CN207964084U - A kind of high RST contrast photoelectric detective circuit for optical heterodyne detection - Google Patents
A kind of high RST contrast photoelectric detective circuit for optical heterodyne detection Download PDFInfo
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- CN207964084U CN207964084U CN201820474599.6U CN201820474599U CN207964084U CN 207964084 U CN207964084 U CN 207964084U CN 201820474599 U CN201820474599 U CN 201820474599U CN 207964084 U CN207964084 U CN 207964084U
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Abstract
The utility model discloses a kind of high RST contrast 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 utility model is related to optical heterodyne detection field of circuit technology, and in particular to a kind of high letter for optical heterodyne detection
Number contrast photoelectric detective 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.
Utility model content：
For the deficiency of the photoelectric detective circuit of existing optical heterodyne detection, the utility model provides a kind of for optical heterodyne
The high RST contrast photoelectric detective circuit of detection, can be under conditions of not reducing photodetection circuit sensitivity, by right
The DC isolation of optical heterodyne detection signal with exchange amplification, realize reference light power and signal luminous power difference it is larger when optical heterodyne
The raising of beat signal contrast.
To achieve the goals above, the utility model provides a kind of high RST contrast photoelectricity for optical heterodyne detection
Detection circuit, including opto-electronic conversion diode D1, across resistance amplifying circuit, single order RC low-pass filter circuits, in-phase proportion operation puts
Big feedback circuit between circuit and grade；The opto-electronic conversion diode D1 converts optical signals to current signal, and by current signal
It is output to across the inverting input for hindering amplifier A1 in amplifying circuit, in-phase input end ground connection, resistance R1One termination amplifier A1's is defeated
Outlet, the reverse input end of another termination amplifier A1；The output of amplifier A1 meets the resistance R in single order RC low-pass filter circuits2, electricity
Hinder R2Connect the in-phase input end of amplifier A2 in in-phase proportion operational amplifier circuit, the reversed input of amplifier A2 in in-phase proportion operational amplifier circuit
Terminating resistor R4It is grounded again, resistance R3The reverse input end of one termination amplifier A2, the other end are grounded, amplifier in feedback circuit between grade
The output of A2 terminates to resistance 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, the beneficial effects of the utility model 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 high RST contrast photoelectric detective circuit schematic diagram that the utility model 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 the utility model photoelectric detective circuit 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 implementation mode
In order to keep the purpose of this utility model, technical solution and advantage clearer, below in conjunction with attached drawing to this make into
It is described in detail to one step, it is clear that described embodiment is only this part of the embodiment, instead of all the embodiments.Base
Embodiment in sheet, all other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, the range of this protection is belonged to.
Referring to Fig. 1, a kind of high RST contrast photoelectric detective circuit for optical heterodyne detection includes：Two pole of opto-electronic conversion
It manages, across resistance amplifying circuit, single order RC low-pass filter circuits, feedback circuit between in-phase proportion computing circuit and grade.Described photoelectricity
Switching diode D1 outputs connect across the reverse input end for hindering amplifier A1 in amplifying circuit, across the same phase for hindering amplifier A1 in amplifying circuit
Input end grounding, resistance R1The output end of one termination amplifier A1, the reverse input end of another termination amplifier A1；The output of amplifier A1
Meet the resistance R in single order RC low-pass filter circuits2, resistance R2It is followed by capacitance C1With being connected to again, amplifier in in-phase proportion operational amplifier circuit
The positive output of A2 terminates to resistance R2With capacitance C1Tie point, resistance R4The output end of one termination amplifier A2, the other end is through electricity
R3 ground connection is hindered, while connecing the reverse input end of amplifier A2, resistance R in feedback resistance between grade5One termination in-phase proportion operational amplifier circuit
The output end of middle amplifier A1 is fed back, 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 utility model provides it
In photoelectric detective circuit 7.In typical acousto-optic frequency shifters frequency displacement measuring device, the laser beam that Distributed Feedback Laser 1 exports connects light
2 input terminal of fiber isolator, 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,
The output end of fiber optic splitter 3 separates two-beam, and the light beam separated connects the input terminal of acousto-optic frequency shifters 4, acousto-optic frequency shifters 4
The input terminal of output termination fibre optic attenuator 5, the second beam light that the output end of fibre optic attenuator 5 is separated with fiber optic splitter 3 connect
To 2 × 1 optical-fiber bundling devices 6, difference interference is carried out, then signal processing is carried out 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 obtained by the utility model photoelectric detective circuit 7 is as shown in fig. 4, it can be seen that beat frequency is believed
Number direct current signal obviously inhibited, realize DC isolation and exchange amplification effect, significantly improve the comparison of beat signal
Degree.
Claims (3)
1. a kind of high RST contrast photoelectric detective circuit for optical heterodyne detection, it is characterised in that：Including opto-electronic conversion two
Pole pipe D1, across resistance amplifying circuit, single order RC low-pass filter circuits, feedback circuit between in-phase proportion operational amplification circuit and grade；Institute
It states opto-electronic conversion diode D1 and converts optical signals to current signal, and current signal is output to across hindering amplifier in amplifying circuit
The inverting input of A1, in-phase input end ground connection, resistance one terminate the output end of amplifier A1, and another termination amplifier A1's is reversed defeated
Enter end；The output of amplifier A1 connects the resistance in single order RC low-pass filter circuits, and resistance meets amplifier A2 in in-phase proportion operational amplifier circuit
In-phase input end, the reverse input end connecting resistance R of amplifier A2 in in-phase proportion operational amplifier circuit4It is grounded again, resistance R3One termination fortune
The reverse input end of A2 is put, the other end is grounded, and the output of amplifier A2 terminates to resistance R in feedback circuit between grade5, resistance R5It is another
One end is fed back to across the reverse input end for hindering amplifier A1 in amplifying circuit.
2. a kind of high RST contrast photoelectric detective circuit for optical heterodyne detection according to claim 1, feature
It is：The opto-electronic conversion diode D1 is PIN photodiode.
3. a kind of high RST contrast photoelectric detective circuit for optical heterodyne detection according to claim 1 or 2, special
Sign is：It is described to be realized with the resistance for constituting backfeed loop by operational amplifier A DA4817 across resistance amplifying circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820474599.6U CN207964084U (en) | 2018-04-04 | 2018-04-04 | A kind of high RST contrast photoelectric detective circuit for optical heterodyne detection |
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| CN201820474599.6U CN207964084U (en) | 2018-04-04 | 2018-04-04 | A kind of high RST contrast photoelectric detective circuit for optical heterodyne detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108534893A (en) * | 2018-04-04 | 2018-09-14 | 西安工业大学 | A kind of photoelectric detective circuit for optical heterodyne detection |
| CN113670345A (en) * | 2021-08-10 | 2021-11-19 | 之江实验室 | Low-noise photoelectric detection device for decomposing photocurrent signal |
-
2018
- 2018-04-04 CN CN201820474599.6U patent/CN207964084U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108534893A (en) * | 2018-04-04 | 2018-09-14 | 西安工业大学 | A kind of photoelectric detective circuit for optical heterodyne detection |
| CN108534893B (en) * | 2018-04-04 | 2023-12-15 | 西安工业大学 | Photoelectric detection circuit for optical heterodyne detection |
| CN113670345A (en) * | 2021-08-10 | 2021-11-19 | 之江实验室 | Low-noise photoelectric detection device for decomposing photocurrent signal |
| CN113670345B (en) * | 2021-08-10 | 2023-09-15 | 之江实验室 | Low-noise photoelectric detection device for photoelectric current signal decomposition |
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