CN108534893B - Photoelectric detection circuit for optical heterodyne detection - Google Patents
Photoelectric detection circuit for optical heterodyne detection Download PDFInfo
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- CN108534893B CN108534893B CN201810299280.9A CN201810299280A CN108534893B CN 108534893 B CN108534893 B CN 108534893B CN 201810299280 A CN201810299280 A CN 201810299280A CN 108534893 B CN108534893 B CN 108534893B
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- 238000001514 detection method Methods 0.000 title claims abstract description 52
- 230000003287 optical effect Effects 0.000 title claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 230000003321 amplification Effects 0.000 abstract description 7
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 7
- 238000002955 isolation Methods 0.000 abstract description 4
- 230000035559 beat frequency Effects 0.000 abstract 1
- 239000013307 optical fiber Substances 0.000 description 16
- 238000005259 measurement Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 239000003990 capacitor Substances 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
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003595 spectral effect Effects 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 photoelectric detection circuit for optical heterodyne detection, which comprises: the photoelectric conversion device comprises a photoelectric conversion diode, a transimpedance amplifying circuit, a first-order RC low-pass filter circuit, an in-phase proportional operational amplifying circuit and an interstage feedback circuit. The photoelectric conversion diode converts the optical signal into a current signal and outputs the current signal to an inverting input end of the operational amplifier of the transimpedance amplifying circuit, the non-inverting input end of the operational amplifier is grounded, the output of the transimpedance amplifying circuit is connected with a first-order RC low-pass filter circuit, the first-order RC low-pass filter circuit is connected with the non-inverting input end of the non-inverting proportion operational amplifier circuit, the interstage feedback circuit is connected with a resistor from the output end of the non-inverting proportion operational amplifier circuit and then fed back to the input end of the transimpedance amplifying circuit from the other end of the resistor, and the inverting input end of the non-inverting proportion operational amplifier circuit is connected with the resistor and then grounded. The photoelectric detection circuit can realize the functions of direct current isolation and alternating current amplification of the optical heterodyne detection signal, thereby effectively improving the contrast ratio of the optical heterodyne detection beat frequency signal.
Description
Technical field:
the invention relates to the technical field of optical heterodyne detection circuits, in particular to a photoelectric detection circuit for optical heterodyne detection.
The background technology is as follows:
with the rapid development of the optical detection technology, the optical detection has wide application in the aspects of ranging, displacement measurement, speed measurement and the like. The light detection technology mainly comprises two types: light direct detection and light heterodyne detection. The direct detection method is simple and easy to realize, but can not acquire all information of the signal, and has low signal-to-noise ratio. The optical heterodyne detection has high detection sensitivity, can obtain all information of signals, has higher signal to noise ratio, is suitable for weak signal detection and has good filtering performance, but the optical heterodyne detection method has lower signal contrast ratio due to larger difference between the power of reference light and the power of signal light. In a typical acousto-optic frequency shifter frequency shift measuring device, the device comprises a DFB laser, an optical fiber isolator, an optical fiber beam splitter, an optical fiber beam combiner, an acousto-optic frequency shifter, an optical fiber attenuator and a photoelectric detection circuit, wherein the photoelectric detection circuit generally adopts a method for reducing reference optical power to be close to signal optical power in order to improve the contrast of signals, but the method can cause the sensitivity of the photoelectric detection circuit to be reduced.
The invention comprises the following steps:
aiming at the defects of the existing photoelectric detection circuit for optical heterodyne detection, the invention provides the photoelectric detection circuit for optical heterodyne detection, and the contrast of the optical heterodyne beat signal can be improved under the condition that the sensitivity of the photoelectric detection circuit is not reduced by DC isolation and AC amplification of an optical heterodyne detection signal.
In order to achieve the above object, the present invention provides a photodetection circuit for optical heterodyne detection, which includes a photodiode D1, a transimpedance amplifying circuit, a first-order RC low-pass filter circuit, an in-phase proportional operational amplifying circuit and an inter-stage feedback circuit; the photoelectric conversion diode D1 converts the optical signal into a current signal and outputs the current signal to the inverting input end of the operational amplifier A1 in the transimpedance amplifying circuit, the non-inverting input end is grounded, and the resistor R 1 One end is connected with the output end of the operational amplifier A1, and the other end is connected with the reverse input end of the operational amplifier A1; the output of the operational amplifier A1 is connected with a resistor R in a first-order RC low-pass filter circuit 2 Resistance R 2 The non-inverting input end of the operational amplifier A2 in the non-inverting proportion operational amplifier circuit is connected with the inverting input end of the operational amplifier A2 in the non-inverting proportion operational amplifier circuit to be connected with the resistor R 4 And then grounded, resistance R 3 One end of the resistor is connected with the reverse input end of the operational amplifier A2, the other end of the resistor is grounded, and the output end of the operational amplifier A2 in the interstage feedback circuit is connected with the resistor R 5 Resistance R 5 The other end of the output signal is fed back to the reverse input end of the operational amplifier A1 in the transimpedance amplifier circuit.
Further, the photodiode D1 is a PIN photodiode.
Further, the transimpedance amplifier circuit is realized by an operational amplifier ADA4817 and a resistor forming a feedback loop.
Compared with the prior art, the invention has the beneficial effects that:
the direct current component and the alternating current component of the photocurrent signal are separated through the interstage feedback circuit, so that different amplification of direct current and alternating current gains is realized, and the contrast of the heterodyne beat signal is improved when the reference light power and the signal light power have larger phase difference.
Drawings
FIG. 1 is a schematic diagram of a photo detection circuit for optical heterodyne detection in accordance with the present invention;
FIG. 2 is a schematic diagram of a typical acousto-optic frequency shifter frequency shift amount measurement device;
FIG. 3 is a heterodyne beat signal obtained by a conventional photo detection circuit;
fig. 4 is a heterodyne beat signal obtained by the photodetection circuit of the present invention.
In the figure, a 1-DFB laser, a 2-optical fiber isolator, a 3-1×2 optical fiber beam splitter, a 4-acousto-optic frequency shifter, a 5-optical fiber attenuator, a 6-2×1 optical fiber beam combiner and a 7-photoelectric detection circuit.
Detailed Description
For the purpose of promoting an understanding of the principles and advantages of the invention, reference will now be made in detail to the drawings and it is apparent that the embodiments described are only some, but not all embodiments. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of this protection.
Referring to fig. 1, a photo detection circuit for optical heterodyne detection includes: the photoelectric conversion circuit comprises a photoelectric conversion diode, a transimpedance amplifying circuit, a first-order RC low-pass filter circuit, an in-phase proportional operation circuit and an interstage feedback circuit. The output of the photoelectric conversion diode D1 is connected with the reverse input end of the operational amplifier A1 in the transimpedance amplifying circuit, the non-inverting input end of the operational amplifier A1 in the transimpedance amplifying circuit is grounded, and the resistor R 1 One end is connected with the output end of the operational amplifier A1, and the other end is connected with the reverse input end of the operational amplifier A1; the output of the operational amplifier A1 is connected with a resistor R in a first-order RC low-pass filter circuit 2 Resistance R 2 Back-connected capacitor C 1 And then to ground, the positive output end of the operational amplifier A2 in the in-phase proportion operational amplifier circuit is connected to the resistor R 2 And capacitor C 1 A junction of (2), a resistance R 4 One end of the resistor is connected with the output end of the operational amplifier A2, the other end of the resistor is grounded through the resistor R3, and is connected with the reverse input end of the operational amplifier A2, and the resistor R in the interstage feedback resistor 5 One end of the filter is connected with the feedback of the output end of the operational amplifier A1 in the in-phase proportional operational amplifier circuit, and the other end of the filter is connected with the reverse input end of the operational amplifier A1 in the transimpedance amplifier circuit.
The transimpedance amplifying circuit is realized by an operational amplifier ADA4817 and a resistor forming a feedback loop;
the first-order RC low-pass filter circuit is realized by connecting RC circuits in series, and has a large time constant and a very low cut-off frequency.
The photoelectric detection circuit for heterodyne detection has the basic principle that: the photodiode converts an optical signal into a current signal, and the current signal contains both an ac component and a dc component. For photoelectric detection, the change of the target to be detected is only reflected in an alternating current component part, and the direct current component does not contain information of light measurement.
The photoelectric conversion diode receives luminous flux on the photosensitive surface to generate a current signal I 0 Current signal I at this time 0 Containing both DC signals I d Also contains AC signal I a 。
(1) For AC signal I a Part, I a Cannot flow through R 5 All flow through R 1 Due to R 2 And C 1 The low-pass filters are formed in series, so that all alternating current signals are output at the output end of the operational amplifier A1, and the alternating current signals are prevented from being lost. An alternating voltage signal is generated at the output end of the operational amplifier A1, so that the alternating-current transimpedance amplification function is realized.
(2) For DC signal I d Part is divided into two paths I d1 And I d2 ，I d1 Partial flow through R 5 ，I d2 Partial flow through R 1 . Analysis of flow through R 1 Current I at d2 The output power of the operational amplifier A2 can be obtained according to the characteristics of the operational amplifierPressing:
then there are:
analysis of flow through R 1 Current I at d2 Can be pushed to:
the direct current component on the transimpedance amplifying circuit and the inter-stage feedback circuit can be obtained according to the above reasoning, and the proportion relation of the direct current component is as follows:
recording device(voltage amplification of second-stage operational amplifier), then
It can be seen that the direct current component generated by the photodiode under the condition of receiving luminous flux from the photosurface flows through R according to a certain proportion 1 And R is 6 The specific proportion is
The operational amplifier A1 selects the operational amplifier ADA4817 and the operational amplifier A2 selects the operational amplifier AD 8065, and the resistance values of the resistors in the circuit are respectively as follows: r is R 1 ＝10K,R 2 ＝100K,R 3 ＝1K,R 4 ＝5K,R 5 ＝100Ω,C 1 =10μf. Can be derived from I d2 ：I d1 Compared with the alternating current component, the direct current component is lower by 2 orders of magnitude and can be ignored, and the functions of direct current isolation and alternating current amplification are realized.
Referring to fig. 2, which is a schematic diagram of a typical acousto-optic frequency shifter frequency shift amount measuring apparatus, the present invention provides a photo detection circuit 7 therein. In a typical acousto-optic frequency shifter frequency shift measuring device, a laser beam output by a DFB laser 1 is connected with the input end of an optical fiber isolator 2, and the output end of the optical fiber isolator 2 is connected with a spectral ratio of 1:1 x 2 optical fiber beam splitter 3, the output end of the optical fiber beam splitter 3 splits two beams of light, the first split beam of light is connected with the input end of an acousto-optic frequency shifter 4, the output end of the acousto-optic frequency shifter 4 is connected with the input end of an optical fiber attenuator 5, the output end of the optical fiber attenuator 5 and the second split beam of light of the optical fiber beam splitter 3 are connected with a2 x 1 optical fiber beam combiner 6 for heterodyne interference, and then a photoelectric detection circuit 7 performs signal processing.
When the optical power ratio of the input signal light to the reference light is 1:600, the theoretical ratio of the direct current voltage to the alternating current voltage measured by the traditional photoelectric detection circuit is 1:6.1, the actual measurement is 1:5.7, and the two are in agreement. Fig. 3 shows an optical heterodyne beat signal obtained by using a conventional photoelectric detection circuit, and it can be seen that the signal has a larger direct current component, and the beat signal has a lower contrast.
The optical heterodyne beat signal obtained by the photoelectric detection circuit 7 is shown in fig. 4, so that the direct current signal of the beat signal is obviously suppressed, the direct current isolation and alternating current amplification effects are realized, and the contrast of the beat signal is obviously improved.
Claims (3)
1. A photo detection circuit for optical heterodyne detection, characterized in that: the circuit comprises a photoelectric conversion diode D1, a transimpedance amplifying circuit, a first-order RC low-pass filter circuit, an in-phase proportional operational amplifying circuit and an interstage feedback circuit; the photoelectric conversion diode D1 converts an optical signal into a current signal and outputs the current signal to an inverting input end of the operational amplifier A1 in the transimpedance amplifying circuit, the non-inverting input end of the photoelectric conversion diode D1 is grounded, one end of the first resistor is connected with an output end of the operational amplifier A1, and the other end of the first resistor is connected with an inverting input end of the operational amplifier A1; the output of the operational amplifier A1 is connected with a second resistor in the first-order RC low-pass filter circuit, the second resistor is connected with the in-phase input end of the operational amplifier A2 in the in-phase proportion operational amplifier circuit, the reverse input end of the operational amplifier A2 in the in-phase proportion operational amplifier circuit is connected with a fourth resistor and then grounded, one end of the third resistor is connected with the reverse input end of the operational amplifier A2, the other end of the third resistor is grounded, the output end of the operational amplifier A2 in the interstage feedback circuit is connected with a fifth resistor, and the other end of the fifth resistor is fed back to the reverse input end of the operational amplifier A1 in the transimpedance amplifier circuit.
2. A photo detection circuit for optical heterodyne detection according to claim 1, wherein: the photodiode D1 is a PIN photodiode.
3. A photo detection circuit for optical heterodyne detection according to claim 1 or 2, characterized in that: the transimpedance amplifier circuit is implemented by an operational amplifier ADA4817 and a first resistor constituting a feedback loop.
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| Application Number | Priority Date | Filing Date | Title |
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| 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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| CN108534893A CN108534893A (en) | 2018-09-14 |
| CN108534893B true CN108534893B (en) | 2023-12-15 |
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| CN110061779B (en) * | 2019-04-28 | 2021-04-27 | 重庆三峡学院 | Optical fiber communication system |
| CN112304429B (en) * | 2020-10-23 | 2022-09-30 | 苏州坤元微电子有限公司 | Photoelectric detection circuit |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN205404857U (en) * | 2016-03-21 | 2016-07-27 | 南京信息工程大学 | Meteorological instrument leaks current detection system |
| CN106768321A (en) * | 2015-11-23 | 2017-05-31 | 史树元 | A kind of Optic-Electric Detecting Circuit for weak signal |
| CN107525974A (en) * | 2017-09-06 | 2017-12-29 | 武汉旗云高科工程技术有限公司 | A kind of Lightning Warning method and speed antenna integral type electric field change measuring instrument |
| CN207964084U (en) * | 2018-04-04 | 2018-10-12 | 西安工业大学 | A kind of high RST contrast photoelectric detective circuit for optical heterodyne detection |
-
2018
- 2018-04-04 CN CN201810299280.9A patent/CN108534893B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN205404857U (en) * | 2016-03-21 | 2016-07-27 | 南京信息工程大学 | Meteorological instrument leaks current detection system |
| CN107525974A (en) * | 2017-09-06 | 2017-12-29 | 武汉旗云高科工程技术有限公司 | A kind of Lightning Warning method and speed antenna integral type electric field change measuring instrument |
| CN207964084U (en) * | 2018-04-04 | 2018-10-12 | 西安工业大学 | A kind of high RST contrast photoelectric detective circuit for optical heterodyne detection |
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