CN108267423A - A kind of operating circuit of raster micro mirror near infrared spectrometer - Google Patents
A kind of operating circuit of raster micro mirror near infrared spectrometer Download PDFInfo
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- CN108267423A CN108267423A CN201810050396.9A CN201810050396A CN108267423A CN 108267423 A CN108267423 A CN 108267423A CN 201810050396 A CN201810050396 A CN 201810050396A CN 108267423 A CN108267423 A CN 108267423A
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- 230000003595 spectral effect Effects 0.000 claims abstract description 29
- 238000004891 communication Methods 0.000 claims abstract description 14
- 230000001360 synchronised effect Effects 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000004611 spectroscopical analysis Methods 0.000 claims description 4
- 230000002463 transducing effect Effects 0.000 claims 1
- 238000013461 design Methods 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000002329 infrared spectrum Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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- 239000006185 dispersion Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
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- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 1
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- 238000012797 qualification Methods 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/255—Details, e.g. use of specially adapted sources, lighting or optical systems
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Abstract
The present invention proposes a kind of operating circuit based on raster micro mirror near infrared spectrometer, including electric power management circuit and spectrometer control circuit.Wherein spectrometer control circuit includes the PGA and ADC channel that at least two-way is used for spectroscopic acquisition, all the way for the filtered devices of PGA and ADC channel of angle sensor acquisition, for the filtered devices of DAC and PGA channels of the driving of raster micro mirror, for the usb circuit of host computer communication, external cache and the FPGA as main control chip.In the present invention, PGA receives PGA by the I/O port of FPGA and controls signal, realizes detector input signal gain programmable, improves the flexibility of spectrometer control circuit.By control of the FPGA synchronizing clock signals to ADC in system, the synchronous acquisition of raster micro mirror angle sensor signal and spectral signal is realized, Spectral Reconstruction is precisely accomplished convenient for host computer.
Description
Technical field
The invention belongs to spectrometric instrument technical fields, are related to the work electricity of raster micro mirror near infrared spectrometer
Road.
Background technology
Spectrometric instrument is a kind of important contemporary optics instrument, by realizing the structure to substance with light-dividing principle
With the quantification and qualification of component.Near-infrared spectral analysis technology can efficiently complete the frequency multiplication of the molecule containing hydrogen group with
Sum of fundamental frequencies absorbs infomation detection, is widely used in the fields such as industrial production and substance detection.Near infrared spectrum refers to wavelength in 800nm
Electromagnetic wave in the range of ~ 2500nm, common near infrared spectrometer can be roughly divided into dispersion formula, filter type, Fourier formula, sound
Magic eye formula etc..
At present, with the high speed development in the fields such as environmental monitoring, food safety detection, biological medicine, spectrometer is carried
Go out micromation, low cost, wide spectral range, high-precision requirement, and based on the near infrared spectrum of raster micro mirror design
Instrument can not realize that single tube detector covers full near infrared spectrum often because of the limitation of the corresponding spectral coverage of detector.Therefore, it is low into
Realize that spectrometer is detected in near-infrared all band frequently with double on the basis of this（It is more）The mode of detector completes such scanning light
The design of grid micro mirror spectrometer.This design method reduces the cost of spectrometer, is at the same time the light path design of spectrometer
Challenge is all brought with circuit design in instrument.
Operating circuit based on raster micro mirror near infrared spectrometer is integrated scanning grating micro mirror near infrared spectrometer
One of key components, main function is to based on the raster in raster micro mirror near-infrared micro spectrometer
Micro mirror is driven control, and acquires the spectral signal that detector detects, and is transferred in host computer.At present, common MEMS
Raster micro mirror spectrometer generally coordinates the acquisition of AD acquisitions realization spectral signal all the way using simple detector, and simultaneously
It is controlled using analog closed-loop and realizes the amplitude of micro mirror, phase, FREQUENCY CONTROL in spectrometer, such lower cost solution is in control accuracy
There are limitation, analog device can be a greater impact aspect in complicated working environment；In addition, for spectroscopic acquisition
AD all the way can not achieve with closed loop command signal it is synchronous, in environment vibration etc. interference can float the working condition of micro mirror
It moves, it is very unfavorable for Spectral Reconstruction.
Invention content
The present invention is directed to the problem above of existing integrated scanning grating micro mirror near infrared spectrometer operating circuit, it is proposed that one
The operating circuit of kind raster micro mirror near infrared spectrometer coordinates double by using bis- (more) roads spectroscopic acquisition channel
(more) detector provides the solution of all standing spectrometer of near infrared spectral range, spectral signal and angle sensor signal
Synchronous acquisition and control so that designed spectrometer operating circuit is adapted to complicated use environment, and is spectrum
Reconstruct and rear end exploitation provide reliable hardware supported.
It is of the invention specifically to use following technical scheme：
A kind of operating circuit of raster micro mirror near infrared spectrometer is controlled including power supply managing circuit and spectrometer
Circuit forms.
The power supply managing circuit includes DC-DC, LDO（Low dropout regulator, low pressure difference linearity are steady
Depressor) and reference voltage source.Energy is provided for spectrometer control circuit component, and is spectrometer control circuit chip operation
Reference voltage is provided.
The spectrometer control circuit includes the PGA and ADC channel that at least two-way is used for spectroscopic acquisition, is used for all the way
PGA, wave filter and the ADC channel of angle sensor signal acquisition, all the way for raster micro mirror driving DAC, wave filter and
PGA channels, for realizing the usb circuit of control data communication, external cache and FPGA with host computer；
In the spectrometer control circuit, the input terminal of each PGA of spectroscopic acquisition channel connects a detection respectively
Device, output terminal connect corresponding ADC respectively, through ADC by analog signal after the spectral signal amplification that detector is detected and exported
Digital signal is converted to, ADC inputs a signal into FPGA processing by CH1 and CH2 data/address bus；Angle sensor signal acquisition
The input terminal connection angular transducer of the PGA of channel, output terminal connect corresponding ADC, angular transducer signal are amplified
Digital signal is converted by analog signal by ADC, ADC passes data/address bus by angle again and inputs a signal into FPGA processing；
FPGA by signal cache bus by spectroscopic data information and angular transducer information cache to external cache, and pass through host computer
Communication bus exports spectroscopic data information to usb circuit, and data are uploaded to host computer through usb bus；Host computer
Also driving control signal can be sent out, FPGA is inputted by host computer communication bus by usb circuit through usb bus, through FPGA
The DAC of channel is driven to be converted to analog signal by the scanned grating micro mirror of drive signal bus after processing of circuit, DAC outputs
Analog signal is filtered by wave filter, makes analog micromirror drive signal smooth, and filter output signal amplifies laggard through PGA
Mirror driver in a subtle way, the micro mirror vibration of driving raster.
In the present invention, each detection and angular transducer form stimulus part, the micro mirror reflection of input raster
Spectral signal and raster micro mirror angular transducer angle and displacement signal.
In the present invention, PGA is programmable gain amplifier, and PGA can be controlled signal to input in PGA by FPGA by I/O port
Its amplification factor to signal is controlled, it is achieved thereby that spectral detector amplification factor programmable, improves spectral information acquisition
Flexibility.
In the present invention, FPGA is by I/O port to each road spectroscopic acquisition and all the way in angle sensor signal acquisition link
ADC sends FPGA synchronous acquisition clock signals, synchronous to carry out analog to digital signal conversion, synchronous acquisition is realized, convenient for spectrum
Signal completes Spectral Reconstruction work in host computer.
In the present invention, angular transducer signal enters filtered device filtering before FPGA, has filtered out outer signals interference, has carried
Signal-to-noise ratio is risen, the driving control signal that FPGA is sent out enters filtered device filtering before micro mirror driver, it is ensured that driving letter
The interference of radio-frequency component is not contained in number.
In the present invention, FPGA is believed collected spectral data signal and angle and displacement sensing by signal cache bus
Number input external cache, and inputs a signal into usb circuit by host computer communication bus, is uploaded signal by usb bus
To host computer, signal upload and communication task are completed.
The present invention has the characteristics that following technical scheme：
Can be not only spectrometer control circuit component 1. power supply managing circuit includes DC-DC, LDO, reference voltage source
Energy is provided, and can be that spectrometer control circuit chip operation carries reference voltage, improves spectrometer control circuit work
Accuracy and stability.
Signal is controlled to control PGA 2. FPGA sends PGA by I/O port, can be compiled so as to fulfill spectral detector amplification factor
Cheng Hua improves the flexibility of spectral information acquisition.
Before 3. angular transducer signal enters before FPGA and the driving control signal that FPGA is sent out enters micro mirror driver
Filtered device filtering, filtered out outer signals interference, improves the pure property of signal and spectrometer control circuit system
The smooth degree of operation.
4. FPGA can be connect by signal cache bus, host computer communication bus and usb bus by external cache and USB
Mouth circuit is realized and the upload of the signal of host computer and communication function.
5. host computer can send out vibration frequency and amplitude of the micro mirror driving control signal through FPGA control raster micro mirrors,
Realize control of the host computer to raster micromirror movements parameter
6. FPGA is by the way that I/O port is to two-way or multichannel spectroscopic acquisition ADC and angle sensor signal acquisition ADC is sent out together all the way
Clock control signal is walked, realizes multiple signals synchronous acquisition, completes Spectral Reconstruction work in host computer convenient for spectral signal.
Description of the drawings
Fig. 1 is the functional block diagram of this raster micro mirror near infrared spectrometer operating circuit.
Specific embodiment
Technical scheme of the present invention is described in further details with reference to the accompanying drawings of the specification.
It is the functional block diagram of raster micro mirror near infrared spectrometer operating circuit of the present invention as shown in Figure 1.
The operating circuit of raster micro mirror near infrared spectrometer is by power supply managing circuit and spectrometer control circuit
Composition.
Power supply managing circuit includes DC-DC, LDO, reference voltage source, and only spectrometer control circuit component does not carry
For energy, and reference voltage can be provided for spectrometer control circuit chip operation.
In this example, spectrometer control circuit includes the PGA and ADC channel that two-way is used for spectroscopic acquisition, is used for all the way
PGA, wave filter and the ADC channel of angle sensor signal acquisition, all the way for raster micro mirror driving DAC, wave filter and
PGA channels, usb circuit, external cache, FPGA.
In this example, the detector 1 and detector 2 of two-way spectroscopic acquisition channel are defeated by collected spectral signal respectively
Enter respective PGA to be amplified, amplified spectral signal is after respective ADC is converted to digital signal by analog signal through number
FPGA processing is inputted according to bus.The present invention is designed using double spectral detectors so that integrated scanning grating micro mirror scanning range
Whole near infrared bands can be covered, promote the design integrity of near infrared spectrometer.
Collected raster micro mirror angle and displacement signal are sent into corresponding PGA and are amplified by angular transducer,
Corresponding ADC is inputted after filtered device removal front end circuit noise and external interference, and digital signal is converted to by analog signal, by
Angle sensing data bus input FPGA is further processed.Angular transducer signal wants filtered device to filter before entering FPGA
Wave filters out outer signals interference, promotes signal-to-noise ratio.
FPGA by I/O port to two-way spectroscopic acquisition ADC with angle sensor signal acquisition ADC sends out synchronous all the way when
Clock signal realizes synchronous acquisition, completes Spectral Reconstruction work in host computer convenient for spectral signal.
FPGA is inputted collected spectral data signal and angle and displacement sensing signal by signal cache bus outer
Portion caches, and inputs a signal into usb circuit through communication bus by host computer, is uploaded to signal by usb bus upper
Machine.FPGA completes to communicate by external cache and usb circuit with host computer.
Micro mirror drive signal also can be inputted usb circuit by host computer by host computer communication bus, then by upper
Micro mirror drive signal is inputted FPGA processing by position machine communication bus, and treated, and micro mirror drive signal is total by drive signal
Line inputs DAC and is converted to analog signal by digital signal, and the analog signal of DAC outputs is filtered by wave filter, it is ensured that
The interference of radio-frequency component is not contained in drive signal, makes that analog micromirror drive signal is smooth, and filter output signal amplifies through PGA
Laggard mirror driver in a subtle way, the micro mirror vibration of driving raster.
More than, present invention applicant combines Figure of description and detailed explanation has been done to the embodiment of the present invention with retouching
It states, it should be appreciated by those skilled in the art that Yi Shang embodiment is only the preferred embodiments of the invention, explanation is in detail
In order to which reader is helped to more fully understand spirit rather than limiting the scope of the invention of the invention, on the contrary, any be based on this hair
Any improvement or modification that bright spirit is made should all be fallen within the scope and spirit of the invention.
Claims (4)
1. a kind of operating circuit of raster micro mirror near infrared spectrometer, it is characterised in that：The operating circuit includes system
Electric power management circuit and spectrometer control circuit；
The spectrometer control circuit includes the PGA and ADC channel that at least two-way is used for spectroscopic acquisition, all the way for angle
PGA, wave filter and the ADC channel of transducing signal acquisition, DAC, wave filter and the PGA driven all the way for raster micro mirror lead to
Road, for realizing the usb circuit of control data communication, external cache and FPGA with host computer；
In the spectrometer control circuit, the input terminal of each PGA of spectroscopic acquisition channel connects a detection respectively
Device, output terminal connect corresponding ADC respectively, through ADC by analog signal after the spectral signal amplification that detector is detected and exported
Digital signal is converted to, ADC inputs a signal into FPGA processing by CH1 and CH2 data/address bus；Angle sensor signal acquisition
The input terminal connection angular transducer of the PGA of channel, output terminal connect corresponding ADC, angular transducer signal are amplified
Digital signal is converted by analog signal by ADC, ADC passes data/address bus by angle again and inputs a signal into FPGA processing；
FPGA by signal cache bus by spectroscopic data information and angular transducer information cache to external cache, and pass through host computer
Communication bus exports spectroscopic data information to usb circuit, and data are uploaded to host computer through usb bus；Host computer
Also driving control signal can be sent out, FPGA is inputted by host computer communication bus by usb circuit through usb bus, through FPGA
The DAC of channel is driven to be converted to analog signal by the scanned grating micro mirror of drive signal bus after processing of circuit, by wave filter
Signal is smoothed and the PGA through grating micro mirror driving channel is amplified into micro mirror driver, drives raster
Micro mirror.
2. the operating circuit of raster micro mirror near infrared spectrometer according to claim 1, it is characterised in that：The system
System electric power management circuit includes DC-DC, LDO and reference voltage source, provides energy for spectrometer control circuit, and be spectrometer
Control circuit chip work provides reference level reference.
3. the operating circuit of raster micro mirror near infrared spectrometer according to claim 1, it is characterised in that：It is described
FPGA sends PGA by I/O port and signal is controlled to control PGA, realizes spectral detector amplification factor programmable.
4. the operating circuit of raster micro mirror near infrared spectrometer according to claim 1, it is characterised in that：It is described
To two-way spectroscopic acquisition ADC and all the way, angle sensor signal acquisition ADC sends out ADC configuration signals to the I/O port of FPGA, carries out
Synchronised clock controls, and realizes synchronous acquisition, convenient for Spectral Reconstruction work of the spectral signal in host computer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810050396.9A CN108267423B (en) | 2018-01-18 | 2018-01-18 | A kind of operating circuit of raster micro mirror near infrared spectrometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810050396.9A CN108267423B (en) | 2018-01-18 | 2018-01-18 | A kind of operating circuit of raster micro mirror near infrared spectrometer |
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| CN108267423A true CN108267423A (en) | 2018-07-10 |
| CN108267423B CN108267423B (en) | 2019-01-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281361A (en) * | 2021-05-12 | 2021-08-20 | 中国科学院高能物理研究所 | Quick scanning XAFS system |
| CN114264629A (en) * | 2021-12-22 | 2022-04-01 | 海南聚能科技创新研究院有限公司 | Near-infrared sensing circuit and near-infrared spectrum detector |
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| EP1835304A2 (en) * | 2006-03-15 | 2007-09-19 | Omron Corporation | Radar device and mems mirror device therefor |
| CN102589690A (en) * | 2012-03-23 | 2012-07-18 | 重庆大学 | Operating circuit for micro electronic mechanical system (MEMS) scanning micro-mirror spectrometer |
| CN102679971A (en) * | 2012-05-08 | 2012-09-19 | 北京航空航天大学 | Resonant mode optical gyroscope signal detection device and method based on virtual instrument |
| CN106404713A (en) * | 2016-11-23 | 2017-02-15 | 重庆大学 | Double-detector micro near-infrared spectrometer with whole spectral band of 800-2,500nm |
| CN107450178A (en) * | 2017-09-06 | 2017-12-08 | 北京航天长征飞行器研究所 | A kind of two-dimentional MEMS micromirror driving control system and method |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1835304A2 (en) * | 2006-03-15 | 2007-09-19 | Omron Corporation | Radar device and mems mirror device therefor |
| CN102589690A (en) * | 2012-03-23 | 2012-07-18 | 重庆大学 | Operating circuit for micro electronic mechanical system (MEMS) scanning micro-mirror spectrometer |
| CN102679971A (en) * | 2012-05-08 | 2012-09-19 | 北京航空航天大学 | Resonant mode optical gyroscope signal detection device and method based on virtual instrument |
| CN106404713A (en) * | 2016-11-23 | 2017-02-15 | 重庆大学 | Double-detector micro near-infrared spectrometer with whole spectral band of 800-2,500nm |
| CN107450178A (en) * | 2017-09-06 | 2017-12-08 | 北京航天长征飞行器研究所 | A kind of two-dimentional MEMS micromirror driving control system and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281361A (en) * | 2021-05-12 | 2021-08-20 | 中国科学院高能物理研究所 | Quick scanning XAFS system |
| CN113281361B (en) * | 2021-05-12 | 2022-12-02 | 中国科学院高能物理研究所 | Quick scanning XAFS system |
| CN114264629A (en) * | 2021-12-22 | 2022-04-01 | 海南聚能科技创新研究院有限公司 | Near-infrared sensing circuit and near-infrared spectrum detector |
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