CN101603866B - Distributed optical fiber stress temperature sensing device and sensing method thereof - Google Patents
Distributed optical fiber stress temperature sensing device and sensing method thereof Download PDFInfo
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- CN101603866B CN101603866B CN2009100549662A CN200910054966A CN101603866B CN 101603866 B CN101603866 B CN 101603866B CN 2009100549662 A CN2009100549662 A CN 2009100549662A CN 200910054966 A CN200910054966 A CN 200910054966A CN 101603866 B CN101603866 B CN 101603866B
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Abstract
The invention discloses a distributed optical fiber stress temperature sensing device and a sensing method. The sensing device comprises a light source, a pulse modulator, a circulator, a coupler, a Raman light filter, a Brillouin light filter, a Raman light detector, a Brillouin light detector, a first amplifier, a second amplifier, a data collector, a data processor and a computer. Specific light penetrates the Raman light filter and the Brillouin light filter respectively; the data processor calculates stress information and temperature information respectively according to the information of the specific light. The distributed optical fiber stress temperature sensing device can measure temperature and stress simultaneously while guaranteeing the measuring performance, and can eliminate the influence of the temperature when the stress is measured, thus improving precise of stress measurement.
Description
Technical field
The present invention relates to a kind of distribution type optical fiber sensing equipment, relate in particular to a kind of distribution type optical fiber sensing equipment with energy while thermometric degree and stress; In addition, the invention still further relates to the method for sensing of above-mentioned sensing device.
Background technology
Distributed optical fiber sensing system is mainly used in industries such as traffic, building, electric power, colliery, petrochemical industry, and its effect is various parameters of measuring these important places in real time.It ensures that to normally moving with guaranteeing industrial system equipment the safety of life and property plays an important role.
The existing distributed fibre-optical sensing device by laser driver, laser instrument,, coupling mechanism, light filter, detector, signal amplifier, data acquisition unit, data processor and computing machine form.Its principle of work is: laser instrument is continuously launched laser in detecting optical cable, back scattering can take place in the transmission course in laser in optical cable, because the loudspeaker diffuse spectrum is responsive to temperature, then a certain spectral separation in the rear orientation light is come out by coupling mechanism and light filter, pass through the laggard line data collection of opto-electronic conversion and signal processing and amplifying again, and then the data that collect are sent to the data processor computing machine handle calculating, finally draw needed data.
The total hope of people can be measured a plurality of parameters simultaneously in actual applications.And temperature and stress are more crucial two parameters in numerous parameters in the practical application.But the existing distributed fibre-optical sensing device can only be measured single parameter; Can only measure temperature, or can only measure stress, can't measure two parameters simultaneously.
The defective that the existing distributed fibre-optical sensing device exists and not enough as follows:
(1) existing fibre-optical sensing device can only be surveyed single parameter, can't measure a plurality of parameters simultaneously;
(2) device of measurement stress can be subjected to Temperature Influence, and precision is lower;
(3) adopt computer processing data, processing speed is slow, influences detection response speed.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of distributed optical fiber stress temperature sensing device, simultaneously thermometric degree and stress.
In addition, the present invention also provides the method for sensing of above-mentioned sensing device.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of distributed optical fiber stress temperature sensing device is characterized in that, this sensing device comprises:
Light source is in order to send continuous light;
Pulse-modulator becomes needed pulsed light wave in order to the Laser Modulation of light source being sent according to the design pulse parameter;
Circulator branches away fully in order to the laser that back scattering is returned, and exports to a coupling mechanism;
Coupling mechanism is divided into two-way in order to the laser that back scattering is returned and passes to two different light filters respectively: Raman light light filter, Brillouin light light filter;
The Raman light light filter in order to filter other light except that Raman light, has only Raman's luminous energy to see through;
The Brillouin light light filter in order to filter other light except that Brillouin light, has only Brillouin's luminous energy to see through;
Raman light detector, Brillouin light detector are connected with described Raman light light filter, Brillouin light light filter respectively, in order to the light signal switching electrical signals that will receive;
First amplifier, second amplifier are connected with Raman light detector, Brillouin light detector respectively, in order to above-said current signal is amplified;
Data acquisition unit is in order to gather the electric signal that amplifies through described first amplifier, second amplifier;
Data processor, the data in order to the processing said data collector is gathered draw temperature data, stress data.
As a preferred embodiment of the present invention, described data processor also comprises the stress data amending unit, revises in order to serviceability temperature data counter stress data.
As a preferred embodiment of the present invention, described sensing device also comprises computing machine, is connected with data processor by data communication interface, in order to reading temperature data, the stress data that described data processor obtains, and is shown.
As a preferred embodiment of the present invention, described light source comprises laser driver and the laser instrument that is connected; Laser driver sends laser in order to drive laser.
As a preferred embodiment of the present invention, described laser driver is the current driver that adopts high speed circuit to make; Described laser instrument is a semiconductor laser, can launch laser according to the drive current of Laser Driven.
As a preferred embodiment of the present invention, described coupling mechanism adopts the y-type optical fiber coupling mechanism.
As a preferred embodiment of the present invention, described Raman light detector, Brillouin light detector adopt high sensitivity APD avalanche diode to come exploring laser light, with the light signal switching electrical signals.
A kind of method for sensing of above-mentioned distributed optical fiber stress temperature sensing device is characterized in that, this method comprises the steps:
By circulator rear orientation light is separated from sensor fibre and to transmit;
Rear orientation light by coupling mechanism with after be divided into two parts and pass to Raman light light filter and Brillouin light light filter respectively;
Other light of Raman light light filter elimination only sees through Raman light, Raman light is transferred to the Raman light detector again; Other light of Brillouin light light filter elimination only sees through Brillouin light, Brillouin light is transferred to the Brillouin light detector again;
Raman light detector and Brillouin light detector convert two ways of optical signals to electric signal, are transferred to first amplifier respectively again and second amplifier carries out processing and amplifying, but signal are amplified to the degree of acquisition process;
The signal that the two-way amplifier amplified is transferred to data acquisition unit, carries out data acquisition and accumulation process; The intact data of data acquisition unit collection are transferred to data processor again and calculate, and draw temperature data, stress data; Wherein, obtain temperature data, obtain stress data by the information of analyzing Brillouin light by the information of analyzing Raman light.
As a preferred embodiment of the present invention, described method comprises the steps: that also serviceability temperature data counter stress data revise.
As a preferred embodiment of the present invention, described method also comprises the steps: temperature data, the stress data that described computing machine reading of data processor obtains, and is shown.
Beneficial effect of the present invention is: the distributed optical fiber stress temperature sensing device that the present invention proposes, when guaranteeing measurement performance, can measure temperature and stress simultaneously; And can eliminate stress is subjected to Temperature Influence when measuring, thereby improves the stress measurement precision.This device also adopts special-purpose data processing dsp chip to do data processing, thereby has improved the response speed of device.
Description of drawings
Fig. 1 is the composition synoptic diagram of distribution type fiber-optic temperature stress sensing device of the present invention.
Embodiment
Describe the preferred embodiments of the present invention in detail below in conjunction with accompanying drawing.
See also figure one, the present invention has disclosed a kind of distributed optical fiber stress temperature sensing device, and this sensing device comprises light source 10, pulse-modulator 20, circulator 30, coupling mechanism 40, Raman light light filter 51, Brillouin light light filter 52, Raman light detector 61, Brillouin light detector 62, first amplifier 71, second amplifier 72, data acquisition unit 80, data processor 90, computing machine 100.
Pulse-modulator 20 becomes needed pulsed light wave in order to the Laser Modulation of laser instrument being sent according to the design pulse parameter.
Circulator 30 branches away fully in order to the laser that back scattering is returned, and exports to a coupling mechanism 40.Circulator injects pulsed light sensing optic cable 31 simultaneously, and in the present embodiment, described sensing optic cable 31 adopts single-mode fiber to add the low smoke and zero halogen oversheath.
Coupling mechanism 40 is divided into two-way in order to the laser that back scattering is returned and passes to two different light filters respectively: Raman light light filter 51, Brillouin light light filter 52.In the present embodiment, described coupling mechanism 40 adopts the y-type optical fiber coupling mechanism.
Raman light light filter 51, Brillouin light light filter 52 adopt specific optical filter to filter, and unnecessary light is filtered, and only stay needed light.Wherein, Raman light light filter 51 has only Raman's luminous energy to see through in order to filter other light except that Raman light, has comprised temperature information in the Raman light; Brillouin light light filter 52 has only Brillouin's luminous energy to see through in order to filter other light except that Brillouin light, has comprised stress information in the Brillouin light.
Raman light detector 61, Brillouin light detector 62 are connected with described Raman light light filter 51, Brillouin light light filter 52 respectively, in order to the light signal switching electrical signals that will receive.In the present embodiment, described Raman light detector 61, Brillouin light detector 62 adopt high sensitivity APD avalanche diode to come exploring laser light, with the light signal switching electrical signals.
First amplifier 71, second amplifier 72 are connected with Raman light detector 61, Brillouin light detector 62 respectively, in order to above-said current signal is amplified.First amplifier 71, second amplifier 72 are made up of a plurality of amplification chips, pass to data acquisition unit 80 after feeble signal is amplified.
Data acquisition unit 80 is in order to gather the electric signal that amplifies through described first amplifier 71, second amplifier 72.In the present embodiment, data acquisition unit 80 adopts the high-speed data acquisition chip, and travelling speed is 100Mb/s.
The data that data processor 90 is gathered in order to processing said data collector 80 draw temperature data, stress data; Obtain temperature data by the information of analyzing Raman light, obtain stress data by the information of analyzing Brillouin light.In the present embodiment, data processor 90 adopts the high-speed dsp process chip to realize.In addition, described data processor 90 also comprises the stress data amending unit, revises in order to serviceability temperature data counter stress data.
More than introduced distributed optical fiber stress temperature sensing device of the present invention, below introduced the method for sensing of above-mentioned sensing device, this method comprises the steps:
Steps A, laser driver 12 drive laser 11 are sent laser;
The Laser Modulation that step B, pulse-modulator 20 send laser instrument 11 according to the design pulse parameter becomes needed pulsed light wave;
Step C, by circulator rear orientation light is separated from sensor fibre and to transmit; Rear orientation light by coupling mechanism with after be divided into two parts and pass to Raman light light filter and Brillouin light light filter respectively;
Other light of step D, the elimination of Raman light light filter only sees through Raman light, Raman light is transferred to the Raman light detector again; Other light of Brillouin light light filter elimination only sees through Brillouin light, Brillouin light is transferred to the Brillouin light detector again;
Step e, Raman light detector and Brillouin light detector convert two ways of optical signals to electric signal, are transferred to first amplifier respectively again and second amplifier carries out processing and amplifying, but signal are amplified to the degree of acquisition process;
The signal that step F, two-way amplifier amplified is transferred to data acquisition unit, carries out data acquisition and accumulation process; The intact data of data acquisition unit collection are transferred to data processor again and calculate, and draw temperature data, stress data; Obtain temperature data by the information of analyzing Raman light, obtain stress data by the information of analyzing Brillouin light.Then, serviceability temperature data counter stress data are revised;
Temperature data, stress data that step G, described computing machine reading of data processor obtain, and shown.
In sum, the present invention is by being provided with Raman light light filter, Brillouin light light filter, and two filter only sees through specific light respectively; Data processor is according to information difference calculated stress information, the temperature information of above-mentioned specific light.The present invention compares with traditional distribution type optical fiber sensing equipment, and following advantage and good effect are arranged:
(1) the present invention can measure temperature and stress simultaneously;
(2) the present invention revises by the measurement of temperature counter stress;
(3) adopt high-speed dedicated data processor processes data, improved detection speed.
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 are 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 form, structure, layout, ratio, and realize with other assembly, 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 here to disclosed embodiment.
Claims (10)
1. a distributed optical fiber stress temperature sensing device is characterized in that, this sensing device comprises:
Light source is in order to send continuous light;
Pulse-modulator becomes needed pulsed light wave in order to the Laser Modulation of light source being sent according to the design pulse parameter;
Circulator branches away in order to the laser that back scattering is returned, and exports to a coupling mechanism;
Coupling mechanism is divided into two-way in order to the laser that back scattering is returned and passes to two different light filters respectively: Raman light light filter, Brillouin light light filter;
The Raman light light filter in order to filter other light except that Raman light, has only Raman's luminous energy to see through;
The Brillouin light light filter in order to filter other light except that Brillouin light, has only Brillouin's luminous energy to see through;
Raman light detector, Brillouin light detector are connected with described Raman light light filter, Brillouin light light filter respectively, in order to the light signal switching electrical signals that will receive;
First amplifier, second amplifier are connected with Raman light detector, Brillouin light detector respectively, in order to above-said current signal is amplified;
Data acquisition unit is in order to gather the electric signal that amplifies through described first amplifier, second amplifier;
Data processor, the data in order to the processing said data collector is gathered draw temperature data, stress data.
2. distributed optical fiber stress temperature sensing device according to claim 1 is characterized in that:
Described data processor also comprises the stress data amending unit, revises in order to serviceability temperature data counter stress data.
3. distributed optical fiber stress temperature sensing device according to claim 1 is characterized in that:
Described sensing device also comprises computing machine, is connected with data processor by data communication interface, in order to reading temperature data, the stress data that described data processor obtains, and is shown.
4. distributed optical fiber stress temperature sensing device according to claim 1 is characterized in that:
Described light source comprises laser driver and the laser instrument that is connected; Laser driver sends laser in order to drive laser.
5. distributed optical fiber stress temperature sensing device according to claim 4 is characterized in that:
Described laser driver is the current driver that adopts high speed circuit to make;
Described laser instrument is a semiconductor laser, can launch laser according to the drive current of Laser Driven.
6. according to the arbitrary described distributed optical fiber stress temperature sensing device of claim 1 to 5, it is characterized in that:
Described coupling mechanism adopts the y-type optical fiber coupling mechanism.
7. according to the arbitrary described distributed optical fiber stress temperature sensing device of claim 1 to 5, it is characterized in that:
Described Raman light detector, Brillouin light detector adopt high sensitivity APD avalanche diode to come exploring laser light, with the light signal switching electrical signals.
8. the method for sensing of the arbitrary described distributed optical fiber stress temperature sensing device of claim 1 to 7 is characterized in that, this method comprises the steps:
By circulator rear orientation light is separated from sensor fibre and to transmit;
Rear orientation light by coupling mechanism with after be divided into two parts and pass to Raman light light filter and Brillouin light light filter respectively;
Other light of Raman light light filter elimination only sees through Raman light, Raman light is transferred to the Raman light detector again; Other light of Brillouin light light filter elimination only sees through Brillouin light, Brillouin light is transferred to the Brillouin light detector again;
Raman light detector and Brillouin light detector convert two ways of optical signals to electric signal, are transferred to first amplifier respectively again and second amplifier carries out processing and amplifying, but signal are amplified to the degree of acquisition process;
The signal that the two-way amplifier amplified is transferred to data acquisition unit, carries out data acquisition and accumulation process; The intact data of data acquisition unit collection are transferred to data processor again and calculate, and draw temperature data, stress data; Wherein, obtain temperature data, obtain stress data by the information of analyzing Brillouin light by the information of analyzing Raman light.
9. method for sensing according to claim 8 is characterized in that:
Described method also comprises the steps:
Serviceability temperature data counter stress data are revised.
10. method for sensing according to claim 8 is characterized in that:
Described method also comprises the steps:
Temperature data, stress data that described computing machine reading of data processor obtains, and shown.
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Families Citing this family (15)
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| CN101787882B (en) * | 2010-02-11 | 2013-05-08 | 哈尔滨工业大学 | Optical time domain reflection (OTDR) distributed optical fiber sensing system based on Brillouin scattering and subsurface temperature monitoring method using same |
| CN101819073B (en) * | 2010-05-11 | 2011-08-17 | 中国计量学院 | Distributed optical fiber Raman temperature sensor coding and decoding by adopting sequential pulse |
| CN101900611B (en) * | 2010-07-14 | 2013-05-01 | 宁波诺驰光电科技发展有限公司 | Device and method for simultaneously measuring temperature and stress by using distributed optical fiber sensor |
| CN101929879B (en) * | 2010-08-02 | 2012-01-11 | 北京航空航天大学 | Optical fiber sensor for simultaneously sensing temperature and pressure |
| CN101975626B (en) * | 2010-10-13 | 2012-01-25 | 华中科技大学 | Brillouin scattering based distributive fiber sensing system |
| CN102226703B (en) * | 2011-03-29 | 2013-09-25 | 宁波诺驰光电科技发展有限公司 | Distributed fiber multi-parameter sensor and multi-parameter measuring method |
| CN102410998A (en) * | 2011-12-16 | 2012-04-11 | 湖南科技大学 | Laser light scattering (LLS)-Raman spectrum joint device |
| CN102564481A (en) * | 2012-01-11 | 2012-07-11 | 中国科学院上海光学精密机械研究所 | Method and device for improving signal-to-noise ratio of distributed optical fiber Brillouin sensor |
| CN103743421B (en) * | 2013-12-31 | 2016-05-18 | 上海华魏光纤传感技术有限公司 | Based on many method for sensing of single optical fibre |
| CN106153215A (en) * | 2016-07-21 | 2016-11-23 | 南京铁道职业技术学院 | A kind of system for detecting temperature in electric power facility |
| CN108020399A (en) * | 2016-10-31 | 2018-05-11 | 中国石油天然气集团公司 | A kind of difunctional optical path structure |
| CN107340077B (en) * | 2017-07-11 | 2023-06-02 | 中国地质大学（武汉） | Sensing method and sensing system for full-distributed optical fiber temperature and stress |
| JP6376261B1 (en) * | 2017-09-27 | 2018-08-22 | 沖電気工業株式会社 | Optical fiber strain and temperature measuring device and optical fiber strain and temperature measuring method |
| CN111089680A (en) * | 2019-12-09 | 2020-05-01 | 北京航天时代光电科技有限公司 | Portable fiber bragg grating pressure detection system and method |
| CN116046026B (en) * | 2023-03-31 | 2023-06-16 | 中国船舶集团有限公司第七〇七研究所 | Fiber-optic gyroscope performance measurement method and system based on stress factors |
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