CN105403309A - Two-color detector signal amplification control system and method - Google Patents
Two-color detector signal amplification control system and method Download PDFInfo
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- CN105403309A CN105403309A CN201510742694.0A CN201510742694A CN105403309A CN 105403309 A CN105403309 A CN 105403309A CN 201510742694 A CN201510742694 A CN 201510742694A CN 105403309 A CN105403309 A CN 105403309A
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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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/02—Manually-operated control
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Abstract
The invention discloses a two-color detector signal amplification control system comprising a two-color detector working band selection switch, a pre-amplification circuit, a filter circuit, multistage amplification circuits, an A/D conversion circuit, a microprocessor and an upper computer which are connected in series in turn. Each amplification circuit of the multistage amplification circuits is connected with a zero setting offset signal via a D/A conversion circuit and used for providing a zero setting analog signal for the multistage amplification circuits. The beneficial effects of the two-color detector signal amplification control system and method are that the gear is adjusted timely and a control signal is updated when the two-color detector working band selection switch is switched so as to be suitable for two working bands. Noise is effectively suppressed when the amplitude of a weak signal is increased according to the detected noise voltage values of different bands and different gears so that the signal-to-noise ratio and sensitivity of instruments can be enhanced.
Description
Technical field
The present invention relates to double-color detector technical field, particularly relate to a kind of double-color detector signal amplification control system and method.
Background technology
In near-infrared spectrometers, for enabling the service band of instrument cover 600nm ~ 1700nm, usually adopt Si-InGaAs bi-coloured light electric explorer.Double-color detector adopts two kinds of different combinations of detectors, and structure, double-color detector adopts up-down structure, and topside sounder response short wavelength, lower floor's explorer response is through the long wavelength of topside sounder.Use Si-InGaAs double-color detector, the segmentation of whole test wave band is also received with the optical detection device of respective response wave band respectively, can ensure there is higher spectral responsivity within the scope of whole measure spectrum.Detector receives output current signal after light signal, and be voltage signal through enlarge leadingly circuit conversion, then carry out voltage amplification through amplifying circuit, eventually passing A/D circuit conversion is digital signal.Si-PIN and InGaAs-PIN due to detector has different spectral response curves and strong and weak different dark current, therefore need for two kinds of different-wavebands to control the signal processing circuit of detector rear end, and this signal amplification control system also needs to have, and speed is high, noise is low, resolution high.The signal amplification control system direct relation of bi-coloured light electric explorer the index parameter such as signal to noise ratio (S/N ratio), dynamic range, minimum detectable power of spectroanalysis instrument.
Patent of invention " a kind of InGaAs short-wave infrared detector signal disposal system " (application number: 201510119537.4) disclose a kind of signal processing system be made up of parts such as InGaAs short-wave infrared detector, the single-ended change-over circuit of difference, signal condition filtering circuit, analog to digital conversion circuit, data processing circuits.The light signal detected is converted to differential electric signal and delivers to signal input part by InGaAs short-wave infrared detector, and signal input part comprises the first source side resistance R1 and the second source side resistance R2.This system realizes the impedance matching of signal, amplification, main backup interface support by the single-ended change-over circuit of difference, signal obtains the analog difference signal in analog to digital conversion circuit input dynamic range again through the process of signal condition filtering circuit, enter analog to digital conversion circuit and export parallel digital signal, finally import in data processing circuit and realize digital filtering and then carry out parallel-serial conversion, obtain corresponding serial data, and these data are packaged into required data layout.
Patent of invention " a kind of control circuit of photoelectric sensor system gain stabilization " (application number: 201410559435.X) discloses a kind of control circuit of the photoelectric sensor system gain stabilization be made up of amplifying circuit, pulsewidth shaping circuit, voltage discriminator circuit and control voltage dynamic adjustments circuit.Amplifying circuit amplifies the current pulse signal that photodetector anode exports and converts thereof into voltage signal, pulsewidth shaping circuit is removed useless pulse signal and spike signal is converted to the square wave frequency signal of fixed pulse width, voltage discriminator circuit exports the gain of pulse by Upper threshold comparative voltage and Lower Threshold comparative voltage monitoring amplifier circuit, control voltage dynamic adjustments circuit is by the discharge and recharge regulable control voltage of integrating capacitor and adjust the operating voltage of photodetector, and gain stabilization when realizing photodetector work controls.
Si-InGaAs double-color detector has Si-PIN and InGaAs-PIN two optical detection devices, and these two detecting elements are operated in different-waveband respectively, and the spectral response curve on each wave band is also different.In addition, the ground unrest that the dark current of the parasitic light of optical system and detector self causes is after repeatedly amplifying, and can cause signals collecting and have a strong impact on, especially when Feebleness Light Signal Examining, signal can flood by ground unrest.
Disclosed in above-mentioned two kinds of patents, technology does not all consider the problem that the spectral responsivity of two wave bands is different, adopts the signal of single amplification control circuit to two wave bands to amplify, and more cannot switch fast between two of a double-color detector service band.Meanwhile, multistage zeroing offset voltage during different gear under two kinds of wave bands cannot be met, cannot effectively eliminate detector dark current noise effect.
Summary of the invention
Object of the present invention is exactly to solve the problem, propose a kind of double-color detector signal amplification control system and method, this system and method can adapt to the selection signal of two kinds of wave bands, enlargement factor combination and the control of filtering bandwidth, and provides multiple gear to select and video bandwidth sets.This signal amplification control system has level Four zeroing shifted signal compensating circuit simultaneously, amp.in is incorporated into by D/A, effective restraint speckle increases the amplitude of feeble signal, improves the index parameter such as signal to noise ratio (S/N ratio), dynamic range, minimum detectable power of instrument.
To achieve these goals, the present invention adopts following technical scheme:
A kind of double-color detector signal amplification control system, comprising: the double-color detector service band selector switch, pre-amplification circuit, filtering circuit, multistage amplifier circuit, A/D change-over circuit, microprocessor and the host computer that are sequentially connected in series;
Every one-level amplifying circuit of described multistage amplifier circuit all connects zeroing shifted signal, for providing zeroing simulating signal for multistage amplifier circuit by D/A change-over circuit;
Described microprocessor realizes the selection of the selection of double-color detector service band, the enlargement factor of pre-amplification circuit and the selection of anti-aliasing analogue filter circuit filtering bandwidth by controlling enlarge leadingly control signal latch; Described microprocessor selects to export the signal after amplifying by controlling to amplify output signal latch.
Every one-level amplifying circuit of described multistage amplifier circuit is all connected with video bandwidth control circuit, for controlling the simulating signal bandwidth of multistage amplifier circuit.
The size of described zeroing shifted signal is determined according to the size of every one-level amplifying circuit output noise magnitude of voltage.
The gear of described video bandwidth comprises VBW1 ~ VBW6.
Described microprocessor selects the amplification gear of multistage amplifier circuit and the video bandwidth of bandwidth control circuit thereof by controlling multistage amplification control signal latch.
Described multistage amplifier circuit is level Four amplifying circuit.
Described pre-amplification circuit is that electric current turns voltage amplifier circuit, and the enlargement factor of described pre-amplification circuit selects gear to comprise: 1k Ω, 10k Ω, 100k Ω, 1M Ω, 10M Ω and 100M Ω; Selected gear is latched by enlarge leadingly control signal and sends in pre-amplification circuit.
Described multilevel signal amplifying circuit is voltage amplifier circuit, and the enlargement factor of described multilevel signal amplifying circuit selects gear to comprise: × 1 times, × 10 times, × 100 times, × 1000 times, × 10000 times; Selected gear is latched by multistage amplification control signal and sends in multistage level amplifying circuit.
A method for double-color detector signal amplification control system, comprising:
The current signal that double-color detector exports is voltage signal through enlarge leadingly circuit conversion, after anti-aliasing analogue filter circuit filter away high frequency noise, then amplifies through multistage amplifier circuit, eventually passes A/D change-over circuit and upload in host computer;
Microprocessor carries out addressing access to each control port, and control port comprises: enlarge leadingly control signal latches port, multistage zeroing shifted signal port, amplifies control signal latch port, amplifies to output signal and latch port;
Microprocessor is the fixing address of each port assignment one, carries out read-write operation, by data bus, control signal is sent into pre-amplification circuit, filtering circuit and multistage amplifier circuit respectively to corresponding address; After the simulating signal conversion digital signal after amplification, be sent to the data bus of host computer; Host computer calculates zeroing offset voltage value according to noise voltage size, by digital analog converter, zeroing offset voltage digital signal is converted to simulating signal and feeds back to multistage amplifier circuit.
When input optical power is zero, microprocessor detects the output noise magnitude of voltage of every one-level amplifying circuit when two kinds of service bands and different gear in multistage amplifier circuit respectively, calculates the zeroing shifted signal of every one-level amplifying circuit according to described magnitude of voltage;
Described zeroing shifted signal provides direct current signal offset voltage for every one-level amplifying circuit, when output voltage multistage amplifier circuit again being detected is zero, show the ground unrest eliminated due to the parasitic light of optical system and the dark current noise of detector self.
The invention has the beneficial effects as follows:
(1) 16 high speed microprocessors of the present invention amplify control signal latch port, 12 zeroing shifted signal V by addressing mode to 16 locative prepositions
aport, 12 zeroing shifted signal V
bport, 12 zeroing shifted signal V
cport, 12 zeroing shifted signal V
dport, 16 amplification control signal latch ports, 16 amplification board output signal selection switch control rule ports carry out read-write operation, and host computer enters row selection signal by data bus to circuit, enlargement factor combines and the control of filtering bandwidth.
(2) gear control signal of the present invention is for controlling pre-amplification circuit, anti-aliasing analogue filter circuit and multistage amplifier circuit, and system has 6 × 5 × 6=180 kind optional gear combination selection scheme.The present invention, when the service band selector switch of switch dual chromakey detector, adjusts gear in time and upgrades control signal, to adapt to two kinds of service bands.
(3) signal amplification control system of the present invention has level Four zeroing shifted signal compensating circuit, noise voltage value during gear different from the different-waveband detected, different zeroing offset voltage value is set, amp.in is incorporated into by D/A, operational amplifier for level Four amplifying circuit provides level Four direct current signal offset voltage, restraint speckle effectively while the amplitude increasing feeble signal, improve instrument signal to noise ratio and sensitivity, spectral analysis during faint optical signal input can be met.
Accompanying drawing explanation
Fig. 1 is double-color detector signal amplification control system structural representation of the present invention;
Fig. 2 is gear of the present invention combination system of selection schematic diagram.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
A kind of double-color detector signal amplification control system, comprising: the double-color detector service band selector switch, pre-amplification circuit, filtering circuit, multistage amplifier circuit, A/D change-over circuit, microprocessor and the host computer that are sequentially connected in series;
Every one-level amplifying circuit of multistage amplifier circuit all connects zeroing shifted signal, for providing zeroing simulating signal for multistage amplifier circuit by D/A change-over circuit; The size of zeroing shifted signal is determined according to the size of every one-level amplifying circuit output noise magnitude of voltage;
Microprocessor realizes the selection of the selection of double-color detector service band, the enlargement factor of pre-amplification circuit and the selection of anti-aliasing analogue filter circuit filtering bandwidth by controlling enlarge leadingly control signal latch; Microprocessor selects to export the signal after amplifying by controlling to amplify output signal latch; Microprocessor selects the amplification gear of multistage amplifier circuit and the video bandwidth of bandwidth control circuit thereof by controlling multistage amplification control signal latch.
A method for double-color detector signal amplification control system, comprising:
The current signal that double-color detector exports is voltage signal through enlarge leadingly circuit conversion, after anti-aliasing analogue filter circuit filter away high frequency noise, then amplifies through multistage amplifier circuit, eventually passes A/D change-over circuit and upload in host computer;
Microprocessor carries out addressing access to each control port, and control port comprises: enlarge leadingly control signal latches port, multistage zeroing shifted signal port, amplifies control signal latch port, amplifies to output signal and latch port;
Microprocessor is the fixing address of each port assignment one, carries out read-write operation, by data bus, control signal is sent into pre-amplification circuit, filtering circuit and multistage amplifier circuit respectively to corresponding address; After the simulating signal conversion digital signal after amplification, be sent to the data bus of host computer; Host computer calculates zeroing offset voltage value according to noise voltage size, by DAC, zeroing offset voltage digital signal is converted to simulating signal and feeds back to multistage amplifier circuit.
When input optical power is zero, microprocessor detects the output noise magnitude of voltage of every one-level amplifying circuit when two kinds of service bands and different gear in multistage amplifier circuit respectively, calculates the zeroing shifted signal of every one-level amplifying circuit according to described magnitude of voltage;
Zeroing shifted signal provides direct current signal offset voltage for every one-level amplifying circuit, when output voltage multistage amplifier circuit again being detected is zero, show the ground unrest eliminated due to the parasitic light of optical system and the dark current noise of detector self.
The present embodiment is described for level Four amplifying circuit, as shown in Figure 1, adopt 16 high speed microprocessors for controlling the duty of Acquisition Circuit and the exchanges data with host computer, the current signal that Si-InGaAs double-color detector exports is voltage signal through enlarge leadingly circuit conversion, after anti-aliasing analogue filter circuit filter away high frequency noise, amplify through multistage amplifier circuit again, eventually pass A/D plate and carry out analog to digital conversion and upload in host computer.
Wherein, enlarge leadingly control signal latches for controlling service band selector switch, the enlargement factor selector switch of pre-amplification circuit and the filtering bandwidth selector switch of anti-aliasing analogue filter circuit; Level Four zeroing shifted signal for level Four amplifying circuit provides zeroing simulating signal, eliminates with this noise caused by the dark current of the parasitic light of optical system and detector self by D/A; Amplification control signal latches the video bandwidth for the amplification Gear Select Switch and bandwidth control circuit thereof controlling level Four amplifying circuit; Amplify output signal to latch for selecting to export the signal after amplifying.
16 high speed microprocessors carry out addressing access to each control port, comprise 16 locative prepositions and amplify control signal latch port, 12 zeroing shifted signal V
aport, 12 zeroing shifted signal V
bport, 12 zeroing shifted signal V
cport, 12 zeroing shifted signal V
dport, 16 amplification control signals latch port, 16 amplification board output signal selection switch control rule ports.
Microprocessor is the fixing address of each port assignment one, carries out read-write operation to corresponding address, by data bus, 16 control signals is sent into pre-amplification circuit, anti-aliasing analogue filter circuit and multistage amplifier circuits; By ADC, the simulating signal after amplification is converted to 16 position digital signals, and is sent to the data bus of host computer; Through host computer process, 12 zeroing offset voltage digital signals are converted to simulating signal through DAC and feed back to multistage amplifier circuit.
Pre-amplification circuit is that electric current turns voltage amplification, 1k Ω, 10k Ω that its optional gear has, 100k Ω, 1M Ω, 10M Ω, 100M Ω totally 6 grades, is latched send in pre-amplification circuit by enlarge leadingly control signal.Amplifying circuit is voltage amplification, optional gear has × 1 times, × 10 times, × 100 times, × 1000 times, × 10000 times totally 5 grades, being latched by amplification control signal sends in level Four amplifying circuit, wherein × 1 times refers to that signal does not only participate in voltage amplification through voltage follower and directly exports, the output signal enlargement factor of the corresponding level Four amplifying circuit of all the other 4 grades of difference.
Signal amplification control system is provided with 6 video bandwidths (VBW1 ~ 6), and video bandwidth control circuit is for controlling the simulating signal bandwidth of multistage amplifier circuit.So the gear of control signal selects combination to have 6 × 5 × 6=180 kind possibility, as shown in Figure 2, for gear combination system of selection schematic diagram, the sensing of its pointer is selected gear, inside and outside three rotating disks are preamplification board gear, amplification board gear and video bandwidth gear respectively, rotating disk rotates clockwise gear and diminishes, and rotates counterclockwise gear and becomes large.First system selects the gear combination given tacit consent to be sent to control circuit, then the output signal after monitoring amplification, according to size adjustment gear (i.e. dial rotation one lattice) of output signal, and constantly update control signal, finally until the output voltage size to fit detected.When the service band selector switch of switch dual chromakey detector, system will get back to the gear combination of acquiescence immediately, recalculate and find the control signal adapting to new service band.
When slit is closed, the parasitic light of optical system and the dark current of detector can produce obvious noise after amplifying, and need to return to zero in advance.When closedown slit and input optical power are zero, system detects the output noise magnitude of voltage f of level Four amplifying circuit when two kinds of service bands and different gear respectively
a, f
b, f
c, f
d, calculate zeroing shifted signal V according to formula (1), (2), (3), (4)
a, V
b, V
c, V
d, wherein V
reffor the reference voltage level of DAC.
Zeroing shifted signal V
a, V
b, V
c, V
drelevant to optical system, double-color detector, amplification treatment circuit etc., every platform instrument has specific one group of zeroing shifted signal, is determined by its output noise magnitude of voltage when two kinds of service bands and different gear.By V
a, V
b, V
c, V
dbe converted to scale-of-two, wherein most significant digit is sign bit, and be written to DAC according to 12 position digital signals, convert simulating signal to, operational amplifier for level Four amplifying circuit provides level Four direct current signal offset voltage, when output voltage amplifying circuit again being detected is zero, show the ground unrest eliminated due to the parasitic light of optical system and the dark current noise of detector self.After being provided with, namely system can pass through self-inspection, thus the signal that can complete double-color detector normally amplifies.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. a double-color detector signal amplification control system, it is characterized in that, comprising: the double-color detector service band selector switch, pre-amplification circuit, filtering circuit, multistage amplifier circuit, A/D change-over circuit, microprocessor and the host computer that are sequentially connected in series;
Every one-level amplifying circuit of described multistage amplifier circuit all connects zeroing shifted signal, for providing zeroing simulating signal for multistage amplifier circuit by D/A change-over circuit;
Described microprocessor realizes the selection of the selection of double-color detector service band, the enlargement factor of pre-amplification circuit and the selection of anti-aliasing analogue filter circuit filtering bandwidth by controlling enlarge leadingly control signal latch; Described microprocessor selects to export the signal after amplifying by controlling to amplify output signal latch.
2. a kind of double-color detector signal amplification control system as claimed in claim 1, is characterized in that, every one-level amplifying circuit of described multistage amplifier circuit is all connected with video bandwidth control circuit, for controlling the simulating signal bandwidth of multistage amplifier circuit.
3. a kind of double-color detector signal amplification control system as claimed in claim 1, is characterized in that, the size of described zeroing shifted signal is determined according to the size of every one-level amplifying circuit output noise magnitude of voltage.
4. a kind of double-color detector signal amplification control system as claimed in claim 1, it is characterized in that, the gear of described video bandwidth comprises VBW1 ~ VBW6.
5. a kind of double-color detector signal amplification control system as claimed in claim 1, is characterized in that, described microprocessor selects the amplification gear of multistage amplifier circuit and the video bandwidth of bandwidth control circuit thereof by controlling multistage amplification control signal latch.
6. a kind of double-color detector signal amplification control system as claimed in claim 1, it is characterized in that, described multistage amplifier circuit is level Four amplifying circuit.
7. a kind of double-color detector signal amplification control system as claimed in claim 1, it is characterized in that, described pre-amplification circuit is that electric current turns voltage amplifier circuit, and the enlargement factor of described pre-amplification circuit selects gear to comprise: 1k Ω, 10k Ω, 100k Ω, 1M Ω, 10M Ω and 100M Ω; Selected gear is latched by enlarge leadingly control signal and sends in pre-amplification circuit.
8. a kind of double-color detector signal amplification control system as claimed in claim 1, it is characterized in that, described multilevel signal amplifying circuit is voltage amplifier circuit, and the enlargement factor of described multilevel signal amplifying circuit selects gear to comprise: × 1 times, × 10 times, × 100 times, × 1000 times, × 10000 times; Selected gear is latched by multistage amplification control signal and sends in multistage level amplifying circuit.
9. a method for double-color detector signal amplification control system as claimed in claim 1, is characterized in that, comprising:
The current signal that double-color detector exports is voltage signal through enlarge leadingly circuit conversion, after anti-aliasing analogue filter circuit filter away high frequency noise, then amplifies through multistage amplifier circuit, eventually passes A/D change-over circuit and upload in host computer;
Microprocessor carries out addressing access to each control port, and control port comprises: enlarge leadingly control signal latches port, multistage zeroing shifted signal port, amplifies control signal latch port, amplifies to output signal and latch port;
Microprocessor is the fixing address of each port assignment one, carries out read-write operation, by data bus, control signal is sent into pre-amplification circuit, filtering circuit and multistage amplifier circuit respectively to corresponding address; After the simulating signal conversion digital signal after amplification, be sent to the data bus of host computer; Host computer calculates zeroing offset voltage value according to noise voltage size, by digital analog converter, zeroing offset voltage digital signal is converted to simulating signal and feeds back to multistage amplifier circuit.
10. the method for a kind of double-color detector signal amplification control system as claimed in claim 9, it is characterized in that, when input optical power is zero, microprocessor detects the output noise magnitude of voltage of every one-level amplifying circuit when two kinds of service bands and different gear in multistage amplifier circuit respectively, calculates the zeroing shifted signal of every one-level amplifying circuit according to described magnitude of voltage;
Described zeroing shifted signal provides direct current signal offset voltage for every one-level amplifying circuit, when output voltage multistage amplifier circuit again being detected is zero, show the ground unrest eliminated due to the parasitic light of optical system and the dark current noise of detector self.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3718821A (en) * | 1971-10-29 | 1973-02-27 | G Vischulis | Automatically adjusting photoelectric position detector |
| CN2932335Y (en) * | 2006-04-04 | 2007-08-08 | 上海安誉智能科技有限公司 | Double-wavelength infrared flame detector |
| CN101651497A (en) * | 2008-08-13 | 2010-02-17 | 华为技术有限公司 | Gain control method for optical receiver and optical receiving device |
| CN104410378A (en) * | 2014-10-20 | 2015-03-11 | 北京空间机电研究所 | Gain stabilization control circuit for photoelectric detector system |
| CN104748858A (en) * | 2015-03-18 | 2015-07-01 | 北京空间机电研究所 | InGaAs shortwave infrared detector signal processing system |
-
2015
- 2015-11-04 CN CN201510742694.0A patent/CN105403309B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3718821A (en) * | 1971-10-29 | 1973-02-27 | G Vischulis | Automatically adjusting photoelectric position detector |
| CN2932335Y (en) * | 2006-04-04 | 2007-08-08 | 上海安誉智能科技有限公司 | Double-wavelength infrared flame detector |
| CN101651497A (en) * | 2008-08-13 | 2010-02-17 | 华为技术有限公司 | Gain control method for optical receiver and optical receiving device |
| CN104410378A (en) * | 2014-10-20 | 2015-03-11 | 北京空间机电研究所 | Gain stabilization control circuit for photoelectric detector system |
| CN104748858A (en) * | 2015-03-18 | 2015-07-01 | 北京空间机电研究所 | InGaAs shortwave infrared detector signal processing system |
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Address after: 266555 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee after: CLP kesiyi Technology Co.,Ltd. Address before: 266555 No. 98 Xiangjiang Road, Huangdao District, Qingdao City, Shandong Province Patentee before: CHINA ELECTRONIC TECHNOLOGY INSTRUMENTS Co.,Ltd. |
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