CN113916376A - Spectrometer control method and system - Google Patents
Spectrometer control method and system Download PDFInfo
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- CN113916376A CN113916376A CN202010651436.2A CN202010651436A CN113916376A CN 113916376 A CN113916376 A CN 113916376A CN 202010651436 A CN202010651436 A CN 202010651436A CN 113916376 A CN113916376 A CN 113916376A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000001228 spectrum Methods 0.000 claims abstract description 117
- 230000003595 spectral effect Effects 0.000 claims abstract description 58
- 238000012545 processing Methods 0.000 claims abstract description 49
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 8
- 230000003750 conditioning effect Effects 0.000 claims description 5
- 230000003993 interaction Effects 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 229910052724 xenon Inorganic materials 0.000 description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 206010070834 Sensitisation Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000008313 sensitization Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2803—Investigating the spectrum using photoelectric array detector
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0275—Details making use of sensor-related data, e.g. for identification of sensor parts or optical elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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Abstract
The invention discloses a spectrometer control method and a spectrometer control system, wherein the method comprises the following steps: s1, collecting the spectrum data of the measured light by the spectrum collection unit; the part irradiated by the measured light on the spectrum acquisition unit is a target part, and the part not irradiated is a dummy part; s2, storing and processing the spectral data of the target portion; the data of the dummy portion serves as data for subtracting background noise. The system comprises a spectrum acquisition unit, a driving circuit and a data processing module. According to the invention, the spectrum acquisition units with the same photosensitive transverse size can effectively acquire spectrum information with different focusing sizes, and the spectrum acquisition units and the driving circuit do not need to be replaced according to the spectrum irradiation size of the detected light. Therefore, according to the idea of the invention, the spectrum acquisition unit of the large, medium and small spectrometers and the circuit universality thereof can be ensured, thereby being beneficial to large-scale production and saving cost.
Description
Technical Field
The invention belongs to the technical field of optical analysis equipment, and particularly relates to a spectrometer control method and system.
Background
The existing conventional fiber optic spectrometer focuses and images the spectrum of the measured light on the whole photosensitive surface of the spectrum collection unit for detecting the corresponding spectrum. Thus, for spectrometers with different optical focusing structures, spectral illumination images of different sizes are produced, so it is required to receive the spectral illumination images using spectral collection units of different photosensitive lateral dimensions. Thus, in order to adapt to fiber-optic spectrometers with different optical structures, spectrum collecting units with different photosensitive lateral dimensions and different circuits must be developed and designed. This reduces the versatility of the use of the spectrum acquisition unit and its associated circuitry, and the corresponding development design and manufacturing costs are relatively high.
Disclosure of Invention
In order to solve the problems in the prior art, the present invention provides a spectrometer control method and system, which can improve the versatility and the collection effect of a spectrum collection unit.
In order to achieve the above object, the present invention first provides a spectrometer control method, comprising the following steps:
s1, collecting the spectrum data of the measured light by the spectrum collection unit; the part irradiated by the measured light on the spectrum acquisition unit is a target part, and the part not irradiated is a dummy part;
s2, storing and processing the spectral data of the target portion; the data of the dummy portion serves as data for subtracting background noise.
Further, in step S2, the method of processing the spectral data of the target portion includes: and acquiring spectral data of a target part in the measured light, and calibrating the spectral wavelength of the target part.
Further, the method of acquiring spectral data of a target portion includes: the data processing module outputs only the spectral data information of the target portion according to the setting.
Further, the method of acquiring spectral data of a target portion includes: the analog-to-digital conversion unit converts only spectral data information of the target portion according to the setting.
Further, the amplitude of the output signal voltage of the spectrum acquisition unit is conditioned to be matched with the amplitude of the input signal voltage of the analog-to-digital conversion unit.
Further, the method also includes step S3: the spectrum of the target portion is displayed.
The invention also provides a spectrometer control system, which adopts the spectrometer control method and comprises the following steps:
the spectrum acquisition unit is used for acquiring spectrum data of the measured light, the part irradiated by the measured light on the spectrum acquisition unit is a target part, and the part not irradiated is a dummy part; the target part is used for collecting the spectral data of the measured light, and the dummy part is used for deducting background noise;
the drive circuit is used for driving and controlling the spectrum acquisition unit;
and the data processing module is used for storing and processing the spectral data of the detected light collected by the spectral collection unit and controlling and driving the spectral collection unit through the driving circuit.
Further, the data processing module comprises:
the analog-to-digital conversion unit is used for converting the analog information of the spectrum acquisition unit into digital information;
the conditioning circuit is used for adjusting the amplitude of the output signal voltage of the spectrum acquisition unit to be matched with the amplitude of the input signal voltage of the analog-to-digital conversion unit;
and the control unit is used for controlling the drive circuit of the spectrum acquisition unit and receiving and processing the digital information of the analog-to-digital conversion unit.
Furthermore, the data processing module also comprises a storage unit and a clock unit, wherein the storage unit is used for storing the spectrum 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 spectrum acquisition unit.
Furthermore, the data processing module also comprises a communication unit, and the spectral data of the control unit is output outwards through the communication unit.
Furthermore, the system also comprises a display processing unit, and the display processing unit performs data interaction with the data processing module.
Further, the device also comprises an optical machine platform, and the detected light is diffracted by the optical machine platform and focused on the spectrum acquisition unit.
Further, the optical bench includes:
the slit assembly is used for guiding the measured light into the slit and projecting the light to the collimating mirror;
the collimating mirror is used for collimating and reflecting the measured light to the grating;
a grating for diffracting the measured light to an imaging mirror;
and the focusing mirror is used for focusing the diffracted measured light on the spectrum acquisition unit.
Compared with the prior art, the invention has the beneficial effects that: when the transverse irradiation size of the measured light is smaller than the photosensitive area of the spectrum acquisition unit, the dummy part in the spectrum acquisition unit does not acquire the spectrum data of the measured light, the pixel data of the dummy part is used as dummy data for deducting circuit background noise, the precision of the spectrum data of the spectrum acquisition unit is improved, and the target part is used for analyzing and processing the acquired spectrum data;
when the transverse irradiation size of the measured light is equal to the photosensitive area of the spectrum acquisition unit, all pixels on the photosensitive surface of the spectrum acquisition unit acquire the spectrum information of the measured light, all pixel data can be used and processed, and the spectrometer can execute work according to a normal working procedure;
the data processing module controls and drives the spectrum acquisition unit through the driving circuit. When different spectrum acquisition units are replaced, the data processing module controls the conditioning driving circuit to enable the spectrum acquisition units to work normally. Like this, the spectrum collection unit of same sensitization horizontal dimension can effectual collection different focus sizes's spectral information, need not to shine the size according to the spectrum of measured light and change spectrum collection unit and drive circuit. The invention can ensure the universality of the spectrum acquisition unit and the driving circuit of the large, medium and small and subminiature spectrometers, thereby improving the universality and the acquisition effect of the spectrum acquisition unit, and being beneficial to large-scale production and cost saving.
Drawings
FIG. 1 is a flow chart of a method according to a first embodiment of the present invention;
FIG. 2 is a connection diagram according to a second embodiment of the present invention;
fig. 3 is a schematic view of a non-full pixel usage of a linear array photodetector according to a first embodiment of the present invention;
fig. 4 is a light path diagram of an optical bench according to a second embodiment of the present invention;
FIG. 5 is a xenon lamp spectrum illustration of example two of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
an embodiment of the present invention provides a spectrometer control method, as shown in fig. 1 and 3, including the following steps:
s1, the spectrum collecting unit collects 1 the spectrum data of the measured light; the part irradiated by the measured light on the spectrum acquisition unit 1 is a target part 101, and the part not irradiated is a dummy part 102;
s2, saving and processing the spectral data of the target portion 101; the data of the dummy portion 102 serves as data for subtracting background noise.
In this embodiment, when the transverse size of the illumination of the measured light is smaller than the photosensitive area of the spectrum acquisition unit 1, the dummy portion 102 in the spectrum acquisition unit 1 does not have the acquired spectrum data, and the pixel data of the dummy portion 102 is used as the dummy data for deducting the circuit background noise, so as to improve the precision of the spectrum data of the spectrum acquisition unit 1; the spectral data of the target portion 101 is taken as spectral data to be processed;
when the transverse irradiation size of the measured light is equal to the photosensitive surface of the spectrum acquisition unit 1, the spectrum information of the measured light is acquired by all pixels on the photosensitive surface of the spectrum acquisition unit 1, all pixel data can be used and processed, and the spectrometer can execute work according to a normal working program;
like this, the spectrum collection unit 1 of the horizontal face size of different sensitization all can the effectual spectrum information who gathers different light, promotes spectrum collection unit 1's commonality and collection effect.
In step S2, the method of processing spectral data of a target portion includes: spectral data of the target portion 101 in the measured light is acquired, and the spectral wavelength of the target portion 101 is calibrated. The spectral data detected by the pixels of the target portion 101 are extracted from the full pixel data of the spectrum acquisition unit 1.
The method of acquiring spectral data of a target portion 101 includes: the data processing module 3 outputs only the spectral data of the target portion 101 according to the setting; or, the analog-to-digital conversion unit converts only the spectral data information of the target portion according to the setting.
The spectral wavelength of the target portion is calibrated, and the spectrum expressed by the pixels of the target portion is calibrated to a spectrum expressed by the wavelength using the stored wavelength calibration parameters.
The step S also comprises the following steps: the amplitude of the output signal voltage of the spectrum collection unit 1 is adjusted to match the amplitude of the input signal voltage of the analog-to-digital conversion unit 31. The current spectrum collection unit 1 can work normally.
Before step S1, the method further includes the steps of: the background light is collected and used as a reference spectrum, so that the precision of the spectrum data can be improved.
The present embodiment further includes step S3: the spectrum of the target portion is displayed. The spectral data of the target portion is expressed in the form of a curve, i.e., a curve of the spectral intensity as a function of wavelength, for spectral analysis.
In this embodiment, the structure and the working principle of the spectrum acquisition unit 1 are as follows:
in the embodiment of the present invention, the spectrum acquisition unit 1 is preferably a linear array photodetector. As shown in fig. 3, a spectrum beam is irradiated onto the photosensitive surface 11 of the line photodetector to form a focused spectrum, two points A, B are upper and lower edge points of the focused spectrum, and two points A, B divide the photosensitive surface 11 into a first pixel region 111, a second pixel region 112, and a third pixel region 113; wherein the first pixel region 111 is a pixel region corresponding to the focusing spectrum and has n1A plurality of pixels; the second pixel region 112 is the lower pixel region where the focused spectrum is not irradiated to the photosensitive surface, and has n2A plurality of pixels; the third pixel region 113 is an upper portion of the pixel region where the focused spectrum is not irradiated to the photosensitive surfaceHas n of3A plurality of pixels; the photosensitive surface 11 generally includes N pixels, such as 2048 pixels or 3648 pixels. Thus, the total pixels of the photosensitive surface 11 of the linear array photodetector: n ═ N1+n2+n3。
The pixels in the second pixel area 112 and the third pixel area 113 form a dummy portion 102, which can be used as a dummy for subtracting the circuit background noise; the pixels of the first pixel region 111 constitute the target portion 101, on which the spectral data is used for subsequent processing and analysis, ultimately forming the desired spectrum.
Example two:
an embodiment of the present invention provides a spectrometer control system, which uses the spectrometer control method provided in the embodiment one, as shown in fig. 2 and 3, and includes:
the spectrum acquisition unit 1 is used for acquiring spectrum data of the measured light, the part of the spectrum acquisition unit 1 irradiated by the measured light is a target part 101, and the part of the spectrum acquisition unit 1 not irradiated is a dummy part 102; the target part 101 is used for collecting the spectral data of the measured light, and the dummy part 102 is used for deducting background noise;
the drive circuit 2 is used for driving and controlling the spectrum acquisition unit 1;
and the data processing module 3 is used for storing and processing the spectral data of the detected light acquired by the spectral acquisition unit 1 and controlling and driving the spectral acquisition unit 1 through the driving circuit 2.
In this embodiment, the spectrum acquisition unit 1 is preferably a linear array photodetector, and the data processing module 3 controls and drives the linear array photodetector through the driving circuit 2. When different linear array photoelectric detectors are replaced, the data processing module 3 controls the conditioning driving circuit 2, so that the linear array photoelectric detectors can work normally. The linear array photodetector 101 may employ a linear array CCD or CMOS, or the like, or one or several rows of pixels using an area array photodetector, or the like.
In this embodiment, the data processing module 3 includes:
the analog-to-digital conversion unit 31 is used for converting the analog information of the spectrum acquisition unit 1 into digital information;
the conditioning circuit 32 is configured to adjust an amplitude of the output signal voltage of the spectrum acquisition unit 1 to match the amplitude of the input signal voltage of the analog-to-digital conversion unit 31;
the control unit 33 is used for controlling the drive circuit 2 of the spectrum acquisition unit 1 and receiving and processing the digital information of the analog-to-digital conversion unit 31; in this embodiment, the control unit 33 is an embedded controller, and includes micro controllers such as an ARM and an FPGA.
The data processing module 3 further comprises a storage unit 34 for storing the spectral data, calibration parameters, product information, etc. of the control unit 33.
The data processing module 3 further includes a clock unit 35, and the clock unit 35 transmits system clock information to the control unit 33, the analog-to-digital conversion unit 31, and the spectrum acquisition unit 1, so that they can work and cooperate with each other according to a set time sequence.
The data processing module 3 further includes a communication unit 36, and the spectral data of the control unit 33 is output to the outside through the communication unit 36. In this embodiment, the communication unit 36 is a communication interface, and includes USB, RS232, RS485, and the like, and is used for information transmission between the spectrometer and the computer.
The present embodiment further includes a display processing unit 4, and 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, and can control the spectrometer and process the display spectrum.
The present embodiment further includes an optical bench 5 for guiding, diffracting and focusing the measured light, as shown in fig. 4, including a slit assembly 51, a collimating mirror 52, a grating 53 and a focusing mirror 54 disposed within the housing. A slit assembly 51 for guiding the measured light through a slit 511 therein and projecting the light to a collimator lens 52; a collimator lens 52 for reflecting the measured light to a grating 53; a grating 53 for diffracting the measured light to a focusing mirror 54;
a focusing mirror 54 for focusing the measured light to the spectrum collection unit 1; the pixels of the spectrum collection unit 1 of the target portion may be a part of the pixels of the spectrum collection unit 1, or may be all the pixels of the spectrum collection unit 1. For less than all pixel cases, the pixel data of the otherwise unused linear array photodetectors may be used as dummy data for subtracting circuit background noise.
In the embodiment, the driving circuit 2 and the data processing module 3 are arranged on a PCB (printed circuit board), and the PCB is arranged on the inner side of the side wall of the optical fiber spectrometer; the optical fiber connector adopts SMA905, FC or the like but is not limited;
in fact, the optical path of the optical bench 5 to which the present invention is applied may be various, and may be other optical paths such as an M optical path instead of the C-T optical path shown in fig. 4.
The workflow of this embodiment is as follows:
as shown in fig. 1, first, the interface is started; the measured light is guided into the opto-mechanical platform 5, and the opto-mechanical platform 5 diffracts and focuses the measured light.
Then, the measured light irradiates on the photosensitive surface of the linear array photoelectric detector through the optical bench 5, the part irradiated by the measured light is a target part 101, and the part not irradiated is a dummy part 102;
the spectral data detected by the target partial pixels are extracted from the full pixel data of the spectrum 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 acquire the spectral data of the target portion 101 in the measured light. The spectral wavelengths of the target portion 101 are calibrated, and the spectra represented by the pixels of the target portion 101 are calibrated as a spectrum represented by the wavelengths using the stored wavelength calibration parameters.
Finally, the spectrum is displayed by the display processing unit 4.
FIG. 5 shows a spectrum chart of a xenon lamp according to an embodiment of the present invention. The middle part of the pixels of the linear array photoelectric detector is used for receiving a xenon lamp spectrum which is a continuous spectrum of 200nm to 1000nm of the xenon lamp.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (14)
1. A spectrometer control method, comprising the steps of:
s1, collecting the spectrum data of the measured light by the spectrum collection unit; the part irradiated by the measured light on the spectrum acquisition unit is a target part, and the part not irradiated is a dummy part;
s2, saving and processing the spectral data of the target portion; the dummy portion data serves as data for subtracting background noise.
2. The spectrometer control method according to claim 1, wherein in step S2, the method of processing the spectral data of the target portion comprises: and extracting the spectral data of the target part and calibrating the spectral wavelength of the target part.
3. The spectrometer control method of claim 2, wherein the method of extracting spectral data of the target portion comprises: the data processing module outputs only the spectral data information of the target portion according to the setting.
4. A spectrometer control method as claimed in claim 2, wherein the method of obtaining spectral data of the target portion comprises: the analog-to-digital conversion unit converts only spectral data information of the target portion according to the setting.
5. The spectrometer control method according to any one of claims 1-4, wherein step S2 further comprises: and adjusting the amplitude of the output signal voltage of the spectrum acquisition unit to be matched with the amplitude of the input signal voltage of the analog-to-digital conversion unit.
6. The spectrometer control method according to claim 5, further comprising, before the step S1, the steps of: background light was collected and used as a reference spectrum.
7. The spectrometer control method according to claim 5, further comprising step S3: the spectrum of the target portion is displayed.
8. A spectrometer control system employing the spectrometer control method of any of claims 1-7, comprising:
the spectrum acquisition unit is used for acquiring spectrum data of the measured light, the part of the spectrum acquisition unit, which is irradiated by the measured light, is a target part, and the part, which is not irradiated, is a dummy part; the target part is used for collecting spectral data of the measured light, and the dummy part is used for deducting background noise;
the drive circuit is used for driving and controlling the spectrum acquisition unit;
and the data processing module is used for storing and processing the spectral data of the detected light acquired by the spectral acquisition unit and controlling and driving the spectral acquisition unit through the driving circuit.
9. The spectrometer control system of claim 8, wherein the data processing module comprises:
the analog-to-digital conversion unit is used for converting the analog information of the spectrum acquisition unit into digital information;
the conditioning circuit is used for adjusting the amplitude of the output signal voltage of the spectrum acquisition unit to be matched with the amplitude of the input signal voltage of the analog-to-digital conversion unit;
and the control unit is used for controlling the drive circuit of the spectrum acquisition unit and receiving and processing the digital information of the analog-to-digital conversion unit.
10. A spectrometer control system as in claim 9, wherein the data processing module further comprises a storage unit for storing the spectral data of the control unit and a clock unit for transmitting system clock information to the control unit, the analog-to-digital conversion unit and the spectral acquisition unit.
11. The spectrometer control system of claim 10, wherein the data processing module further comprises a communication unit, and the spectral data of the control unit is output to the outside through the communication unit.
12. The spectrometer control system of claim 8, further comprising a display processing unit that performs data interaction with the data processing module.
13. A spectrometer control system as claimed in any of claims 8 to 12, further comprising an optical bench through which the measured light is diffracted and focused onto the spectrum collection unit.
14. The spectrometer control system of claim 13, wherein the opto-mechanical stage comprises:
the slit assembly is used for guiding the measured light into the slit and projecting the light to the collimating mirror;
the collimating mirror is used for collimating and reflecting the measured light to the grating;
the grating is used for diffracting the measured light to the imaging mirror;
the focusing mirror is used for focusing the diffracted measured light on the spectrum acquisition unit.
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