CN101893452B - Device for eliminating common mode component coefficient of interference optical signals - Google Patents
Device for eliminating common mode component coefficient of interference optical signals Download PDFInfo
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- CN101893452B CN101893452B CN 200910051597 CN200910051597A CN101893452B CN 101893452 B CN101893452 B CN 101893452B CN 200910051597 CN200910051597 CN 200910051597 CN 200910051597 A CN200910051597 A CN 200910051597A CN 101893452 B CN101893452 B CN 101893452B
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Abstract
The invention aims to solve the technical problem to provide a device for eliminating a common mode component coefficient of interference optical signals. The device comprises a first photoelectric path and a second photoelectric path. The first photoelectric path comprises a photoelectric detector 1 and an amplifying circuit 1. Similarly, the second photoelectric path comprises a photoelectric detector 2 and an amplifying circuit 2. A programmable attenuator or amplifier and a detection input end of a detection and adjustment interface are connected between the amplifying circuit 1 and a differential amplifier and are used for detecting the waveform of a first voltage signal through an oscilloscope. If the waveform common mode components of the detected first and second voltage signals are different, the waveform common mode components of the detected first and second voltage signals are adjusted to be consistent by adjusting the programmable attenuator or amplifier through the detection and adjustment interface, so that the first voltage signal and the second voltage signal transmitted to the amplifying circuit are two voltage signals with the same common mode component. A differential amplifying circuit performs subtraction calculation on the two voltage signals without difference. Therefore, accurate differential mode signals are obtained, and the function of eliminating the common mode signal coefficient is realized.
Description
Technical field
The present invention relates to the optical fiber vibration sensing technology, relate in particular to a kind of common mode component coefficient cancellation element of interference light signal.
Background technology
Tell the light of two-way symmetry after the 3x3 coupling mechanism that light is selected for use is interfered the reflected light in the detection optical fiber in the general interferometer that adopts in optical fiber vibration sensing field, be converted to voltage signal through photoelectric commutator again, extract useful signal afterwards.Comprising common mode component and difference component in this two ways of optical signals.In actual applications, described difference component is actual useful signal.In the prior art, each road light signal is carried out the photoelectricity amplification do subtraction again, and then obtain differential signal, be illustrated in fig. 1 shown below.
This all is feasible as a rule, can eliminate common mode component (" A " in the formula " U=A-b ") by above-mentioned differential operational device, obtains the difference mode signal 2b relevant with optical fiber somewhere vibration signal.
Yet in actual applications, environmental indexs such as the suffered pressure of optical fiber, stress temperature all were not quite similar during the decay of the loss of welding node, joint was particularly used in the open air, and this common mode component coefficient of two-way that all can cause being input to photodetector is inconsistent.Will make output signal whole drift occur so in actual applications, even it is saturated the output of differential amplifier circuit to occur.
Summary of the invention
Technical matters to be solved by this invention is: a kind of common mode component coefficient cancellation element of interference light signal is provided, can makes the precision of extracting difference mode signal in the vibrating sensing technology more accurate.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of common mode component coefficient cancellation element of interference light signal comprises interference light signal light path and detects and regulate interface.Described light path comprises the two-way reflected light of interferometer, obtain the voltage signal of described first light signal and second light signal through detector 1 and detector 2, described first voltage signal and second voltage signal after each amplifying circuit 1 and amplifying circuit 2 amplifications, are exported to differential amplifier circuit and are obtained useful difference mode signal at last again.
Arrange between described amplifying circuit 1, amplifying circuit 2 and the described differential amplifier circuit and detect and two collection lines regulating interface, it is characterized in that,, according to common mode component and the residual quantity component of detection waveform described voltage signal is regulated then detecting and regulating the waveform that interface can detect two voltage signals by two collection signal wires.
Between described amplifying circuit 1 and the described differential amplifier circuit program control amplification or attenuator are set, its control end is connected to and detects and the adjusting interface, detects and regulates interface and can regulate its amplification or the multiple of first voltage signal of decaying.
The present invention at first extracts the common mode component of the voltage signal in the two-way photoelectricity path, detect described common mode component by detecting with the adjusting interface, voltage signal is regulated by described program control amplification or attenuator according to testing result again, and then eliminated the common mode component coefficient.Afterwards, it is higher to obtain the differential-mode component accuracy of big voltage signal by differential amplifier circuit.
Description of drawings
Fig. 1 is the synoptic diagram of existing interference light signal differential-mode component extraction element.
Fig. 2 is the synoptic diagram of common-mode signal coefficient cancellation element of the present invention.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
Show the common-mode signal coefficient cancellation element of the preferred embodiment according to the present invention as Fig. 2.Comprise the first photoelectricity path and the second photoelectricity path.The first photoelectricity path comprises photodetector 1 and amplifying circuit 1.Similarly, the second photoelectricity path comprises photodetector 2 and amplifying circuit 2.
Photodetector 1 and photodetector 2 are surveyed two-way that interferometer the spreads out of light that is associated respectively and are converted the voltage signal that comprises differential-mode component and common mode component that is associated to.In the present embodiment, establishing first voltage signal that photodetector 1 records is U
1=μ (A-b), and second voltage signal that photodetector 202 records is U
2=A+b, wherein A is the common mode component in the light signal, b is the differential-mode component of light signal.Because A is common mode component, b is differential-mode component, and therefore, the common mode component A of two ways of optical signals is identical, and differential-mode component b equal and opposite in direction, and the phase phasic difference is that fixed value (for example selects for use branch/coupler phase place such as 1*n to differ 2 π/n).Common-mode signal coefficient μ represents the error that caused by device self and environment in addition, for example welding node loss, joint decay, the suffered pressure of optical fiber, stress temperature etc. in particularly using in the open air, the error of the light signal that causes.
Be connected program control decay or amplifier between described amplifying circuit 1 and the differential amplifier and detect and a detection input end regulating interface, in order to detect the waveform of first voltage signal by oscillograph.
Another of described detection and adjusting interface detects input end and is arranged between amplifying circuit 2 and the differential amplifier, in order to detect the waveform of second voltage signal by oscillograph.If the waveform common mode component difference of first and second voltage signal that detects is then passed through to detect and regulate interface and is regulated program control consistent the adjusting of the waveform common mode component of first and second voltage signal with droop amplifier.
Thus, first voltage signal and second voltage signal that passes to amplifying circuit is the voltage signal of two common mode component indifferences.Differential amplifier circuit carries out subtraction to the voltage signal of described two indifferences through amplifying, thereby obtains wherein difference mode signal accurately, reaches the function of eliminating the common-mode signal coefficient.
Above-described embodiment has following advantage.
1, can regulate the voltage signal on the photoelectricity path, eliminate the common-mode signal coefficient more accurately.
2, can guarantee the stability of common-mode signal coefficient cancellation element by described communication output port output diagnostic message.
Here description of the invention and application is illustrative, is not to want with scope restriction of the present invention in the above-described embodiments.Here the distortion of disclosed embodiment and change is possible, and the various parts of the replacement of embodiment and equivalence are known for those those of ordinary skill in the art.Those skilled in the art are noted that under the situation that does not break away from spirit of the present invention or essential characteristic, and the present invention can be with other forms, structure, layout, ratio, and realize with other elements, material and parts.Under the situation that does not break away from the scope of the invention and spirit, can carry out other distortion and change to disclosed embodiment here.
Claims (4)
1. the common mode component coefficient cancellation element of an interference light signal comprises that laser instrument connects interferometer, and interferometer is connecting detection optical fiber, at the tail end connection reflective mirror of detection optical fiber;
Described interferometer connects first photodetector and second photodetector, converts interferometer signal to voltage respectively, and first photodetector connects first amplifying circuit, and second photodetector connects second amplifying circuit, connects differential amplifier circuit at last; It is characterized in that, be connected with program control amplification or attenuator between first amplifying circuit and the differential amplifier circuit;
Described program control amplification or attenuator is characterized in that, its examined and adjusting port controlling, the electric signal of the place circuit of regulating or decay;
Described detection and adjusting port have two to detect input ends, and one is connected between program control amplification or attenuator and the differential amplifier circuit, and another is connected between second amplifying circuit and the differential amplifier circuit.
2. the common mode component coefficient cancellation element of interference light signal according to claim 1 is characterized in that:
Two of described detection and adjusting port are detected input ends, the voltage of place circuit is input to detects and the adjusting port, and this port can show the waveform of two voltages.
3. the common mode component coefficient cancellation element of interference light signal according to claim 1 is characterized in that:
The control end of described program control amplification or attenuator is connected to detection and regulates port, can regulate the voltage of program control amplification or attenuator adjusting place circuit according to two voltage waveforms that this port shows by detecting and regulate port.
4. the common mode component coefficient cancellation element of interference light signal according to claim 1 is characterized in that:
Described voltage comprises common mode component and differential-mode component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200910051597 CN101893452B (en) | 2009-05-20 | 2009-05-20 | Device for eliminating common mode component coefficient of interference optical signals |
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| CN 200910051597 CN101893452B (en) | 2009-05-20 | 2009-05-20 | Device for eliminating common mode component coefficient of interference optical signals |
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| CN103308084B (en) * | 2013-06-28 | 2016-06-01 | 中国科学院长春光学精密机械与物理研究所 | A kind of photoelectric receiving transducer for increment type displacement measuring device |
| CN104779580B (en) * | 2015-04-16 | 2018-02-23 | 许继集团有限公司 | A kind of smooth differential protection |
| CN114236221B (en) * | 2021-10-13 | 2023-09-26 | 北京华峰测控技术股份有限公司 | Differential voltage measurement circuit, device and method |
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|---|---|---|---|---|
| EP0793079A2 (en) * | 1996-02-29 | 1997-09-03 | The Boeing Company | Fiber coupled interferometric displacement sensor |
| CN1503476A (en) * | 2002-11-27 | 2004-06-09 | 株式会社东芝 | Optical signal receiving circuit and optical signal receiving semciconductor device |
| CN200962255Y (en) * | 2006-10-16 | 2007-10-17 | 天津市金飞博光通讯技术有限公司 | Novel optical fiber vehicle detector |
| CN101335503A (en) * | 2007-06-28 | 2008-12-31 | 冲电气工业株式会社 | Preamplifier and light receiving device |
| US7477109B2 (en) * | 2004-09-27 | 2009-01-13 | Arshad Suhail Farooqui | Process and temperature-compensated transimpedance amplifier |
| CN201540155U (en) * | 2009-05-22 | 2010-08-04 | 上海华魏光纤传感技术有限公司 | Common-mode signal factor filtering device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0427733D0 (en) * | 2004-12-17 | 2005-01-19 | British Telecomm | Optical system |
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- 2009-05-20 CN CN 200910051597 patent/CN101893452B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0793079A2 (en) * | 1996-02-29 | 1997-09-03 | The Boeing Company | Fiber coupled interferometric displacement sensor |
| CN1503476A (en) * | 2002-11-27 | 2004-06-09 | 株式会社东芝 | Optical signal receiving circuit and optical signal receiving semciconductor device |
| US7477109B2 (en) * | 2004-09-27 | 2009-01-13 | Arshad Suhail Farooqui | Process and temperature-compensated transimpedance amplifier |
| CN200962255Y (en) * | 2006-10-16 | 2007-10-17 | 天津市金飞博光通讯技术有限公司 | Novel optical fiber vehicle detector |
| CN101335503A (en) * | 2007-06-28 | 2008-12-31 | 冲电气工业株式会社 | Preamplifier and light receiving device |
| CN201540155U (en) * | 2009-05-22 | 2010-08-04 | 上海华魏光纤传感技术有限公司 | Common-mode signal factor filtering device |
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| 一种新型高灵敏度光纤干涉仪;陈晓光;《光学学报》;19920229;第12卷(第2期);第188-192页 * |
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