of spectrometers, spectrometers have relatively high requirements for spectral calibration. However, high-resolution spectrometers have many bands, and manually calibrating multiple bands one by one is time-consuming and cumbersome. Furthermore, when manually switching between the calibration fiber and the test fiber, assembly differences lead to repeated adjustments, extending the calibration time. During the calibration process, factors such as ambient temperature changes and insufficient light source stability may cause changes in system parameters. Manual calibration cannot make real-time corrections, affecting calibration accuracy and resulting in low repeatability of calibration results.

[0003] In order to solve the above problems, a method and device for real-time automatic calibration of spectrometer were designed. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method and device for real-time automatic calibration of a spectrometer, thereby improving the calibration efficiency and accuracy.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A real-time automatic calibration device for a spectrometer, comprising: case; an optical fiber assembly movably disposed on a side wall of the housing, the optical fiber assembly being used to provide an optical signal required for calibration; A calibration switch assembly is provided on an inner wall of one side of the housing, the optical fiber assembly is mounted on the calibration switch assembly, and the calibration switch assembly is used to linearly adjust the position of the optical fiber assembly to provide different optical signals; a reflector assembly, provided on the outgoing optical path of the optical fiber assembly, the reflector assembly being used to adjust the optical path direction of the optical signal; a rotating grating assembly, disposed on a reflective light path within the reflector assembly, the rotating grating assembly being used to perform wavelength scanning on the optical signal; A detector is provided on an outer wall of one side of the housing, the detector is located in the reflected light path of the reflector assembly, and the detector is used to collect spectral data; A self-correction component is provided on the reflection light path of the reflector component, the self-correction component is located between the reflector component and the detector, and the self-correction component is used to block the exit slit to obtain background stray light data; A control component is electrically connected to the calibration switching component, the rotating grating component, the detector and the self-correction component respectively.

[0006] In an exemplary embodiment of the present disclosure, the optical fiber assembly includes a calibration optical fiber and a test optical fiber; A guide hole is provided on one side wall of the shell, and one end of the calibration optical fiber and the test optical fiber passes through the guide hole and is connected to the calibration switching component. The calibration switching component can adjust the positions of the calibration optical fiber and the test optical fiber to provide different optical signals.

[0007] In an exemplary embodiment of the present disclosure, the optical fiber assembly further includes a calibration light source, which is disposed on the housing, and the other end of the calibration optical fiber is connected to the calibration light source.

[0008] In an exemplary embodiment of the present disclosure, the calibration switching component includes: A stepper motor linear assembly is provided on the inner wall of the housing, and the stepper motor linear assembly is located on one side of the guide hole; A calibration frame is provided on the stepper motor linear assembly, the calibration optical fiber and the test optical fiber are connected to the calibration frame, and the stepper motor linear assembly can drive the calibration frame to move along the extension direction of the guide hole; A sealing plate is provided at one end of the calibration frame close to the guide hole, an O-ring is provided on the side wall of the sealing plate close to the guide hole, and the sealing plate and the O-ring are used to dynamically seal the guide hole; The calibration frame is a cavity structure, and is provided with an opening at one end away from the guide hole. The cavity is divided into two cavities by an isolation plate, and the calibration optical fiber and the test optical fiber extend into the two cavities respectively.

[0009] In an exemplary embodiment of the present disclosure, one end of the calibration optical fiber and the test optical fiber extending into the calibration frame is respectively provided with a slit seat, and the slit seat is sealed to the calibration frame.

[0010] In an exemplary embodiment of the present disclosure, an aperture piece is provided on the slit seat.

[0011] In an exemplary embodiment of the present disclosure, a fixing bracket is provided on an inner wall of one side of the shell, a photoelectric switch is provided on the fixing bracket, and a light shielding plate adapted to the photoelectric switch is provided on the calibration bracket.

[0012] In an exemplary embodiment of the present disclosure, the reflector assembly includes a first reflector and a second reflector; The first reflector is non-perpendicularly arranged on the outgoing light path of the optical fiber assembly, the rotating grating assembly is arranged on the reflected light path of the first reflector, the second reflector is non-perpendicularly arranged on the outgoing light path after the rotating grating assembly processes the optical signal, and the self-correction assembly and the detector are arranged in sequence on the reflected light path of the second reflector.

[0013] A method for real-time automatic calibration of a spectrometer, using any of the above-mentioned real-time automatic calibration devices for a spectrometer to perform automatic calibration, comprising: Step S1: pre-set calibration parameters; Step S2: Start the calibration light source, select the calibration optical fiber through the calibration switching component, and the calibration optical fiber emits an optical signal; Step S3: rotating the rotating grating assembly to the starting wavelength position, blocking the exit slit with the self-correction assembly, and acquiring background stray light data with the detector; Step S4: the self-correction component moves away from the exit slit, the exit light of the calibration fiber passes through the exit slit and enters the detector, the rotating grating component scans from the starting wavelength to the ending wavelength, and the spectral response data of the first band is obtained; Step S5: adjusting the light source intensity according to the peak DN value of the spectral response data, repeating step S4 until the DN value reaches a preset threshold, and recording the current spectral curve; Step S6: completing the acquisition of spectral curves of all bands in sequence, and subtracting the background stray light data from the spectral curve of each band to obtain a corrected spectral response curve; Step S7: After the calibration is completed, the test fiber is selected through the calibration switching component, and the rotating grating component is started to complete the spectrum acquisition.

[0014] In an exemplary embodiment of the present disclosure, in step S1, the calibration parameters include a starting wavelength, an ending wavelength, a scanning step length, and a light source intensity threshold.

[0015] Beneficial effects of the present disclosure: (1) In the present disclosure, the calibration switching component is used to realize the automatic switching between the calibration fiber and the test fiber, thereby avoiding the assembly differences and time waste caused by manual operation and shortening the calibration time.

[0016] (2) In the present disclosure, the exit slit is blocked by a self-correcting component, background stray light data is obtained through a detector, and background interference is subtracted in real time from subsequent spectral data, thereby effectively eliminating the influence of ambient stray light and improving the accuracy of the spectral response curve.

[0017] (3) In this disclosure, the intensity of the light source is automatically adjusted to reach saturation based on the DN value feedback output by the detector, ensuring that the signal intensity of each band is consistent and avoiding calibration errors caused by unstable light intensity.

[0018] (4) The present invention can automatically complete full-band scanning according to preset parameters (starting wavelength, ending wavelength, scanning step, light source intensity threshold) without the need for manual adjustment of each band, which is suitable for the multi-band requirements of high-resolution spectrometers.

[0019] (5) In the present disclosure, a planar dynamic seal is formed between the inner wall of the shell and the calibration frame by an O-ring and grease, and a fully enclosed structure is formed by the aperture plate, which effectively isolates external stray light and improves anti-interference capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification, are used to explain the principles of the present disclosure. Obviously, the drawings described below are only some embodiments of the present disclosure, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0021] Figure 1 This is a schematic structural diagram of a real-time automatic calibration device for a spectrometer in one embodiment of the present disclosure; Figure 2 This is a side view of a real-time automatic calibration device for a spectrometer in one embodiment of the present disclosure; Figure 3 This is an assembly diagram of a calibration switching component in one embodiment of the present disclosure; Figure 4 A bottom view of a housing in one embodiment of the present disclosure; Figure 5 This is a structural diagram of a calibration switching component in one embodiment of the present disclosure; Figure 6 This is a right side view of the calibration switch assembly in one embodiment of the present disclosure; Figure 7 This is a front view of a calibration switching assembly in one embodiment of the present disclosure; Figure 8 This is a top view of the calibration switching assembly in one embodiment of the present disclosure.

[0022] Description of reference numerals: 1. Housing; 2. Fiber optic assembly; 3. Calibration switching assembly; 4. Reflector assembly; 5. Rotating grating assembly; 6. Detector; 7. Self-calibration assembly; 8. Calibration fiber; 9. Test fiber; 10. Guide hole; 11. Calibration light source; 12. Stepper motor linear assembly; 13. Calibration frame; 14. Sealing plate; 15. O-ring; 16. Slit seat; 17. Aperture plate; 18. Fixing frame; 19. Photoelectric switch; 20. Light baffle; 21. First reflector; 22. Second reflector; 23. Light shield; 24. Protective cover. DETAILED DESCRIPTION

[0023] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent identical or similar structures, and thus their detailed descriptions will be omitted. Furthermore, the figures are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0024] Although relative terms such as "upper" and "lower" are used in this specification to describe the relationship of one illustrated component to another, these terms are used herein for convenience only, such as in accordance with the orientation of the illustrations in the accompanying drawings. It will be understood that if the illustrated device were flipped upside down, the component described as "upper" would become the component "lower." When a structure is referred to as "on" another structure, this may mean that the structure is integrally formed with the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via the other structure.

[0025] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express open-ended inclusion and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used only as labels and are not intended to limit the quantity of their objects.

[0026] The present disclosure provides a real-time automatic calibration device for a spectrometer. Figure 1, including: a shell 1; an optical fiber component 2, movably arranged on a side wall of the shell 1, the optical fiber component 2 is used to provide the optical signal required for calibration; a calibration switching component 3, arranged on an inner wall of one side of the shell 1, the optical fiber component 2 is installed on the calibration switching component 3, the calibration switching component 3 is used to linearly adjust the position of the optical fiber component 2 to provide different optical signals; a reflector component 4, arranged on the output light path of the optical fiber component 2, the reflector component 4 is used to adjust the optical path direction of the optical signal; a rotating grating component 5, arranged on the reflected light path in the reflector component 4, the rotating grating component 5 is used to scan the wavelength of the optical signal; a detector 6, arranged on the outer wall of one side of the shell 1, the detector 6 is located on the reflected light path of the reflector component 4, the detector 6 is used to collect spectral data; a self-calibration component 7, arranged on the reflected light path of the reflector component 4, the self-calibration component 7 is located between the reflector component 4 and the detector 6, the self-calibration component 7 is used to block the output slit to obtain background stray light data; a control component, the control component is electrically connected to the calibration switching component 3, the rotating grating component 5, the detector 6 and the self-calibration component 7 respectively.

[0027] In the embodiment of the present disclosure, the real-time automatic calibration device of the spectrometer is composed of a housing 1, an optical fiber component 2, a calibration switching component 3, a reflector component 4, a rotating grating component 5, a detector 6, a self-calibration component 7 and a control component, wherein the optical fiber component 2 and the detector 6 are installed on a side wall of the housing 1, the detector 6 is located on one side of the optical fiber component 2, the optical fiber component 2 can move on the side wall of the housing 1, the calibration switching component 3, the reflector component 4, the rotating grating component 5, the self-calibration component 7 and the control component are installed in the housing 1, the optical fiber component 2 is connected to the calibration switching component 3, the reflector component 4 is located on the outgoing light path of the optical fiber component 2, the rotating grating component 5 is located on the reflected light path in the reflector component 4, and the self-calibration component 7 is provided. The positive component 7 and the detector 6 are sequentially located on the reflected light path of the reflector component 4; the position of the optical fiber component 2 is linearly adjusted by the calibration switching component 3 to output different optical signals, the optical path direction of the optical signal is adjusted by the reflector component 4, the wavelength of the optical signal adjusted by the reflector component 4 is scanned by rotating the grating component 5, the reflector component 4 adjusts the optical path direction of the scanned optical signal again, the exit slit is blocked by the self-correction component 7, the background stray light data is obtained by the detector 6, and then the exit slit is released by the self-correction component 7, and the spectral response data of the first band is obtained by the detector 6; the spectral response data of all bands are obtained in sequence, and the background stray light data is subtracted to obtain the corrected spectral response curve.

[0028] Compared with the existing manual calibration method, the real-time automatic calibration device of the spectrometer automatically adjusts the position of the optical fiber component through the calibration switching component, outputs different optical signals, avoids the assembly differences and time waste of manual operation, and shortens the calibration time; blocks the exit slit through the self-correction component, obtains background stray light data through the detector, and subtracts background interference in real time from the subsequent spectral data, effectively eliminating the influence of ambient stray light and improving the accuracy of the spectral response curve.

[0029] In one embodiment of the present disclosure, see Figure 1 and Figure 2 Fiber assembly 2 includes a calibration fiber 8 and a test fiber 9. A guide hole 10 is defined in a side wall of housing 1. One end of each fiber passes through guide hole 10 and connects to calibration switch assembly 3. Calibration switch assembly 3 adjusts the positions of calibration fiber 8 and test fiber 9 to provide different optical signals. This facilitates switching between calibration fiber 8 and test fiber 9, eliminating manual assembly errors and time-consuming operations, and shortening calibration time.

[0030] It can be understood that the control component starts the calibration switching component 3, drives the calibration optical fiber 8 and the test optical fiber 9 to move in the guide hole 10, adjusts the positions of the calibration optical fiber 8 and the test optical fiber 9, realizes automatic switching of the calibration optical fiber 8 and the test optical fiber 9, and outputs different optical signals to the reflector component 4.

[0031] In one embodiment of the present disclosure, see Figure 4 The optical fiber assembly 2 further includes a calibration light source 11, which is disposed on the housing 1. The other end of the calibration optical fiber 8 is connected to the calibration light source 11. In this way, the calibration optical fiber 8 can transmit an optical signal into the spectrometer to facilitate calibration.

[0032] Optionally, the output intensity of the calibration light source 11 is adjustable.

[0033] Optionally, the calibration light source 11 is electrically connected to the control component, so that the light source intensity of the calibration light source 11 can be automatically adjusted to maintain the consistency of the signal intensity of each band and avoid calibration errors caused by unstable light intensity.

[0034] Optionally, the number of the calibration light source 11 is at least one.

[0035] In one embodiment of the present disclosure, see Figures 5 to 8The calibration switching assembly 3 includes a stepper motor linear assembly 12, mounted on the inner wall of the housing 1 and positioned on one side of the guide hole 10; and a calibration frame 13, mounted on the stepper motor linear assembly 12. The calibration fiber 8 and the test fiber 9 are connected to the calibration frame 13. The stepper motor linear assembly 12 is capable of driving the calibration frame 13 to move along the extension direction of the guide hole 10. This allows for automatic and stable switching between the calibration fiber 8 and the test fiber 9, avoiding assembly discrepancies and time waste associated with manual operation, and improving calibration accuracy and efficiency.

[0036] Alternatively, see Figures 5 to 7 The calibration switching assembly 3 further includes a sealing plate 14, which is disposed at one end of the calibration frame 13 near the guide hole 10. An O-ring 15 is disposed on the sidewall of the sealing plate 14 near the guide hole 10. The sealing plate 14 and the O-ring 15 are used to dynamically seal the guide hole 10. This improves the sealing of the guide hole 10, prevents stray light from entering the housing 1, and enhances anti-interference capabilities.

[0037] Optionally, grease is applied between the sealing plate 14 and the inner wall of the housing 1. In this way, a planar dynamic seal can be achieved for the guide hole 10, which facilitates the movement of the sealing plate 14 along the inner wall of the housing 1 and improves the sealing effect of the sealing plate 14 and the O-ring 15 on the guide hole 10.

[0038] Alternatively, see Figure 6 Calibration frame 13 is a hollow structure with an opening at one end away from guide hole 10. This cavity is divided into two chambers by a partition plate, into which calibration fiber 8 and test fiber 9 extend, respectively. This separates the exit ends of calibration fiber 8 and test fiber 9, preventing interference between them.

[0039] Optionally, the stepper motor linear assembly 12 includes a guide rail, which is arranged on the inner wall of the shell 1, and a stepper motor is arranged at one end of the guide rail. A screw rod is rotatably installed in the guide rail, and one end of the screw rod extends out of the guide rail and is connected to the output end of the stepper motor. The calibration frame 13 is slidably installed on the guide rail, and the screw rod passes through the calibration frame 13 and is threadedly connected to the calibration frame 13.

[0040] In one embodiment of the present disclosure, see Figure 6 The ends of the calibration fiber 8 and the test fiber 9 extending into the calibration frame 13 are each provided with a slit seat 16, which is sealed to the calibration frame 13; and an aperture plate 17 is provided on the slit seat 16. This creates a fully enclosed structure, isolating external stray light and improving anti-interference capabilities.

[0041] In one embodiment of the present disclosure, see Figure 5 、 Figure 6 and Figure 8A fixing bracket 18 is provided on the inner wall of one side of the housing 1, and a photoelectric switch 19 is provided on the fixing bracket 18. A light shield 20 adapted to the photoelectric switch 19 is provided on the calibration bracket 13. In this way, the position of the calibration switching assembly 3 can be detected, and the optical signals emitted by the calibration optical fiber 8 and the test optical fiber 9 can be accurately transmitted to the reflector assembly 4, avoiding optical path deviation.

[0042] It can be understood that the photoelectric switch 19 cooperates with the calibration switching assembly 3. Through the cooperation between the photoelectric switch 19 and the light baffle 20, the position signal of the calibration frame 13 is detected, so that the calibration optical fiber 8 and the test optical fiber 9 are accurately aligned with the reflector assembly 4 when switching, avoiding the optical path deviation due to mechanical deviation. At the same time, the movement of the calibration frame 13 is limited to avoid damage to the calibration optical fiber 8 and the test optical fiber 9 due to excessive movement range.

[0043] In one embodiment of the present disclosure, see Figure 1 Reflector assembly 4 includes a first reflector 21 and a second reflector 22. First reflector 21 is arranged non-perpendicularly on the outgoing optical path of optical fiber assembly 2, rotating grating assembly 5 is arranged on the reflected optical path of first reflector 21, and second reflector 22 is arranged non-perpendicularly on the outgoing optical path after the optical signal is processed by rotating grating assembly 5. Self-correction assembly 7 and detector 6 are arranged in sequence on the reflected optical path of second reflector 22. In this way, the optical signal emitted by optical fiber assembly 2 can be conveniently transmitted to rotating grating assembly 5, and the optical signal processed by rotating grating assembly 5 can be conveniently transmitted to detector 6 for detection.

[0044] Optionally, surfaces of the first reflector 21 and the second reflector 22 are both coated with a high reflective film.

[0045] In one embodiment of the present disclosure, the rotating grating assembly 5 includes a grating tower wheel and a motor. The grating is mounted on the grating tower wheel, and the motor is used to drive the grating tower wheel to rotate to adjust the angle of the grating.

[0046] In one embodiment of the present disclosure, see Figure 3 and Figure 4 A detachable light shield 23 is mounted on one side of the housing 1 and snaps onto the guide hole 10. Two threading holes are defined on one side of the light shield 23. The calibration fiber 8 and the test fiber 9 extend through the threading holes into the light shield 23, then through the guide hole 10 into the housing 1 and connect to the calibration switching assembly 3. This prevents stray light from entering the housing 1, improving anti-interference capabilities.

[0047] Optionally, the calibration optical fiber 8 and the test optical fiber 9 are connected to the light shield 23 via an optical fiber adapter.

[0048] Optionally, the threading hole is opened on the side wall of the light shield 23 perpendicular to the housing 1 .

[0049] Optionally, the surface of the light shield 23 is coated with matte paint.

[0050] In one embodiment of the present disclosure, see Figure 3 A protective cover 24 is detachably mounted on the inner wall of one side of the housing 1. The protective cover 24 is fastened to the calibration switch assembly 3. A light exit hole corresponding to the optical fiber assembly 2 is formed on the side wall of the light shield 23 near the reflector assembly 4. In this way, the calibration switch assembly 3 can be protected.

[0051] Optionally, there are two light exit holes, which correspond to the calibration optical fiber 8 and the test optical fiber 9 respectively.

[0052] In one embodiment of the present disclosure, the detector 6 is a CCD camera.

[0053] In one embodiment of the present disclosure, the self-calibration assembly 7 includes a reflector lens for blocking the exit slit, a drive motor for driving the reflector lens, and a position sensor for detecting the position of the reflector lens. This allows the position of the reflector lens to be adjusted, switching between blocking and unlocking the exit slit, thereby facilitating the acquisition of background stray light data and spectral response data.

[0054] Optionally, an exit slit is provided in the housing 1 , and the exit slit is located between the self-correction component 7 and the detector 6 , and the light signal reflected by the reflector component 4 is incident on the detector 6 through the exit slit.

[0055] The present disclosure provides a method for real-time automatic calibration of a spectrometer. Figures 1 to 8 , using the spectrometer real-time automatic calibration device described in any of the above embodiments to perform automatic calibration, including: Step S1: pre-set calibration parameters; Step S2: Start the calibration light source 11, select the calibration optical fiber 8 through the calibration switching component 3, and the calibration optical fiber 8 emits an optical signal; Step S3: rotating the rotating grating component 5 to the starting wavelength position, shielding the exit slit by the self-correction component 7, and acquiring background stray light data by the detector 6; Step S4: The self-correction component 7 moves away from the exit slit, the output light of the calibration fiber 8 passes through the exit slit and enters the detector 6, and the rotating grating component 5 scans from the starting wavelength to the ending wavelength to obtain the spectral response data of the first wavelength band; Step S5: adjusting the light source intensity according to the peak DN value of the spectral response data, repeating step S4 until the DN value reaches a preset threshold, and recording the current spectral curve; Step S6: completing the acquisition of spectral curves of all bands in sequence, and subtracting the background stray light data from the spectral curve of each band to obtain a corrected spectral response curve; Step S7: After the calibration is completed, the test fiber 9 is selected through the calibration switching component 3, and the rotating grating component 5 is started to complete the spectrum acquisition; In step S1 , the calibration parameters include a starting wavelength, an ending wavelength, a scanning step length, and a light source intensity threshold.

[0056] In the embodiment of the present disclosure, when calibration is required, the parameters of the starting wavelength, ending wavelength, scanning step length and light source intensity threshold are set in advance by the control component, the calibration light source 11 is started, the calibration optical fiber 8 emits a light signal, the stepper motor linear component 12 is started, the calibration frame 13 is driven to move along the guide hole 10, and the calibration optical fiber 8 is driven to move in the guide hole 10, so that the light signal emitted by the calibration optical fiber 8 is transmitted to the first reflector 21 through the light exit hole, and when the photoelectric switch 19 detects that the calibration frame 13 has moved to the correct position, the stepper motor linear component 12 is turned off; the first reflector 21 reflects the light signal to the rotating grating component 5, and the motor drives the grating tower wheel to rotate so that the grating rotates to the starting wavelength position, and the grating performs wavelength scanning on the light signal. The scanned light signal is transmitted to the second reflector 22, and the second reflector 22 reflects the light signal to the exit slit; the drive motor is started to drive the reflector lens to rotate, and the reflector lens is blocked in front of the exit slit, and the display data of the detector 6 is read to obtain background stray light data; the motor is driven again to drive the reflector lens to rotate. The reflector lens rotates in the opposite direction to release the blocking of the reflector lens on the exit slit, and the light signal emitted by the calibration fiber 8 is incident on the detector 6 through the exit slit. The motor drives the grating tower wheel to rotate, so that the grating scans from the starting wavelength to the ending wavelength to obtain the spectral response data of the first band; then the intensity of the calibration light source 11 is dynamically adjusted according to the peak DN value of the spectral response data, and the rotating grating component 5 is re-scanned from the starting wavelength to the ending wavelength until the DN value reaches the preset threshold, and the current spectral curve is recorded; then the spectral curve collection of the second band is started until the spectral curve collection of all bands is completed, and the background stray light data of the corresponding band is subtracted from the spectral curves of all bands to obtain the corrected spectral response curve; after the calibration is completed, the calibration light source 11 is turned off, the test fiber 9 is connected to the sample to be tested, and the stepper motor linear component 12 is started again, so that the light signal emitted by the test fiber 9 is transmitted to the first reflector 21 through the light exit hole, and the spectral signal emitted by the test fiber 9 is collected by rotating the grating component 5.

[0057] In one embodiment of the present disclosure, the calibration process can be performed automatically and regularly, and the calibration process does not affect the continuous progress of sample testing.

[0058] Optionally, the interval time of the calibration process is 10 minutes.

[0059] In one embodiment of the present disclosure, the light source intensity is adjusted through a closed-loop feedback control system. If the DN value of the current band has not reached saturation, the light source output is dynamically adjusted and re-scanned from the starting wavelength to the ending wavelength.

[0060] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

Claims

1. A real-time automatic calibration device for a spectrometer, characterized in that: include: housing (1); An optical fiber assembly (2) is movably arranged on a side wall of the housing (1), and the optical fiber assembly (2) is used to provide an optical signal required for correction; A calibration switching component (3) is provided on an inner wall of one side of the housing (1); the optical fiber component (2) is mounted on the calibration switching component (3); and the calibration switching component (3) is used to linearly adjust the position of the optical fiber component (2) to provide different optical signals; A reflector assembly (4) is provided on the outgoing light path of the optical fiber assembly (2), and the reflector assembly (4) is used to adjust the light path direction of the optical signal; A rotating grating component (5) is provided on the reflection light path in the reflector component (4), and the rotating grating component (5) is used to perform wavelength scanning on the optical signal; A detector (6) is provided on an outer wall of one side of the housing (1), the detector (6) is located on the reflected light path of the reflector assembly (4), and the detector (6) is used to collect spectral data; A self-correction component (7) is provided on the reflection light path of the reflector component (4), the self-correction component (7) is located between the reflector component (4) and the detector (6), and the self-correction component (7) is used to block the exit slit to obtain background stray light data; A control component is electrically connected to the calibration switching component (3), the rotating grating component (5), the detector (6), and the self-calibration component (7).

2. The real-time automatic calibration device for a spectrometer according to claim 1, characterized in that: The optical fiber assembly (2) includes a calibration optical fiber (8) and a test optical fiber (9); A guide hole (10) is provided on one side wall of the housing (1), and one end of the calibration optical fiber (8) and the test optical fiber (9) passes through the guide hole (10) and is connected to the calibration switching component (3). The calibration switching component (3) can adjust the positions of the calibration optical fiber (8) and the test optical fiber (9) to provide different optical signals.

3. The real-time automatic calibration device for a spectrometer according to claim 2, characterized in that: The optical fiber assembly (2) further comprises a calibration light source (11), the calibration light source (11) being arranged on the housing (1), and the other end of the calibration optical fiber (8) being connected to the calibration light source (11).

4. The real-time automatic calibration device for a spectrometer according to claim 2, characterized in that: The calibration switching component (3) comprises: A stepper motor linear assembly (12) is provided on the inner wall of the housing (1), and the stepper motor linear assembly (12) is located on one side of the guide hole (10); A calibration frame (13) is arranged on the stepper motor linear assembly (12), the calibration optical fiber (8) and the test optical fiber (9) are connected to the calibration frame (13), and the stepper motor linear assembly (12) can drive the calibration frame (13) to move along the extension direction of the guide hole (10); A sealing plate (14) is provided at one end of the calibration frame (13) close to the guide hole (10), an O-ring (15) is provided on the side wall of the sealing plate (14) close to the guide hole (10), and the sealing plate (14) and the O-ring (15) are used to dynamically seal the guide hole (10); The calibration frame (13) is a cavity structure, and the calibration frame (13) is provided with an opening at one end away from the guide hole (10). The cavity is divided into two cavities by an isolation plate, and the calibration optical fiber (8) and the test optical fiber (9) extend into the two cavities respectively.

5. The real-time automatic calibration device for a spectrometer according to claim 4, characterized in that: One end of the calibration optical fiber (8) and the test optical fiber (9) extending into the calibration frame (13) is respectively provided with a slit seat (16), and the slit seat (16) is sealedly connected to the calibration frame (13).

6. The real-time automatic calibration device for a spectrometer according to claim 5, characterized in that: A diaphragm piece (17) is provided on the slit seat (16).

7. The real-time automatic calibration device for a spectrometer according to claim 4, characterized in that: A fixing frame (18) is provided on an inner wall of one side of the housing (1), a photoelectric switch (19) is provided on the fixing frame (18), and a light shielding plate (20) adapted to the photoelectric switch (19) is provided on the calibration frame (13).

8. The real-time automatic calibration device for a spectrometer according to claim 1, characterized in that: The reflector assembly (4) comprises a first reflector (21) and a second reflector (22); The first reflector (21) is non-perpendicularly arranged on the outgoing light path of the optical fiber component (2), the rotating grating component (5) is arranged on the reflected light path of the first reflector (21), the second reflector (22) is non-perpendicularly arranged on the outgoing light path after the rotating grating component (5) processes the optical signal, and the self-correction component (7) and the detector (6) are sequentially arranged on the reflected light path of the second reflector (22).

9. A real-time automatic calibration method for a spectrometer, characterized in that: Automatic calibration is performed using the real-time automatic calibration device for a spectrometer according to any one of claims 1 to 8, comprising: Step S1: pre-set calibration parameters; Step S2: starting the calibration light source (11), selecting the calibration optical fiber (8) through the calibration switching component (3), and the calibration optical fiber (8) emits an optical signal; Step S3: rotating the rotating grating component (5) to the starting wavelength position, shielding the exit slit by the self-correction component (7), and acquiring background stray light data by using the detector (6); Step S4: the self-correction component (7) moves away from the exit slit, the exit light of the calibration optical fiber (8) passes through the exit slit and enters the detector (6), the rotating grating component (5) scans from the starting wavelength to the ending wavelength, and the spectral response data of the first band is obtained; Step S5: adjusting the light source intensity according to the peak DN value of the spectral response data, repeating step S4 until the DN value reaches a preset threshold, and recording the current spectral curve; Step S6: completing the acquisition of spectral curves of all bands in sequence, and subtracting the background stray light data from the spectral curve of each band to obtain a corrected spectral response curve; Step S7: After the calibration is completed, the test optical fiber (9) is selected through the calibration switching component (3), and the rotating grating component (5) is started to complete the spectrum acquisition.

10. The real-time automatic calibration method for a spectrometer according to claim 9, characterized in that: In step S1, the calibration parameters include a starting wavelength, an ending wavelength, a scanning step length, and a light source intensity threshold.

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