CN104198084B - Closed-loop feed-back type passive wave guide micro temperature sensor - Google Patents
Closed-loop feed-back type passive wave guide micro temperature sensor Download PDFInfo
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- CN104198084B CN104198084B CN201410425898.7A CN201410425898A CN104198084B CN 104198084 B CN104198084 B CN 104198084B CN 201410425898 A CN201410425898 A CN 201410425898A CN 104198084 B CN104198084 B CN 104198084B
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Abstract
The invention discloses a kind of closed-loop feed-back type passive wave guide micro temperature sensor, comprise 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 the second photoelectric detective circuit, signal processing circuit and the light source that connect successively and drives.The present invention is passive device, can be applied to strong-electromagnetic field, the severe place such as inflammable and explosive; In addition, the present invention is based on the detection of principle realization to temperature of interference, highly sensitive; Adopt optical fiber to be connected with sensor, nothing electricity is radiationless and optical fiber cost is extremely low.
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 such as inflammable and explosive environment such as electric system High Voltage electromagnetic field environment and oil, natural gas pipe, colliery, to the detection of temperature very urgent.Once temperature exceedes threshold value, cause great destruction by the people's lives and property safety and even nation's security, be therefore badly in need of carrying out effective temperature monitoring.But the many need of traditional temperature sensor provide additional power source to work, if in above-mentioned severe field work, very large potential safety hazard can be brought.Therefore, in the urgent need to a kind of passive temperature sensor, the temperature monitoring to environment is realized.
For the problems referred to above, current industry has proposed the temperature-sensing system based on optical fiber.By common telecommunication optical fiber as sensor.Time the physical quantity such as stress etc. be applied on optical fiber when the external world changes, corresponding change will be there is by each parameter such as phase place, amplitude, the frequency etc. of the light of optical fiber.Extraneous situation can be found out by monitoring these variable quantities.At present, mainly have employed the temperature sensor technology based on fiber grating (FBG) based on the safety monitoring system of optical fiber.It is comparatively ripe that FBG technology has developed, but program 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 Mach-Zehnder interferometer make use of the light path that two-way experienced by complete different path, any instability of these two light path phase places and polarization all can cause Mach-Zehnder interferometer unstable, therefore this strongly limits 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 the second photoelectric detective circuit, signal processing circuit and the light source that connect successively and drives.
The optical output port of described light source is connected with the first port of the first fiber coupler, second port of described first fiber coupler and the 3rd port are connected with the second port of the second fiber coupler, the 3rd port, and are wherein provided with on the way by thermode respectively; First port of described second fiber coupler is connected with the first port of the 3rd fiber coupler, second port of described 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.
Utilize the error that closed-loop feedback manner compensation Mach-Zehnder interferometer non-linearity brings, 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 present invention is based on the detection of principle realization to temperature of interference, highly sensitive; Adopt optical fiber to be connected with sensor, nothing electricity is radiationless and optical fiber cost is extremely low.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
Embodiment
As shown in Figure 1, the present invention mainly comprises the first fiber coupler 2, second fiber coupler the 3, three fiber coupler 4 is 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.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 into through the optical output port 1a of light source in the first port 2a in the first fiber coupler 2.Light is divided into two in the first fiber coupler 2, sends into the second port 3b of the second fiber coupler 3 and sent into the 3rd port 3c of the second fiber coupler 3 by its 3rd port 2c respectively by its second port 2b.Wherein be provided with on the way by thermode.
Light signal exports from the first port 3a of the second fiber coupler 3, sends into the first port 4a of the 3rd fiber coupler 4.Wherein the light of 90% exports from the second port 4b of the 3rd fiber coupler 4, sends into the first photoelectric detective circuit 5 eventually through optical fiber through the input port 5a of the first photoelectric detective circuit 5.
The light signal of another part 10% is exported by the 3rd port 4c of the 3rd fiber coupler 4, sends 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 is sent in signal processing circuit 7 through the input end 7a port of signal processing circuit 7 by the electric port 6b of the second photoelectric detective circuit 6.Sent in the port 8a of light source driving circuit 8 by its output port 7b after the treated circuit 7 of signal processes.Light source driving circuit is according to the signal adjustment light source drive current 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.
When the temperature of the surrounding them that is heated changes, the phase place through this position lights will change, and adopt Mach-Zehnder interferometer that phase place change information is converted to op-tical power information, photoelectric detective circuit transfers optical power signals to voltage signal.Therefore, by detecting the output voltage signal of photoelectric detective circuit, extraneous temperature information can indirectly be learnt.
In a word, the present invention proposes the nonlinear compensation scheme based on close-loop feedback principle, a part is isolated by Mach-Zehnder interferometer output optical signal, through signal transacting, control light source drive current, final control light source output optical signal, 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 characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different 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 (2)
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 the second photoelectric detective circuit (6), signal processing circuit (7) and the light source that connect successively and drives (8);
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 first fiber coupler and the 3rd port (2c) are connected with second port (3b) of the second fiber coupler (3), the 3rd port (3c), and are wherein provided with on the way by thermode respectively;
First port of described second fiber coupler (3) is connected with first port (4a) of the 3rd fiber coupler (4), second port (4b) of described 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.
2. closed-loop feed-back type passive wave guide micro temperature sensor as claimed in claim 1, is characterized in that, utilize the error that closed-loop feedback manner compensation Mach-Zehnder interferometer non-linearity brings, described light source is DFB coaxial packaging laser instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 CN104198084A (en) | 2014-12-10 |
| CN104198084B true CN104198084B (en) | 2015-08-26 |
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| 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 |
Citations (5)
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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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- 2014-08-26 CN CN201410425898.7A patent/CN104198084B/en active Active
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 |
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