CN108534893A - A kind of photoelectric detective circuit for optical heterodyne detection - Google Patents
A kind of photoelectric detective circuit for optical heterodyne detection Download PDFInfo
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- CN108534893A CN108534893A CN201810299280.9A CN201810299280A CN108534893A CN 108534893 A CN108534893 A CN 108534893A CN 201810299280 A CN201810299280 A CN 201810299280A CN 108534893 A CN108534893 A CN 108534893A
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- circuit
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- heterodyne detection
- optical heterodyne
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- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 230000003287 optical effect Effects 0.000 title claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 230000005693 optoelectronics Effects 0.000 claims abstract description 10
- 230000003321 amplification Effects 0.000 claims abstract description 9
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 9
- 230000005622 photoelectricity Effects 0.000 claims description 2
- 238000002955 isolation Methods 0.000 abstract description 5
- 239000000835 fiber Substances 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 5
- 239000013307 optical fiber Substances 0.000 description 5
- 230000005611 electricity Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4228—Photometry, e.g. photographic exposure meter using electric radiation detectors arrangements with two or more detectors, e.g. for sensitivity compensation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/14—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by heterodyning; by beat-frequency comparison
Abstract
The invention discloses a kind of photoelectric detective circuit for optical heterodyne detection, which includes：Opto-electronic conversion diode, across resistance amplifying circuit, single order RC low-pass filter circuits, feedback circuit between in-phase proportion operational amplification circuit and grade.Opto-electronic conversion diode converts optical signals to current signal, and current signal is output to the inverting input across resistance amplifying circuit amplifier, in-phase input end is grounded, single order RC low-pass filter circuits are connect across the output of resistance amplifying circuit, single order RC low-pass filter circuits connect the in-phase input end of in-phase proportion operational amplifier circuit, output terminating resistor of the feedback circuit from in-phase proportion operational amplifier circuit between grade, the input terminal across resistance amplifying circuit is fed back to from the resistance other end again, the reverse input end connecting resistance of in-phase proportion operational amplifier circuit is grounded again.The photoelectric detective circuit may be implemented to the DC isolation of optical heterodyne detection signal with exchange enlarging function, to effectively improve optical heterodyne detection beat signal contrast.
Description
Technical field：
The present invention relates to optical heterodyne detection field of circuit technology, and in particular to a kind of Photoelectric Detection for optical heterodyne detection
Circuit.
Background technology：
With the fast development of optical detector technology, optical detection in ranging, displacement, test the speed etc. to have and widely answer
With.There are mainly two types of optical detector technologies：Light direct detection and optical heterodyne detection.Light direct detection method is simple, it is easy to accomplish, but
It cannot obtain all information of signal, and signal-to-noise ratio is low.Optical heterodyne detection is because with detection sensitivity height, can get signal
All information, noise be relatively high, suitable for signal detection, have a good filtering performance, but optical heterodyne detection method due to
Reference light differs larger with signal light power, causes signal contrast relatively low.In typical acousto-optic frequency shifters frequency displacement measuring device,
It is visited including Distributed Feedback Laser, fibre optic isolater, fiber optic splitter, optical-fiber bundling device, acousto-optic frequency shifters, fibre optic attenuator and photoelectricity
Slowdown monitoring circuit, in order to improve the contrast of signal, generally use reduces the method with reference to luminous power, makes photoelectric detective circuit therein
It is close with signal light power, but this method can lead to the reduction of photodetection circuit sensitivity.
Invention content：
For the deficiency of the photoelectric detective circuit of existing optical heterodyne detection, the present invention provides one kind being used for optical heterodyne detection
Photoelectric detective circuit, can be under conditions of not reducing photodetection circuit sensitivity, by optical heterodyne detection signal
DC isolation differs larger time heterodyne beat signal contrast with amplification, realization reference light power and signal luminous power is exchanged
It improves.
To achieve the goals above, the present invention provides a kind of photoelectric detective circuits for optical heterodyne detection, including light
Electric switching diode D1, across resistance amplifying circuit, single order RC low-pass filter circuits, fed back between in-phase proportion operational amplification circuit and grade
Circuit；The opto-electronic conversion diode D1 converts optical signals to current signal, and current signal is output to across resistance amplification electricity
The inverting input of amplifier A1 in road, in-phase input end ground connection, resistance R1The output end of one termination amplifier A1, another termination amplifier
The reverse input end of A1；The output of amplifier A1 meets the resistance R in single order RC low-pass filter circuits2, resistance R2Connect in-phase proportion amplifier
The in-phase input end of amplifier A2 in circuit, the reverse input end connecting resistance R of amplifier A2 in in-phase proportion operational amplifier circuit4It is grounded again,
Resistance R3The reverse input end of one termination amplifier A2, the other end are grounded, and the output of amplifier A2 terminates to electricity in feedback circuit between grade
Hinder R5, resistance R5The other end feed back to across the reverse input end for hindering amplifier A1 in amplifying circuit.
Further, the opto-electronic conversion diode D1 is PIN photodiode.
Further, described to be realized with the resistance for constituting backfeed loop by operational amplifier A DA4817 across resistance amplifying circuit.
Compared with prior art, beneficial effects of the present invention are：
The DC component of photo-signal and AC compounent are separated by feedback circuit between grade, realize DC communication increasing
The different amplifications of benefit, realize that reference light power and signal luminous power differs the raising of larger time heterodyne beat signal contrast.
Description of the drawings
Fig. 1 is the photoelectric detective circuit schematic diagram that the present invention is used for optical heterodyne detection；
Fig. 2 is a kind of principle sketch of typical acousto-optic frequency shifters frequency displacement measuring device；
Fig. 3 is the heterodyne beat signal that Traditional photovoltaic detection circuit obtains；
Fig. 4 is the heterodyne beat signal that photoelectric detective circuit of the present invention obtains.
In figure, 1-DFB lasers, 2- fibre optic isolaters, the fiber optic splitters of 3-1 × 2,4- acousto-optic frequency shifters, 5- optical fiber declines
Subtract device, the optical-fiber bundling devices of 6-2 × 1,7- photodetection circuits.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, further to this work below in conjunction with attached drawing
It is described in detail on ground, it is clear that described embodiment is only this part of the embodiment, instead of all the embodiments.Based on this
In embodiment, all other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to the range of this protection.
Referring to Fig. 1, a kind of photoelectric detective circuit of optical heterodyne detection includes：Opto-electronic conversion diode, across resistance amplifying circuit,
Single order RC low-pass filter circuits, feedback circuit between in-phase proportion computing circuit and grade.Described opto-electronic conversion diode D1 outputs
It connects across the reverse input end for hindering amplifier A1 in amplifying circuit, is grounded across the in-phase input end for hindering amplifier A1 in amplifying circuit, resistance
R1The output end of one termination amplifier A1, the reverse input end of another termination amplifier A1；The output of amplifier A1 connects single order RC low pass filtereds
Resistance R in wave circuit2, resistance R2It is followed by capacitance C1It is connected to ground again, the positive output end of amplifier A2 in in-phase proportion operational amplifier circuit
It is connected to resistance R2With capacitance C1Tie point, resistance R4The output end of one termination amplifier A2, the other end are grounded through resistance R3, simultaneously
Connect the reverse input end of amplifier A2, resistance R in feedback resistance between grade5The output of amplifier A1 in one termination in-phase proportion operational amplifier circuit
End feedback, it is another to terminate to across the reverse input end for hindering amplifier A1 in amplifying circuit.
Described is realized by operational amplifier A DA4817 with the resistance for constituting backfeed loop across resistance amplifying circuit；
Described single order RC low-pass filter circuits are to be connected to realize by RC circuits, it has larger time constant, cutoff frequency
Rate is very low.
The basic principle of the photoelectric detective circuit of the optical heterodyne detection is：Opto-electronic conversion diode converts optical signals into electricity
Signal is flowed, both contains AC compounent and DC component in current signal at this time.It is directed to Photoelectric Detection, the variation of object to be measured
Amount is only embodied in AC compounent part, and the information of light measurement is free of in DC component.
Opto-electronic conversion diode receives luminous flux in photosurface and generates current signal I0, current signal I at this time0Both it wrapped
I containing direct current signaldAlso include AC signal Ia。
(1) for AC signal IaPart, IaR cannot be flowed through5, all flow through R1, due to R2And C1Series connection forms low pass filtered
Wave device ensure that not losing for AC signal so AC signal is all exported in 1 output end of operational amplifier A.It is put in operation
The output end of big device A1 generates ac voltage signal, realizes the function that exchange is amplified across resistance.
(2) for direct current signal IdPart is divided into two-way Id1And Id2, Id1Flow through R in part5, Id2Flow through R in part1.Analysis stream
Cross R1On electric current Id2, the output voltage of operational amplifier A 2 can be obtained according to the characteristic of operational amplifier：
Then have:
R is flowed through in analysis1On electric current Id2, can shift onto:
DC component can be obtained in the DC component between resistance amplifying circuit and grade on feedback circuit according to reasoning above
Proportionate relationship is：
Note(voltage amplification factor of second level operational amplifier), then
It can be seen that the DC component that photodiode generates under the conditions of photosurface receives luminous flux is by certain ratio
Example flows through R1And R6, specific ratio is
Amplifier A1 selects amplifier ADA4817, A2 to select amplifier AD 8065, and each resistance is respectively in circuit：R1=
10K,R2=100K, R3=1K, R4=5K, R5=100 Ω, C1=10 μ f.It can obtain Id2：Id1=1:600, DC component phase
Than that in low 2 orders of magnitude of AC compounent, can ignore, realize DC isolation, exchange the function of amplification.
Referring to Fig. 2, this is the principle sketch of typical acousto-optic frequency shifters frequency displacement measuring device, and the present invention provides therein
Photoelectric detective circuit 7.In typical acousto-optic frequency shifters frequency displacement measuring device, the laser beam that Distributed Feedback Laser 1 exports connects Fiber isolation
2 input terminal of device, it is 1 that the output of fibre optic isolater 2, which terminates to splitting ratio,：The input terminal of 11 × 2 fiber optic splitter 3, optical fiber point
The output end of beam device 3 separates two-beam, and the light beam separated connects the input terminal of acousto-optic frequency shifters 4,4 output end of acousto-optic frequency shifters
The input terminal of fibre optic attenuator 5 is connect, the second beam light that output end and the fiber optic splitter 3 of fibre optic attenuator 5 separate is connected to 2 × 1
Optical-fiber bundling device 6 carries out difference interference, then carries out signal processing by photodetection circuit 7.
When the optical power ratio of input signal light and reference light is 1:When 600, measured by Traditional photovoltaic detection circuit straight
Galvanic electricity is pressed and the theoretical ratio of alternating voltage is 1:6.1, it is 1 to survey:5.7, the two ratio is coincide.Fig. 3 is shown using traditional light
The optical heterodyne beat signal that power detection circuit obtains, it can be seen that have larger DC component, beat signal contrast in signal
It is relatively low.
The optical heterodyne beat signal that obtained by photoelectric detective circuit 7 of the present invention is as shown in fig. 4, it can be seen that beat signal
Direct current signal is obviously inhibited, and is realized DC isolation and is exchanged amplification effect, and the contrast of beat signal is significantly improved.
Claims (3)
1. a kind of photoelectric detective circuit for optical heterodyne detection, it is characterised in that：It is put including opto-electronic conversion diode D1, across resistance
Big circuit, single order RC low-pass filter circuits, feedback circuit between in-phase proportion operational amplification circuit and grade；Two pole of the opto-electronic conversion
Pipe D1 converts optical signals to current signal, and current signal is output to across the anti-phase input for hindering amplifier A1 in amplifying circuit
End, in-phase input end ground connection, resistance one terminate the output end of amplifier A1, the reverse input end of another termination amplifier A1；Amplifier A1
Output connect the resistance in single order RC low-pass filter circuits, resistance connects the homophase input of amplifier A2 in in-phase proportion operational amplifier circuit
It holds, the reverse input end connecting resistance R of amplifier A2 in in-phase proportion operational amplifier circuit4It is grounded again, resistance R3One termination amplifier A2's is reversed
Input terminal, the other end are grounded, and the output of amplifier A2 terminates to resistance R in feedback circuit between grade5, resistance R5The other end feed back to
Across the reverse input end for hindering amplifier A1 in amplifying circuit.
2. a kind of photoelectric detective circuit for optical heterodyne detection according to claim 1, it is characterised in that：The photoelectricity
Switching diode D1 is PIN photodiode.
3. a kind of photoelectric detective circuit for optical heterodyne detection according to claim 1 or 2, it is characterised in that：It is described
It is realized with the resistance for constituting backfeed loop by operational amplifier A DA4817 across resistance amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810299280.9A CN108534893B (en) | 2018-04-04 | 2018-04-04 | Photoelectric detection circuit for optical heterodyne detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810299280.9A CN108534893B (en) | 2018-04-04 | 2018-04-04 | Photoelectric detection circuit for optical heterodyne detection |
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| Publication Number | Publication Date |
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| CN108534893A true CN108534893A (en) | 2018-09-14 |
| CN108534893B CN108534893B (en) | 2023-12-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061779A (en) * | 2019-04-28 | 2019-07-26 | 重庆三峡学院 | A kind of optical fiber telecommunications system |
| CN112304429A (en) * | 2020-10-23 | 2021-02-02 | 苏州坤元微电子有限公司 | Photoelectric detection circuit |
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| JP2002335133A (en) * | 2001-05-09 | 2002-11-22 | Fujitsu Ltd | Preamplifier and light-receiving device |
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| JP2002335133A (en) * | 2001-05-09 | 2002-11-22 | Fujitsu Ltd | Preamplifier and light-receiving device |
| CN102833006A (en) * | 2012-09-10 | 2012-12-19 | 电子科技大学 | Optical receiver |
| CN105158586A (en) * | 2015-09-11 | 2015-12-16 | 兰州空间技术物理研究所 | Active space electric field detection sensor built-in circuit |
| CN106768321A (en) * | 2015-11-23 | 2017-05-31 | 史树元 | A kind of Optic-Electric Detecting Circuit for weak signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110061779A (en) * | 2019-04-28 | 2019-07-26 | 重庆三峡学院 | A kind of optical fiber telecommunications system |
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| CN112304429A (en) * | 2020-10-23 | 2021-02-02 | 苏州坤元微电子有限公司 | Photoelectric detection circuit |
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| Publication number | Publication date |
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| CN108534893B (en) | 2023-12-15 |
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