CN2760526Y - Distributed optical fibre raster temperature detecting system - Google Patents

Distributed optical fibre raster temperature detecting system Download PDF

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Publication number
CN2760526Y
CN2760526Y CN 200420098662 CN200420098662U CN2760526Y CN 2760526 Y CN2760526 Y CN 2760526Y CN 200420098662 CN200420098662 CN 200420098662 CN 200420098662 U CN200420098662 U CN 200420098662U CN 2760526 Y CN2760526 Y CN 2760526Y
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CN
China
Prior art keywords
optical fiber
optical fibre
fiber
temperature detection
light source
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CN 200420098662
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Chinese (zh)
Inventor
耿玉桐
陈飙
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淄博思科电子技术开发有限公司
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Abstract

The utility model relates to a distributed optical fibre raster temperature detection system, which belongs to the technical field of measurement. The utility model comprises a laser source, an optical fibre coupler, an outer wire optical fibre, optical fibre raster sensors, a tunable optical fibre filter and an optical detector. The utility model is characterized in that the utility model is also provided with a spectrum analysis unit and a control and data processing unit, wherein the laser source is optically connected with one shunted port of the optical fibre coupler and the other shunted port of the optical fibre coupler is optically connected with the inner port of the optical detector through the tunable optical fibre filter. The road combination port of the optical fibre coupler is connected in series with at least two optical fibre raster sensors with different central wavelengths through the outer wire optical fibre, and the laser source, the tunable optical fibre filter and the optical detector are electrically connected with the spectrum analysis unit and the control and data processing unit through a bus. Due to the adoption of the optical fibre raster sensors with different raster parameters, the utility model reaches the purposes of both temperature measurement and addressing, and can be extensively used in the field of the detection of the operation statuses of various high-voltage electric power equipment.

Description

Distributed optical fiber grating temperature detection system

Technical field

The utility model belongs to fields of measurement, relates in particular to the system for detecting temperature that high voltage electric power equip ment joint temperature variation is measured in a kind of variation that utilizes the wavelength that detects light beam or light pulse.

Background technology

Become in electric system, in the high pressure major loop of distribution substation and electric supply installation, each transformer, current transformer, voltage transformer (VT), disconnector, the joint that isolating switch or other high-voltage switch gears are connected with line of electric force or high-tension cable, because line of electric force or the swing of cable or permanent worker's frequency vibration of power equipment, tend to cause the loosening of coupling bolt, cause the connecting portion contact resistance to increase, be subjected to contact position oxidation on metal surface degree, influence by factors such as current's intensity and interface pressure sizes, the temperature of joint can great changes will take place, so the actual temperature change of joint is the important operational factor of distribution equipment, in order to guarantee the safe operation of electric system, must the running temperature of above-mentioned joint regularly be detected preferably real-time continuous monitoring.

Because above-mentioned joint all is operated under the high-tension state, the measurement of its actual running temperature adopts indirect type to measure usually, becomes methods such as test piece, cured of solid or infrared temperature detection as early stage temperature.In recent years, various new detection methods or device constantly occur, as wireless transmit, the receiving trap that adopts among the Chinese patent CN2599554Y " power equipment junction surface on-line temperature monitoring instrument ", or disclosedly among the Chinese patent CN2599547Y " power high voltage contact optical fiber on-Line Monitor Device " isolate modes such as realizing conversion of signals and transmission with photoelectricity, its purpose all is to adopt a kind of method of non-direct electrical connection, measured temperature signal is sent out, to solve the High-Voltage Insulation problem in the signal transduction process.

Because said method can onlinely continuously carry out temperature detection, so can in time grasp the temperature rise variation tendency of joint, the actual operating state of accurate judgment device, scent a hidden danger in advance, advanced processing avoids causing big loss, and is significant to the safe operation that guarantees electric system.

Deficiencies such as but above-mentioned method or device have all that signal is subject to disturb in the transmission course of signal, can only detect the temperature variation of a point, not explosion-proof, user's acquisition cost or use cost are higher during actual enforcement.

Open day on August 14th, 2002, disclose in the Chinese invention patent application of publication number CN 1363828A a kind of " temp monitoring and alarming system with identity optical fibre raster ", it is by wideband light source, Y shape optical branching device, form with optical fiber grating, adjustable filter, photo-detector and corresponding optical fiber, lead, electronic circuit and sound and light alarm device entirely, wideband light source 1 is connected with a branch road port of Y shape optical branching device 2 by optical fiber 7, and the road port that closes of Y shape optical branching device 2 is connected in series with optical fiber grating 3 with a plurality of entirely by optical fiber 7; Another minute road port of Y shape optical branching device 2 is connected with the input port of adjustable filter 4 by optical fiber 7; The filtering output end mouth of adjustable filter 4 is connected with photo-detector 5 by optical fiber 7, and the electric signal output of photo-detector 5 is connected to sound and light alarm device 6 by lead 8 through special circuit; In its application documents, describedly be meant " be produced in the optical fiber of commaterial, specification, the identical a plurality of fiber gratings of grating constant " with the optical fiber grating entirely.Because fiber grating is subjected to temperature variation to cause that the grating physical size changes, and causes the wavelength of its reflectance spectrum to change, and then reflects tested measuring point variation of temperature situation.The on-line continuous temperature detection that it had both realized a plurality of check points has solved the High-Voltage Insulation problem in the signal transduction process again, has also avoided the anti-interference problem in wireless transmit, the receiving course.

But since this technical scheme adopt a plurality of grating constants identical entirely with the optical fiber grating as sensor, exist in a plurality of fiber gratings on being serially connected in an optical fiber (corresponding a plurality of tested measuring points), can't differentiate specifically is the deficiency that the operation overtemperature takes place which tested measuring point.

The utility model content

Technical problem to be solved in the utility model provides a kind of electrical insulation capability and good reliability, anti-interference, corrosion-resistant, explosion-proof ability is strong, can directly touch and desire measuring tape electricity object surfaces and directly detect its temperature value, can detect the running temperature at a plurality of power equipment cable splices place simultaneously, can also differentiate specifically is the distributed optical fiber grating temperature detection system of which tested measuring point generation overheating.

The technical solution of the utility model is: a kind of distributed optical fiber grating temperature detection system is provided, comprise broad band laser light source, tunable optical fiber filter, fiber coupler, outside line optical fiber, fiber-optic grating sensor, photo-detector module, it is characterized in that: also be provided with spectroscopy unit and control and data processing unit; Wherein, described broad band laser light source is connected with a branch road port light of at least one fiber coupler; Another of fiber coupler minute road port is connected with the input port light of photo-detector module through the tunable optical fiber filter; The road port that closes of fiber coupler is connected in series through outside line optical fiber and two fiber-optic grating sensors with different centre wavelengths at least; Described broad band laser light source, tunable optical fiber filter, photo-detector module are electrically connected through bus and spectroscopy unit and control and data processing unit.

Wherein, described fiber-optic grating sensor is the fiber-optic grating sensor with different grating pitches.

Its described control and data processing unit also are electrically connected with display unit and/or communication unit.

Its described broad band laser light source is the broad band laser light source that optical source wavelength covers the whole C wave band; Described broad band laser light source has the 3dB wavelength coverage of 40nm.

Its described display unit is a liquid crystal display circuit; Described photo-detector module is PIN type or APD type photodiode circuit; Described control and data processing unit comprise zero passage detection, amplification, mould/number conversion, sampling and microcontroller circuit at least.

Compared with the prior art, the utility model has the advantages that:

1. a plurality of grating sensors of series connection on the single channel optical fiber with different centre wavelengths, thereby measure dot number is many, measurement range is big, can discern the temperature of different measuring point;

2. because the skew reflection variation of temperature of the centre wavelength of grating sensor by reflectance spectrum, thereby whole detection system is not subjected to the influence of factors such as light source power and fibre-optical bending, and good reliability, antijamming capability are strong.

3. adopt fiber-optic grating sensor to detect, transmit the temperature detection signal of the joint of high voltage electric power equip ment, can directly touch and desire measuring tape electricity object surfaces and continuously, onlinely detect its temperature value, have high insulating property, anti-electromagnetic interference (EMI), advantage such as anticorrosive, explosion-proof, be particularly suitable for using under the rugged surroundings such as inflammable, explosive and strong-electromagnetic field.

Description of drawings

Fig. 1 is light path of the present utility model, circuit structure block scheme;

Fig. 2 is the electrical block diagram of the utility model control and data processing unit;

Fig. 3 be embodiment light path, circuit structure block scheme.

Among the figure, 1 is the broad band laser light source, 2 is the tunable optical fiber filter, 3,3-1,3-2,3-3 be fiber coupler, and 4 is the photo-detector module, 5 are outside line optical fiber, 6 is fiber-optic grating sensor, and 7 is spectroscopy unit, and 8 are control and data processing unit, 9 is display unit and/or communication unit, and 10 is bus.

Embodiment

Below in conjunction with drawings and Examples the utility model is described further.

Among Fig. 1, broad band laser light source 1 is connected with a branch road port a light of fiber coupler 3; Another of fiber coupler minute road port b is connected with the input port light of photo-detector module 4 through tunable optical fiber filter 2, and the road port c that closes of fiber coupler is connected in series through outside line optical fiber 5 and two fiber-optic grating sensors 6 with different centre wavelengths at least; Broad band laser light source, tunable optical fiber filter, photo-detector module are electrically connected through bus 10 and spectroscopy unit 7 and control and data processing unit 8, and control and data processing unit also are electrically connected with display unit and/or communication unit 9.

Wherein, described fiber-optic grating sensor is the fiber-optic grating sensor with different grating pitches; Described display unit is a liquid crystal display circuit; Described photo-detector module is PIN type or APD type photodiode circuit

The wavelength of broad band laser light source cover the whole C wave band (1525~1565nm), have the 3dB wavelength coverage of 40nm, wide spectral range can be connected in series more optical fiber grating sensor (look the measured point temperature range and different) on simple optical fiber.

The tunable optical fiber filter is to utilize acousto-optic or electrooptical effect to change the refractive index of medium, thereby realizes the optical filter to the optical wavelength selection.

The catoptrical centre wavelength of fiber-optic grating sensor (also being peak wavelength) changes along with the change of temperature, when temperature raise/or when reducing, the peak wavelength of fiber-optic grating sensor is elongated or shorten.The peak wavelength of per 1 ℃ of temperature variation correspondence moves and is 10pm, fiber-optic grating sensor reflectivity>90%.

The length difference of the grating pitch of each fiber-optic grating sensor, then its catoptrical centre wavelength difference.By the catoptrical centre wavelength of each fiber-optic grating sensor is carried out corresponding coding with its address, then can easily judge the fiber-optic grating sensor that temperature changes, and then learn the high-tension apparatus that operation exception takes place.

Display unit is a liquid crystal display circuit; Described photo-detector module is PIN type or APD type photodiode circuit.

Among Fig. 2, control and data processing unit comprise zero passage detection, amplification, mould/number conversion, sampling and microcontroller circuit at least, its photo-detector module photodiode converts the light signal that receives to the analog quantity electric signal, amplifying circuit amplifies this signal, convert thereof into digital signal by mould/number conversion circuit, again through the sample circuit integer, remove clutter and undesired signal, send into spectroscopy unit at last and carry out signal analysis.

Above-mentioned signal processing all carries out under the control of microprocessor (CPU/MPU).

Among Fig. 3, described fiber coupler 3 comprises three fiber coupler 3-1,3-2 and 3-3 at least; Wherein,

The branch road port a of the first fiber coupler 3-1 is connected with broad band laser light source 1 light, " light is connected the branch road port a of its another minute road port b and the 3rd fiber coupler 3-3, and the road port c that closes of first fiber coupler is connected with the branch road port a ' light of the second fiber coupler 3-2.

Another minute road port b ' process tunable optical fiber filter 2 of second fiber coupler is connected with the input port light of photo-detector module 4, and it closes road port c ' through outside line optical fiber 5 and at least two fiber-optic grating sensor 6 serial connections with different centre wavelengths.

Equally, another minute road port b of the 3rd fiber coupler 3-3 " be connected with the input port light of photo-detector module 4 through tunable optical fiber filter 2, it closes road port c " is through outside line optical fiber and at least two fiber-optic grating sensor serial connections with different centre wavelengths.

All the other are with Fig. 1 or Fig. 2.

According to user's needs, more multichannel fiber coupler can also be set as stated above, to drive more the outside line optical fiber and the fiber-optic grating sensor of multichannel number (or being called passage).

The summary of the utility model course of work:

Microprocessor control broad band laser light source sends broad band laser, and this Shu Jiguang sends outside line optical fiber to by fiber coupler, is sent to the fiber-optic grating sensor of each serial connection by outside line optical fiber.Each fiber-optic grating sensor can reflect the laser of its centre wavelength, reflector laser is through outside line optical fiber, fiber coupler is sent to the tunable optical fiber filter, by it under the control of microprocessor, select the laser of certain wavelength (identical) to send into the photo-detector module with fiber-optic grating sensor centre wavelength, the photo-detector module converts light signal to electric signal, survey through electric signal being carried out zero passage again, amplify, analog to digital conversion, sampling, microprocessor control spectroscopy unit is handled sampled data, parse the temperature value of each monitoring point, the temperature rise that the amplitude of the variation of the centre wavelength by analyzing each fiber grating reflected light obtains the measured point changes.And can know the address of measured point, and the address of measured point and the temperature or the temperature rise situation of change of measured point are shown according to its centre wavelength.

Because the centre wavelength scope difference of the reflected light signal that a plurality of sensor returned is measured simultaneously so these sensor serial connection networkings can be realized multiple spot.

Because the utility model has adopted the fiber-optic grating sensor with different grating parameters, has reached the running temperature that detects a plurality of power equipment cable splices place simultaneously, can also differentiate specifically is the goal of the invention of which tested measuring point generation overheating.Owing to adopt fiber-optic grating sensor to carry out the temperature detection of high voltage electric power equip ment joint, can directly touch and desire measuring tape electricity object surfaces and directly detect its temperature value, both satisfy requirements such as the continuous online direct temperature measurement of high voltage electric power equip ment connector temperature detection system, reliability height, anti-interference, corrosion-resistant, explosion-proof ability be strong, guaranteed the electrical insulation capability of high-pressure system and temperature detection/display system again.

The utility model can be widely used in the field of the operation conditions detection of various high voltage electric power equip ments.

Claims (8)

1. a distributed optical fiber grating temperature detection system comprises broad band laser light source, tunable optical fiber filter, fiber coupler, outside line optical fiber, fiber-optic grating sensor, photo-detector module, it is characterized in that:
Also be provided with spectroscopy unit and control and data processing unit; Wherein,
Described broad band laser light source is connected with a branch road port light of at least one fiber coupler;
Another of fiber coupler minute road port is connected with the input port light of photo-detector module through the tunable optical fiber filter;
The road port that closes of fiber coupler is connected in series through outside line optical fiber and two fiber-optic grating sensors with different centre wavelengths at least;
Described broad band laser light source, tunable optical fiber filter, photo-detector module are electrically connected through bus and spectroscopy unit and control and data processing unit.
2. according to the described distributed optical fiber grating temperature detection system of claim 1, it is characterized in that described fiber-optic grating sensor is the fiber-optic grating sensor with different grating pitches.
3. according to the described distributed optical fiber grating temperature detection system of claim 1, it is characterized in that described control and data processing unit also are electrically connected with display unit and/or communication unit.
4. according to the described distributed optical fiber grating temperature detection system of claim 3, it is characterized in that described display unit is a liquid crystal display circuit.
5. according to the described distributed optical fiber grating temperature detection system of claim 1, it is characterized in that described broad band laser light source is the broad band laser light source that optical source wavelength covers the whole C wave band.
6. according to the described distributed optical fiber grating temperature detection system of claim 1, it is characterized in that described broad band laser light source has the 3dB wavelength coverage of 40nm.
7. according to the described distributed optical fiber grating temperature detection system of claim 1, it is characterized in that described photo-detector module is PIN type or APD type photodiode circuit.
8. according to the described distributed optical fiber grating temperature detection system of claim 1, it is characterized in that described control and data processing unit include zero passage detection, amplification, mould/number conversion, sampling and microcontroller circuit at least.
CN 200420098662 2004-12-10 2004-12-10 Distributed optical fibre raster temperature detecting system CN2760526Y (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100417962C (en) * 2006-09-04 2008-09-10 天津爱天光电子科技有限公司 Linear responsive optical fiber, optical grating temperature test system capable of collecting and demodulating signal
CN101949744A (en) * 2010-09-06 2011-01-19 国网电力科学研究院武汉南瑞有限责任公司 Fiber grating-based transformer internal temperature detection system
CN101975625A (en) * 2010-09-27 2011-02-16 苏州光格设备有限公司 Distributed optical fiber temperature sensing system and measurement method thereof
CN102062649A (en) * 2010-11-26 2011-05-18 中国计量学院 Dual wavelength light source self-correcting distributed optical fiber Raman temperature sensor for optical fiber Raman frequency shifter
CN102322888A (en) * 2011-08-30 2012-01-18 杭州布里特威光电技术有限公司 High-precision optical fiber grating sensing detection structure based on radio frequency optical modulation
CN102353524A (en) * 2011-06-27 2012-02-15 北京理工大学 Method and apparatus for testing dynamic spectrum of semiconductor laser
CN104236752A (en) * 2014-09-17 2014-12-24 国家电网公司 Oil-immersed transformer temperature measuring system
CN102322888B (en) * 2011-08-30 2016-12-14 武汉康特圣思光电技术有限公司 A kind of high precision optical fiber grating sensing detection structure based on radio frequency optical modulation
CN108680200A (en) * 2018-05-15 2018-10-19 山东省科学院激光研究所 environmental monitoring system, method and device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100417962C (en) * 2006-09-04 2008-09-10 天津爱天光电子科技有限公司 Linear responsive optical fiber, optical grating temperature test system capable of collecting and demodulating signal
CN101949744A (en) * 2010-09-06 2011-01-19 国网电力科学研究院武汉南瑞有限责任公司 Fiber grating-based transformer internal temperature detection system
CN101949744B (en) * 2010-09-06 2012-08-08 国网电力科学研究院武汉南瑞有限责任公司 Fiber grating-based transformer internal temperature detection system
CN101975625A (en) * 2010-09-27 2011-02-16 苏州光格设备有限公司 Distributed optical fiber temperature sensing system and measurement method thereof
CN101975625B (en) * 2010-09-27 2012-02-29 苏州光格设备有限公司 Distributed optical fiber temperature sensing system and measurement method thereof
CN102062649A (en) * 2010-11-26 2011-05-18 中国计量学院 Dual wavelength light source self-correcting distributed optical fiber Raman temperature sensor for optical fiber Raman frequency shifter
CN102062649B (en) * 2010-11-26 2012-11-21 中国计量学院 Dual wavelength light source self-correcting distributed optical fiber Raman temperature sensor for optical fiber Raman frequency shifter
CN102353524A (en) * 2011-06-27 2012-02-15 北京理工大学 Method and apparatus for testing dynamic spectrum of semiconductor laser
CN102353524B (en) * 2011-06-27 2014-04-16 北京理工大学 Method and apparatus for testing dynamic spectrum of semiconductor laser
CN102322888A (en) * 2011-08-30 2012-01-18 杭州布里特威光电技术有限公司 High-precision optical fiber grating sensing detection structure based on radio frequency optical modulation
CN102322888B (en) * 2011-08-30 2016-12-14 武汉康特圣思光电技术有限公司 A kind of high precision optical fiber grating sensing detection structure based on radio frequency optical modulation
CN104236752A (en) * 2014-09-17 2014-12-24 国家电网公司 Oil-immersed transformer temperature measuring system
CN108680200A (en) * 2018-05-15 2018-10-19 山东省科学院激光研究所 environmental monitoring system, method and device

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