CN104198084A - Closed-loop feedback type passive waveguide micro temperature sensor - Google Patents
Closed-loop feedback type passive waveguide micro temperature sensor Download PDFInfo
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- CN104198084A CN104198084A CN201410425898.7A CN201410425898A CN104198084A CN 104198084 A CN104198084 A CN 104198084A CN 201410425898 A CN201410425898 A CN 201410425898A CN 104198084 A CN104198084 A CN 104198084A
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Abstract
The invention discloses a closed-loop feedback type passive waveguide micro temperature sensor. The closed-loop feedback type passive waveguide micro temperature sensor comprises a light source, a first optical fiber coupler, a second optical fiber coupler, a third optical fiber coupler, a first photoelectric detection circuit and a feedback circuit, wherein the feedback circuit comprises a second photoelectric detection circuit, a signal processing circuit and a light source diver which are connected in turn. The closed-loop feedback type passive waveguide micro temperature sensor is a passive device and can be applied to the strong electromagnetic field and flammable and explosive bad places; the detection on the temperature is achieved based on the principle of interference and accordingly the sensitivity is high; an optical fiber is connected with the sensor and accordingly the electricity and the radiation are not produced and the optical fiber is low in cost.
Description
Technical field
The invention belongs to Fibre Optical Sensor and temperature detection field, in particular for the closed-loop feed-back type passive wave guide micro temperature sensor of temperature detection in the rugged surroundings such as inflammable and explosive or strong-electromagnetic field.
Background technology
For the inflammable and explosive environment such as such as electric system High Voltage electromagnetic field environment and oil, natural gas pipe, colliery, to very urgent of the detection of temperature.Once temperature exceedes threshold value, will the people's lives and property safety and even nation's security be caused to great destruction, be therefore badly in need of carrying out effective temperature monitoring.But traditional temperature sensor needs to provide additional power source to work more, if in above-mentioned severe field work, can bring very large potential safety hazard.Therefore,, in the urgent need to a kind of passive temperature sensor, realize the temperature monitoring to environment.
For the problems referred to above, industry has proposed the temperature-sensing system based on optical fiber at present.By common telecommunication optical fiber as sensor.In the time that the external world is applied to such as stress etc. of physical quantity on optical fiber and changes, will there is corresponding variation as phase place, amplitude, frequency etc. in each parameter of the light by optical fiber.Can find out extraneous situation by monitoring these variable quantities.At present, the safety monitoring system based on optical fiber has mainly adopted the temperature sensor technology based on fiber grating (FBG).It is comparatively ripe that FBG technology has developed, but this scheme sensitivity is lower, cannot detect small temperature variation.In order to improve the sensitivity of temperature probe, and make that its volume is little, compact conformation and lightweight, industry starts to adopt Mach-Zehnder interferometer as the main function components in temperature probe, but because having utilized two-way, Mach-Zehnder interferometer experiences the light path in complete different paths, any instability of these two light path phase places and polarization all can cause Mach-Zehnder interferometer unstable, and therefore this has greatly limited the application of Mach-Zehnder interferometer in the middle of Practical Project.
Summary of the invention
Goal of the invention: provide a kind of closed-loop feed-back type passive wave guide micro temperature sensor, to solve the problems referred to above of prior art.
Technical scheme: a kind of closed-loop feed-back type passive wave guide micro temperature sensor, comprises light source, the first fiber coupler, the second fiber coupler, the 3rd fiber coupler, the first photoelectric detective circuit and backfeed loop; Described backfeed loop comprises that the second photoelectric detective circuit, signal processing circuit and the light source that connect successively drive.
The optical output port of described light source is connected with the first port of the first fiber coupler, the second port of described the first fiber coupler is connected, and is wherein provided with on the way and is subject to thermode with the second port, the 3rd port of the second fiber coupler respectively with the 3rd port; The first port of described the second fiber coupler is connected with the first port of the 3rd fiber coupler, the second port of described the 3rd fiber coupler is connected with the first port of the first photoelectric detective circuit, the second photoelectric detective circuit respectively with the 3rd port, and the output port that described light source drives is connected with the input port of light source.
The error of utilizing closed-loop feedback manner compensation Mach-Zehnder interferometer non-linearity to bring, described light source is DFB coaxial packaging laser instrument.
Beneficial effect: the present invention is passive device, can be applied to strong-electromagnetic field, the severe place such as inflammable and explosive; In addition, the principle that the present invention is based on interference realizes the detection to temperature, highly sensitive; Adopt optical fiber to be connected with sensor, nothing electricity is radiationless and optical fiber cost is extremely low.
Brief description of the drawings
Fig. 1 is structure principle chart of the present invention.
Embodiment
As shown in Figure 1, the present invention mainly comprises that the first fiber coupler 2, the second fiber coupler 3, the three fiber couplers 4 are 1 × 2 fiber couplers.In the present embodiment, light source adopts DFB coaxial packaging laser instrument.Optical fiber adopts the G652 optical fiber of Corning Incorporated.The first photoelectric detective circuit 1 and the second photoelectric detective circuit 2 are made up of photodiode, operational amplifier LF353 and corresponding resistance, capacity cell.
The light that light source 1 sends is sent in the first port 2a in the first fiber coupler 2 through the optical output port 1a of light source.Light is divided into two in the first fiber coupler 2, sends into the second port 3b of the second fiber coupler 3 respectively and send into the 3rd port 3c of the second fiber coupler 3 by its 3rd port 2c by its second port 2b.Wherein be provided with on the way and be subject to thermode.
Light signal, from the first port 3a output of the second fiber coupler 3, is sent into the first port 4a of the 3rd fiber coupler 4.Wherein 90% light, from the second port 4b output of the 3rd fiber coupler 4, is finally sent into the first photoelectric detective circuit 5 by optical fiber through the input port 5a of the first photoelectric detective circuit 5.
The light signal of another part 10%, by the 3rd port 4c output of the 3rd fiber coupler 4, is sent into the port 6a of the second photoelectric detective circuit 6.Optical power signals is converted to voltage signal by the second photoelectric detective circuit, and send in signal processing circuit 7 through the input end 7a of signal processing circuit 7 port by the electric port 6b of the second photoelectric detective circuit 6.The treated circuit 7 of signal is sent in the port 8a of light source driving circuit 8 by its output port 7b after processing.Light source driving circuit is adjusted light source drive current according to the signal of input.Current signal is sent into light source through the output port 8b of light source drive current 8 and is driven 1 input port 1b.
In the time changed by thermode temperature around, will change through the phase place of this position lights, adopt Mach-Zehnder interferometer that phase place change information is converted to luminous power information, photoelectric detective circuit transfers optical power signals to voltage signal.Therefore,, by detecting the output voltage signal of photoelectric detective circuit, can indirectly learn extraneous temperature information.
In a word, the present invention proposes the nonlinear compensation scheme based on close-loop feedback principle, to in Mach-Zehnder interferometer output optical signal, isolate a part, through signal processing, control light source drive current, the final light source output optical signal of controlling, realizes the linear corresponding relation between sensor output intensity and temperature.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple equivalents to technical scheme of the present invention, these equivalents all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode.For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out combination in any between various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (3)
1. a closed-loop feed-back type passive wave guide micro temperature sensor, it is characterized in that, comprise light source (1), the first fiber coupler (2), the second fiber coupler (3), the 3rd fiber coupler (4), the first photoelectric detective circuit (5) and backfeed loop; Described backfeed loop comprises that the second photoelectric detective circuit (6), signal processing circuit (7) and the light source that connect successively drive (8).
2. closed-loop feed-back type passive wave guide micro temperature sensor as claimed in claim 1, it is characterized in that, the optical output port (1a) of described light source (1) is connected with first port (2a) of the first fiber coupler, second port (2b) of described the first fiber coupler is connected, and is wherein provided with on the way and is subject to thermode with the second port (3b), the 3rd port (3c) of the second fiber coupler (3) respectively with the 3rd port (2c);
The first port of described the second fiber coupler (3) is connected with first port (4a) of the 3rd fiber coupler (4), second port (4b) of described the 3rd fiber coupler (4) is connected with first port (6a) of the first photoelectric detective circuit, the second photoelectric detective circuit respectively with the 3rd port (4c)
The output port (8b) that described light source drives is connected with the input port (1b) of light source.
3. closed-loop feed-back type passive wave guide micro temperature sensor as claimed in claim 1, is characterized in that, the error of utilizing closed-loop feedback manner compensation Mach-Zehnder interferometer non-linearity to bring, and described light source is DFB coaxial packaging laser instrument.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410425898.7A CN104198084B (en) | 2014-08-26 | 2014-08-26 | Closed-loop feed-back type passive wave guide micro temperature sensor |
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| CN201410425898.7A CN104198084B (en) | 2014-08-26 | 2014-08-26 | Closed-loop feed-back type passive wave guide micro temperature sensor |
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| CN104198084A true CN104198084A (en) | 2014-12-10 |
| CN104198084B CN104198084B (en) | 2015-08-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732405A (en) * | 2018-06-19 | 2018-11-02 | 南京工程学院 | A kind of passive optical intensity modulation type current transformer and bus current detection method |
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| CN2804824Y (en) * | 2005-07-08 | 2006-08-09 | 深圳太辰光通信有限公司 | Optical fiber raster temp sensing and alarming device |
| CN201680924U (en) * | 2010-04-13 | 2010-12-22 | 中国计量学院 | Distributive optical fiber Raman and Brillouin scattering sensor |
| CN102680138A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Double-direction four-channel coupled distribution-type optical-fiber Raman temperature measuring system |
| CN202533198U (en) * | 2012-03-26 | 2012-11-14 | 湖北擎宇科技有限公司 | Distributed fiber Brillouinstrain strain and temperature sensor |
| CN203274951U (en) * | 2013-05-24 | 2013-11-06 | 武汉新烽光电科技有限公司 | Tiled-type optical-fiber temperature sensor system |
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2014
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2804824Y (en) * | 2005-07-08 | 2006-08-09 | 深圳太辰光通信有限公司 | Optical fiber raster temp sensing and alarming device |
| CN201680924U (en) * | 2010-04-13 | 2010-12-22 | 中国计量学院 | Distributive optical fiber Raman and Brillouin scattering sensor |
| CN202533198U (en) * | 2012-03-26 | 2012-11-14 | 湖北擎宇科技有限公司 | Distributed fiber Brillouinstrain strain and temperature sensor |
| CN102680138A (en) * | 2012-06-07 | 2012-09-19 | 北京航空航天大学 | Double-direction four-channel coupled distribution-type optical-fiber Raman temperature measuring system |
| CN203274951U (en) * | 2013-05-24 | 2013-11-06 | 武汉新烽光电科技有限公司 | Tiled-type optical-fiber temperature sensor system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108732405A (en) * | 2018-06-19 | 2018-11-02 | 南京工程学院 | A kind of passive optical intensity modulation type current transformer and bus current detection method |
| CN108732405B (en) * | 2018-06-19 | 2020-05-05 | 南京工程学院 | Passive optical intensity modulation type current transformer and bus current detection method |
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| CN104198084B (en) | 2015-08-26 |
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