A Spectrometer Control Method and System

Abstract

The present invention discloses a spectrometer control method and system. The method includes the following steps: S1, a spectral acquisition unit acquires spectral data of the measured light; the part of the spectral acquisition unit irradiated by the measured light is the target part, and the part not irradiated is the dummy part; S2, the spectral data of the target part is saved and processed; the data of the dummy part is used as data for background noise deduction. The system of the present invention includes a spectral acquisition unit, a driving circuit, and a data processing module. In the present invention, a spectral acquisition unit with the same photosensitive lateral dimension can effectively acquire spectral information of different focusing dimensions, without the need to replace the spectral acquisition unit and the driving circuit according to the spectral irradiation dimension of the measured light. Therefore, according to the idea of the present invention, the universality of the spectral acquisition unit and its circuit of large, medium, small, and ultra-small spectrometers can be ensured, which is conducive to large-scale production and cost saving.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical analysis equipment, and particularly relates to a spectrometer control method and system. Background Art

[0002] In existing conventional fiber spectrometers, the spectrum of the measured light is focused and imaged on the entire photosensitive surface of the spectrum acquisition unit for detecting the corresponding spectrum. Thus, for spectrometers with different optical focusing structures, spectral irradiation images of different sizes will be generated, so it is required to use spectrum acquisition units with different photosensitive lateral sizes to receive the spectral irradiation images. Thus, in order to adapt to fiber spectrometers with different optical structures, it is necessary to use spectrum acquisition units with different photosensitive lateral sizes and develop and design different circuits. This reduces the versatility of the spectrum acquisition unit and its related circuits, and the corresponding R & D design and production costs are also relatively high. Summary of the Invention

[0003] In order to solve the problems existing in the above-mentioned prior art, the object of the present invention is to provide a spectrometer control method and system, which can improve the versatility and acquisition effect of the spectrum acquisition unit.

[0004] To achieve the above object, the present invention first provides a spectrometer control method, including the following steps:

[0005] S1, the spectrum acquisition unit acquires the spectral data of the measured light; the part of the spectrum acquisition unit irradiated by the measured light is the target part, and the part not irradiated is the dummy part;

[0006] S2, save and process the spectral data of the target part; the data of the dummy part is used as the data for deducting background noise.

[0007] Further, in step S2, the method for processing the spectral data of the target part includes: obtaining the spectral data of the target part in the measured light and calibrating the spectral wavelength of the target part.

[0008] Further, the method for obtaining the spectral data of the target part includes: the data processing module only outputs the spectral data information of the target part according to the setting.

[0009] Further, the method for obtaining the spectral data of the target part includes: the analog-to-digital conversion unit only converts the spectral data information of the target part according to the setting.

[0010] Further, adjust the amplitude of the output signal voltage of the spectrum acquisition unit to match the amplitude of the input signal voltage of the analog-to-digital conversion unit.

[0011] Further, it further includes step S3: display the spectrum of the target part.

[0012] The present invention also provides a spectrometer control system, which adopts the above-mentioned spectrometer control method, and includes:

[0013] A spectrum acquisition unit, which is used to acquire the spectrum data of the measured light. The part of the spectrum acquisition unit irradiated by the measured light is the target part, and the part not irradiated is the dummy part; the target part is used to acquire the spectrum data of the measured light, and the dummy part is used to deduct background noise;

[0014] A drive circuit, which is used to drive and control the spectrum acquisition unit;

[0015] A data processing module, which is used to save and process the spectrum data of the measured light acquired by the spectrum acquisition unit, and control the driving of the spectrum acquisition unit through the drive circuit.

[0016] Further, the data processing module includes:

[0017] An analog-to-digital conversion unit, which is used to convert the analog information of the spectrum acquisition unit into digital information;

[0018] A conditioning circuit, which is used to adjust the amplitude of the output signal voltage of the spectrum acquisition unit to match the amplitude of the input signal voltage of the analog-to-digital conversion unit;

[0019] A control unit, which is used to control the drive circuit of the spectrum acquisition unit, and receive and process the digital information of the analog-to-digital conversion unit.

[0020] Further, the data processing module further includes a storage unit and a clock unit. The storage unit is used to store the spectrum data of the control unit. The data processing module further includes a clock unit, and the clock unit transmits system clock information to the control unit, the analog-to-digital conversion unit, and the spectrum acquisition unit.

[0021] Further, the data processing module further includes a communication unit, and the spectrum data of the control unit is output outward through the communication unit.

[0022] Further, it further includes a display processing unit, and the display processing unit performs data interaction with the data processing module.

[0023] Further, it further includes an optical-mechanical platform, and the measured light is diffracted and focused onto the spectrum acquisition unit through the optical-mechanical platform.

[0024] Further, the optical-mechanical platform includes:

[0025] A slit assembly, which is used to introduce the measured light through the slit therein and project it onto the collimating mirror;

[0026] A collimating mirror, which is used to collimate and reflect the measured light onto the grating;

[0027] A grating, which is used to diffract the measured light onto the imaging mirror;

[0028] The focusing lens is used to focus the measured light after diffraction onto the spectral acquisition unit.

[0029] Compared with the prior art, the beneficial effects of the present invention include: when the irradiation lateral dimension of the measured light is smaller than the photosensitive area of the spectral acquisition unit, the dumb pixel part in the spectral acquisition unit does not collect the spectral data of the measured light, and its pixel data is used as dumb pixel data to deduct the circuit background noise, improving the accuracy of the spectral data of the spectral acquisition unit. The target part uses the collected spectral data for analysis and processing;

[0030] When the irradiation lateral dimension of the measured light is equal to the photosensitive area of the spectral acquisition unit, all pixels on the photosensitive surface of the spectral acquisition unit collect the spectral information of the measured light, and all pixel data can be used and processed. The spectrometer can operate according to the normal working procedure;

[0031] The data processing module controls the driving of the spectral acquisition unit through the driving circuit. When different spectral acquisition units are replaced, the data processing module controls and adjusts the driving circuit so that the spectral acquisition unit can operate normally. In this way, spectral acquisition units with the same photosensitive lateral dimension can effectively collect spectral information of different focusing sizes, without the need to replace the spectral acquisition unit and the driving circuit according to the spectral irradiation size of the measured light. The present invention can ensure the universality of the spectral acquisition unit and its driving circuit for large, medium, small, and ultra-small spectrometers, thereby improving the universality and acquisition effect of the spectral acquisition unit, and thus facilitating large-scale production and cost savings. Description of the Drawings

[0032] Figure 1 is the flowchart of the method according to Embodiment 1 of the present invention;

[0033] Figure 2 is the connection diagram according to Embodiment 2 of the present invention;

[0034] Figure 3 is the schematic diagram of the non-full pixel use of the linear photodetector according to Embodiment 1 of the present invention;

[0035] Figure 4 is the optical path diagram of the opto-mechanical platform according to Embodiment 2 of the present invention;

[0036] Figure 5 is the xenon lamp spectrum diagram according to Embodiment 2 of the present invention. Detailed Embodiments

[0037] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] Embodiment 1:

[0039] Embodiment 1 of the present invention provides a spectrometer control method, as Figure 1 and 3 shown, including the following steps:

[0040] S1, the spectral acquisition unit acquires the spectral data of the measured light; the part of the spectral acquisition unit 1 irradiated by the measured light is the target part 101, and the part not irradiated is the dummy part 102;

[0041] S2, save and process the spectral data of the target part 101; the data of the dummy part 102 is used as the data for background noise deduction.

[0042] In this embodiment, when the irradiation lateral dimension of the measured light is smaller than the photosensitive area of the spectral acquisition unit 1, the spectral data not acquired by the dummy part 102 in the spectral acquisition unit 1, and the pixel data of the dummy part 102 is used as dummy data for deducting the circuit background noise to improve the accuracy of the spectral data of the spectral acquisition unit 1; the spectral data of the target part 101 is used as the spectral data to be processed;

[0043] When the irradiation lateral dimension of the measured light is equal to the photosensitive surface of the spectral acquisition unit 1, all pixels on the photosensitive surface of the spectral acquisition unit 1 have acquired the spectral information of the measured light, and all pixel data can be used and processed, and the spectrometer can execute the work according to the normal working procedure;

[0044] In this way, spectral acquisition units 1 with different photosensitive lateral surface dimensions can effectively acquire the spectral information of different lights, improving the versatility and acquisition effect of the spectral acquisition unit 1.

[0045] In step S2, the method for processing the spectral data of the target part includes: obtaining the spectral data of the target part 101 in the measured light and calibrating the spectral wavelength of the target part 101. Extract the spectral data detected by the pixels of the target part 101 from the complete pixel data of the spectral acquisition unit 1.

[0046] The method for obtaining the spectral data of the target part 101 includes: the data processing module 3 only outputs the spectral data of the target part 101 according to the setting; or, the analog-to-digital conversion unit only converts the spectral data information of the target part according to the setting.

[0047] Calibrate the spectral wavelength of the target part, and calibrate the spectrum expressed by the pixels of the target part as the spectrum expressed by the wavelength using the stored wavelength calibration parameters.

[0048] Step S further includes: adjusting the amplitude of the output signal voltage of the spectral acquisition unit 1 to match the amplitude of the input signal voltage of the analog-to-digital conversion unit 31. This can enable the current spectral acquisition unit 1 to work properly.

[0049] Before step S1, it further includes the step of collecting background light as a reference spectrum, which can improve the accuracy of spectral data.

[0050] This embodiment further includes step S3: displaying the spectrum of the target part. The spectral data of the target part is expressed in the form of a curve, that is, the curve of spectral intensity varying with wavelength, which is used for spectral analysis.

[0051] In this embodiment, the structure and working principle of the spectral acquisition unit 1 are as follows:

[0052] In the embodiment of the present invention, the spectral acquisition unit 1 is preferably a linear array photodetector. As Figure 3 shown, the spectral light beam irradiates on the photosensitive surface 11 of the linear array photodetector to form a focused spectrum. Points A and B are the upper and lower edge points of the focused spectrum, and points A and B divide the photosensitive surface 11 into a first pixel area 111, a second pixel area 112, and a third pixel area 113; among them, the first pixel area 111 is the pixel area corresponding to the focused spectrum, with n1 pixels; the second pixel area 112 is the lower part pixel area of the photosensitive surface not irradiated by the focused spectrum, with n2 pixels; the third pixel area 113 is the upper part pixel area of the photosensitive surface not irradiated by the focused spectrum, with n3 pixels; the photosensitive surface 11 usually contains N pixels, such as 2048 pixels or 3648 pixels, etc. Thus, the total number of pixels of the photosensitive surface 11 of the linear array photodetector: N = n1 + n2 + n3.

[0053] Among them, the pixels on the second pixel area 112 and the third pixel area 113 form a dummy part 102, which can be used as a dummy to deduct the circuit background noise; the pixels of the first pixel area 111 form a target part 101, and the spectral data thereon is used for subsequent processing and analysis, and finally the required spectrum is formed.

[0054] Embodiment Two:

[0055] The embodiment two of the present invention provides a spectrometer control system, which adopts the spectrometer control method provided in embodiment one. As Figure 2 and 3 shown, it includes:

[0056] A spectral acquisition unit 1, which is used to collect the spectral data of the measured light. The part of the spectral acquisition unit 1 irradiated by the measured light is the target part 101, and the part not irradiated is the dummy part 102; the target part 101 is used to collect the spectral data of the measured light, and the dummy part 102 is used to deduct the background noise;

[0057] A driving circuit 2, which is used to drive and control the spectral acquisition unit 1;

[0058] The data processing module 3 is used to save and process the spectral data of the measured light collected by the spectral acquisition unit 1, and control the driving of the spectral acquisition unit 1 through the driving circuit 2.

[0059] In this embodiment, the spectral acquisition unit 1 is preferably a linear array photodetector. The data processing module 3 controls the driving of the linear array photodetector through the driving circuit 2. When replacing different linear array photodetectors, the data processing module 3 controls and adjusts the driving circuit 2 so that the linear array photodetector can work properly. The linear array photodetector 101 can be a linear array CCD or CMOS, etc., or one or several rows of pixels of a area array photodetector.

[0060] In this embodiment, the data processing module 3 includes:

[0061] The analog-to-digital conversion unit 31 is used to convert the analog information of the spectral acquisition unit 1 into digital information;

[0062] The conditioning circuit 32 is used to adjust the amplitude of the output signal voltage of the spectral acquisition unit 1 to match the amplitude of the input signal voltage of the analog-to-digital conversion unit 31;

[0063] The control unit 33 is used to control the driving circuit 2 of the spectral acquisition unit 1, and receive and process the digital information of the analog-to-digital conversion unit 31. In this embodiment, the control unit 33 is an embedded controller, including microcontrollers such as ARM and FPGA.

[0064] The data processing module 3 further includes a storage unit 34, which is used to store the spectral data, calibration parameters, product information, etc. of the control unit 33.

[0065] The data processing module 3 further includes a clock unit 35. The clock unit 35 transmits system clock information to the control unit 33, the analog-to-digital conversion unit 31 and the spectral acquisition unit 1, so that they can cooperate in work according to the set timing.

[0066] The data processing module 3 further includes a communication unit 36. The spectral data of the control unit 33 is output outward through the communication unit 36. In this embodiment, the communication unit 36 is a communication interface, including USB, RS232, RS485, etc., for information transmission between the spectrometer and the computer.

[0067] This embodiment further includes a display processing unit 4. The display processing unit 4 performs data interaction with the control unit 33 of the data processing module 3. In this embodiment, the display processing unit 4 is a computer or a microcontroller, etc., which can control the spectrometer and process and display the spectrum.

[0068] This embodiment further includes an optical-mechanical platform 5 for importing, diffracting, and focusing the measured light. As shown in FIG. 4, it includes a slit assembly 51, a collimating mirror 52, a grating 53, and a focusing mirror 54 disposed within the housing. The slit assembly 51 is configured to import the measured light through the slit 511 therein and project it onto the collimating mirror 52; the collimating mirror 52 is configured to reflect the measured light onto the grating 53; the grating 53 is configured to diffract the measured light onto the focusing mirror 54;

[0069] The focusing mirror 54 is configured to focus the measured light onto the spectral acquisition unit 1; the pixels of the spectral acquisition unit 1 in the target portion can be a part of the pixels of the spectral acquisition unit 1 or all of the pixels of the spectral acquisition unit 1. For the case of non-all pixels, the pixel data of the other unused linear photodetectors can be used as dummy data for deducting the circuit background noise.

[0070] In this embodiment, the drive circuit 2 and the data processing module 3 are disposed on the PCB circuit board, and the PCB circuit board is disposed inside the sidewall of the fiber optic spectrometer; the fiber optic connector uses but is not limited to SMA905 or FC, etc.;

[0071] Actually, there can be various optical paths for the optical-mechanical platform 5 applicable to the present invention. In addition to Figure 4 the C-T optical path shown, it can also be other optical path forms such as the M optical path.

[0072] The working process of this embodiment is as follows:

[0073] As Figure 1 shown, first, start the interface; import the measured light into the optical-mechanical platform 5, and the optical-mechanical platform 5 diffracts and focuses the measured light.

[0074] Then, the measured light irradiates the photosensitive surface of the linear photodetector through the optical-mechanical platform 5. The portion irradiated by the measured light is the target portion 101, and the portion not irradiated is the dummy portion 102;

[0075] Extract the spectral data detected by the pixels in the target portion from the complete pixel data of the spectral acquisition unit 1. The control unit 33 outputs only the spectral data of the target portion 101 according to the setting of the display processing unit 4, or the analog-to-digital conversion unit 31 converts only the spectral data information of the target portion 101 according to the setting of the display processing unit 4 to obtain the spectral data of the target portion 101 in the measured light. Calibrate the spectral wavelength of the target portion 101, and use the stored wavelength calibration parameters to calibrate the spectrum expressed by the pixels of the target portion 101 into the spectrum expressed by the wavelength.

[0076] Finally, display the spectrum through the display processing unit 4.

[0077] As Figure 5As shown, it is the xenon lamp spectrum diagram of the embodiment of the present invention. The middle part of the pixels of the linear photodetector is used to receive the xenon lamp spectrum, and this spectrum is the continuous spectrum of the xenon lamp from 200nm to 1000nm.

[0078] As mentioned above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A spectrometer control method, characterized in that, For a spectrometer control system, the spectrometer control system includes: A spectral acquisition unit for acquiring spectral data of the measured light. The part of the spectral acquisition unit irradiated by the measured light is the target part, and the part not irradiated is the dummy part. The target part is used to acquire spectral data of the measured light, and the dummy part is used to subtract background noise; A drive circuit for driving and controlling the spectral acquisition unit; A data processing module for saving and processing the spectral data of the measured light acquired by the spectral acquisition unit, and controlling the driving of the spectral acquisition unit through the drive circuit; The spectrometer control method includes the following steps: S1. The spectral acquisition unit acquires spectral data of the measured light. When the lateral dimension of the irradiation of the measured light is equal to the photosensitive surface of the spectral acquisition unit, the spectrometer operates according to the normal working procedure. When the lateral dimension of the irradiation of the measured light is smaller than the photosensitive area of the spectral acquisition unit, the part of the spectral acquisition unit irradiated by the measured light is the target part, and the part not irradiated is the dummy part; When the lateral dimension of the irradiation of the measured light is smaller than the photosensitive area of the spectral acquisition unit, the part of the spectral acquisition unit irradiated by the measured light is the target part, and the part not irradiated is the dummy part; S2. The data processing module, according to the setting, only outputs the spectral data information of the target part, and calibrates the spectrum expressed by the pixels of the target part to the spectrum expressed by the wavelength using the stored wavelength calibration parameters. The data of the dummy part is used as the data for subtracting background noise.

2. The spectrometer control method according to claim 1, wherein The method for acquiring spectral data of the target part includes: The analog-to-digital conversion unit, according to the setting, only converts the spectral data information of the target part.

3. The spectrometer control method according to claim 1 or 2, characterized in that, Step S2 further includes: Adjusting the amplitude of the output signal voltage of the spectral acquisition unit to match the amplitude of the input signal voltage of the analog-to-digital conversion unit.

4. The spectrometer control method according to claim 3, wherein, Before step S1, there is also a step: Acquiring background light as a reference spectrum.

5. The spectrometer control method according to claim 3, wherein There is also step S3: Displaying the spectrum of the target part.

6. The spectrometer control method according to claim 1, characterized in that, The data processing module includes: An analog-to-digital conversion unit for converting the analog information of the spectral acquisition unit into digital information; A conditioning circuit for adjusting the amplitude of the output signal voltage of the spectral acquisition unit to match the amplitude of the input signal voltage of the analog-to-digital conversion unit; A control unit for controlling the drive circuit of the spectral acquisition unit and receiving and processing the digital information of the analog-to-digital conversion unit.

7. The spectrometer control method according to claim 6, wherein The data processing module further includes a storage unit and a clock unit. The storage unit is used to store the spectral data of the control unit, and the clock unit transmits system clock information to the control unit, the analog-to-digital conversion unit, and the spectral acquisition unit.

8. The spectrometer control method according to claim 7, characterized in that, The data processing module further includes a communication unit, and the spectral data of the control unit is output outward through the communication unit.

9. The spectrometer control method according to claim 1, characterized in that The spectrometer control system further includes a display processing unit, and the display processing unit performs data interaction with the data processing module.

10. The spectrometer control method according to any one of claims 6-9, characterized in that, There is also an opto-mechanical platform, and the measured light is diffracted and focused onto the spectral acquisition unit through the opto-mechanical platform.

11. The spectrometer control method according to claim 10, characterized in that, The opto-mechanical platform includes: A slit assembly for guiding the measured light through the slit therein and projecting it onto the collimating mirror; The collimating mirror for collimating and reflecting the measured light onto the grating; The grating for diffracting the measured light onto the focusing mirror; The focusing mirror for focusing the diffracted measured light onto the spectral acquisition unit.

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