CN2896250Y - Distribution-type optical-fiber temperature sensor - Google Patents

Distribution-type optical-fiber temperature sensor Download PDF

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Publication number
CN2896250Y
CN2896250Y CN 200620034197 CN200620034197U CN2896250Y CN 2896250 Y CN2896250 Y CN 2896250Y CN 200620034197 CN200620034197 CN 200620034197 CN 200620034197 U CN200620034197 U CN 200620034197U CN 2896250 Y CN2896250 Y CN 2896250Y
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CN
China
Prior art keywords
light
light source
temperature sensor
sensor
pump light
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CN 200620034197
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Chinese (zh)
Inventor
刘永智
代志勇
彭增寿
欧中华
张利勋
胡浩
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四川莱威科技有限公司
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Priority to CN 200620034197 priority Critical patent/CN2896250Y/en
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Publication of CN2896250Y publication Critical patent/CN2896250Y/en

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Abstract

The utility model discloses a distributed light fiber temperature sensor, which comprises a pulse laser source 1, a sensing light fiber, a light detector 4 and 5 and a signal treatment unit 6, wherein the pulse laser is infused by the sensing light fiber by the light source 1, the anti-Stokes backscattering light 2 and Rayleigh scattering light 3 generated along the light fiber transmission light respectively reach the light detector 4 and 5 after the beam splitting and filtration and then enter the signal treatment unit 6 after converting into the electric signal. The sensor is characterized in that the light fiber temperature sensor is also provided with a continuous Pump light source. The technology of the utility model will effectively improve performance of the sensor, the temperature resolution can reach 0.01 degree and the measuring distance can reach 40km. Compared to the sensor with the same or higher performance, the cost is reduced by 1/3 and no technical complexity and maintenance difficulty will be incurred. Such sensor is able to overcome defects in the conventional high-performance distributing temperature sensor, namely high cost, complicated system, low stability and large amount of maintenance expense.

Description

A kind of distributed optical fiber temperature sensor

Technical field

The utility model relates to the photoelectron technology field, is specifically related to a kind of Raman scattering principle of utilizing and combines with optical time domain reflection technology along the technology of optical fiber progress row ambient temperature measurement, i.e. distributed optical fiber temperature sensor technology.

Background technology

Most of distributed light temperature sensors all are utilization scattering of light principles in the prior art, adopt sensitive element and the information transmission medium of optical fiber as temperature, realize long apart from continuous space temperature field distribution measuring, being fit to networking detects, as Rayleigh (Rayleigh) scattering, Raman (Raman) scattering and Stokes (Stokes) scattering etc., they all are the distributions of measuring temperature by the scattered light in the optical fiber, wherein the districution temperature sensing technology based on Raman scattering is the most ripe in a distributing optical fiber sensing technology technology, existing procucts appear on the market in the market, typically representing present international highest level just like the DTS main frame of Sentinel company, temperature resolution can reach 0.01 ℃, and the measuring distance of its DTS-XR has reached 30km.

For the existing a lot of both at home and abroad articles reports of distributed light temperature sensor, representative as:

1, Liu Honglin etc.; The space distribution rate research of 30Km profile fiber temperature sensor; Chinese journal of scientific instrument 26 (11) 2005.11;

2、Zang?zaixuan?and?al;Optical?Fiber?Raman?Amplifier?and?DistributedFiber?Raman?Sensors;Proceeding?of?SPIE?Vol.5129(2003)

Principle of work and the realization approach and the condition of work of sensor described from different perspectives in article, and temperature survey sensitivity and the influence factor of having analyzed sensor are discussed, and spatial resolution is measured dynamic range etc., and introduced the related experiment result.

At present, conventional distributed light temperature sensor principle of work is as follows, inject sensor fibre by high-power laser by light source, promptly Raman light and Rayleigh scattering light arrive the corresponding light detector respectively after filtering along the reverse anti Stokes scattering light that has temperature information that Optical Fiber Transmission produced, two-way light enters signal processing unit respectively and both are compared with coherent signal handles after photo-detector is converted to electric signal, obtain at last along the temperature signal of optical fiber each point, comprise a little distance and temperature value.Obtain angle from light signal and consider that for obtaining high temperature resolution, under same measurement temperature, the amplitude of a Raman light heals height better.For this reason, common way is to increase the input pulse luminous power.On the other hand, Reyleith scanttering light accounts for the overwhelming majority in the rear orientation light, for obtaining temperature information, must adopt the high-isolation optical filter respectively anti Stokes scattering light and stokes scattering light to be separated from Rayleigh scattering.High-performance distributed optical fiber sensing device for above-mentioned routine, in order to obtain high temperature resolution (more than 0.1 degree) and big measuring distance (more than 20 kilometers), the high entrant laser power (incident optical power is more than tens watts) and the wavelength filter of high-isolation often need be provided, just can improve signal amplitude to greatest extent and improve Raman/Reyleith scanttering light signal to noise ratio (S/N ratio).This has just proposed very high request to light source and wave filter, thereby has improved the technical difficulty and the cost of system.Because technical complexity and cost improve, this has just influenced the stability and the daily servicing with product promoted the use of of product to a great extent.

The utility model content

The technical problems to be solved in the utility model is how a kind of distributed temperature sensor is provided, and this sensor can overcome the high-performance distributed temperature sensor cost of above-mentioned routine height, deficiency such as system complex, poor stability, maintenance cost are big.

Above-mentioned technical matters of the present utility model is to solve like this: a kind of distributed optical fiber temperature sensor is provided, comprise pulsed laser light source 1, sensor fibre, photo-detector 4 and 5 and signal processing unit 6, its pulse laser injects sensor fibre by described light source 1, afterwards along light transmission fiber produced after beam splitting and filtering, arrive described photo-detector 4 and 5 respectively to anti Stokes scattering light 2 and Rayleigh scattering light 3, enter described signal processing unit 6 after being converted to electric signal, it is characterized in that described fibre optic temperature sensor also is provided with continuous pump light source.

According to distributed optical fiber temperature sensor provided by the utility model, it is characterized in that described continuous pump light source is a backward pump light source 7.

According to distributed optical fiber temperature sensor provided by the utility model, it is characterized in that described continuous pump light source is a forward direction pump light source 8.

According to distributed optical fiber temperature sensor provided by the utility model, it is characterized in that described continuous pump light source can be provided with pump light source and forward direction pump light source simultaneously.

According to distributed optical fiber temperature sensor provided by the utility model, it is characterized in that described continuous pump light source wavelength can be 1300nm-1400nm.

According to distributed optical fiber temperature sensor provided by the utility model, it is characterized in that described continuous pump light source power can be 0.1 watt-2 watts.

Distributed optical fiber temperature sensor provided by the utility model mainly increases by continuous pump light source (forward direction pumping) or (backward pump) that amplifies at anti Stokes scattering light (Raman light) specially on the conventional sensors basis, utilizing this Raman to amplify can amplify not needing to improve greatly a Raman light (anti Stokes scattering light) that will have temperature information under the situation of input pulse luminous power, promptly mainly be that to have increased the one-level distributed raman amplifier on conventional temp measuring system be continuous pump light source, the Raman signal (Raman light) of the sign temperature obtained by conventional light source and wave filter is amplified.Because selected amplification wavelength is exactly a Raman light wavelength, thereby has improved Raman/Reyleith scanttering light signal to noise ratio (S/N ratio) automatically; And used pump light source need not to remotivate Raman scattering, thereby can adopt the continuously-running duty of low threshold value.Pump light can be from injecting forward or backwards, and efficient is higher in the same way with a Raman light that receives because backlight injects, and it will more help remedying the decline of incident light.Thereby temperature resolution and measuring distance are greatly improved.Be used for the optical wavelength that Raman strengthen to amplify and select (utilizing the Stokes light amplification) in 1300nm~1400nm scope, power can be selected in 0.1-2 watt of scope, concrete visible system and deciding.The Raman that produces under selected wavelength amplifies the amplitude that can improve a Raman amplification light in the distributed optical fiber temperature sensor, thereby the signal to noise ratio (S/N ratio) that improves sensor is improved temperature survey resolution and improved the measuring distance scope.To sum up state, this utility model technology will effectively improve the performance of sensor, and temperature resolution can reach 0.01 degree, measuring distance can reach 40 kilometers, and with respect to high-performance sensors equally or more, its cost will descend 1/3, can not bring technical complexity and maintenance difficulties, and performance is more excellent.

Description of drawings

Fig. 1 is conventional high-performance distributed optical fiber sensing device fundamental diagram.

Fig. 2 is the fundamental diagram of the distributed optical fiber temperature sensor that provides of the utility model.

Fig. 3 is the circuit diagram of the distributed optical fiber temperature sensor that provides of the utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is elaborated.

Conventional high-performance distributed optical fiber sensing device principle of work as shown in Figure 1,1 is the high power pulsed laser light source, 2 for to have the back to anti Stokes scattering light of temperature information, 3 is Rayleigh scattering light, 4 and 5 is photo-detector, 6 is signal processing unit.High power pulsed laser injects sensor fibre by light source, have a temperature information along light transmission fiber produced back promptly Raman light and Rayleigh scattering light 3 arrive photo-detector 4 and 5 respectively after filtering to anti Stokes scattering light 2, two-way light enters signal processing unit 6 respectively and both are compared with coherent signal handles after photo-detector is converted to electric signal, obtain at last along the temperature signal of optical fiber each point, comprise a little distance and temperature value.Obtain angle from light signal and consider that for obtaining high temperature resolution, in same measurement temperature, and under unsaturated state, the amplitude of a Raman light (anti Stokes scattering light) heals height better, for this reason, common way is to increase the input pulse luminous power.On the other hand, Reyleith scanttering light accounts for the overwhelming majority in the rear orientation light, for obtaining temperature information, must adopt the high-isolation optical filter respectively anti Stokes scattering light (Raman light) and stokes scattering light to be separated from Rayleigh scattering.The isolation of wave filter also will have influence on temperature survey resolution.Because system adopts optical time domain reflection (OTDR) technology to determine the point for measuring temperature position, the raising of input optical power also will increase measuring distance.

Shown in distributed optical fiber temperature sensor principle of work Fig. 2 provided by the utility model, 1 is the high power pulsed laser light source, 2 for having the back to anti Stokes scattering light of temperature information, 3 is Rayleigh scattering light, 4 and 5 is photo-detector, 6 is signal processing unit, and 7 is the forward direction pump light source, and 8 is the backward pump light source.Be to increase by a continuous pump light source 7 (forward direction pumping) or 8 (backward pumps) that amplify at anti Stokes scattering light (Raman light) specially on the basis being provided with of the high-performance distributed temperature sensor of routine, utilizing this Raman to amplify can amplify 5-15dB not needing to improve greatly a Raman light (anti Stokes scattering light) that will have temperature information under the situation of input pulse luminous power, thereby temperature resolution and measuring distance are greatly improved.Under near the pulsed light 1550nm wavelength injected, a Raman light wavelength that is produced was about 1450nm.Be used for Raman and strengthen the optical wavelength of amplification in 1300nm~1400nm scope selection (utilizing the Stokes light amplification).The Raman that produces under selected wavelength amplifies the amplitude that can improve a Raman amplification light in the distributed optical fiber temperature sensor, thereby the signal to noise ratio (S/N ratio) that improves sensor is improved temperature survey resolution and improved the measuring distance scope.

As specific embodiment, if select the incident pulse optical wavelength near 1550nm, as 1545nm, a Raman light (anti Stokes scattering light) wavelength that has temperature information that is produced is 1446nm, the newly-increased pump light wavelength that is used for the Raman enhancing is chosen as 1320nm according to the Raman amplification characteristic, 1 watt of power, and a Raman light that has temperature information this moment can obtain the gain of about 10dB, and temperature signal resolution can improve nearly 8 times, and measuring distance reaches 40 kilometers.When the injected pulse optical wavelength near 1550nm during other wavelength, Raman strengthens with newly-increased pump light wavelength to be chosen according to the Raman amplification characteristic of the optical fiber that is adopted in 1300nm~1400nm scope, and its watt level requires (temperature resolution, distance sensing) and decides at 0.1 watt of-2 watts of endoscope system.

Claims (6)

1, a kind of distributed optical fiber temperature sensor, comprise pulsed laser light source (1), sensor fibre, photo-detector (4) and (5) and signal processing unit (6), its pulse laser injects sensor fibre by described light source (1), afterwards along light transmission fiber produced after beam splitting and filtering, arrive described photo-detector (4) and (5) respectively to anti Stokes scattering light (2) and Rayleigh scattering light (3), enter described signal processing unit (6) after being converted to electric signal, it is characterized in that described fibre optic temperature sensor also is provided with continuous pump light source.
2, distributed optical fiber temperature sensor according to claim 1 is characterized in that, described continuous pump light source is backward pump light source (7).
3, distributed optical fiber temperature sensor according to claim 1 is characterized in that, described continuous pump light source is forward direction pump light source (8).
4, distributed optical fiber temperature sensor according to claim 1 is characterized in that, described continuous pump light source can be provided with backward pump light source and forward direction pump light source simultaneously.
According to the arbitrary described distributed optical fiber temperature sensor of claim 1-4, it is characterized in that 5, described continuous pump light source wavelength can be 1300nm-1400nm.
According to the arbitrary described distributed optical fiber temperature sensor of claim 1-4, it is characterized in that 6, described continuous pump light source power can be 0.1 watt--2 watts.
CN 200620034197 2006-05-15 2006-05-15 Distribution-type optical-fiber temperature sensor CN2896250Y (en)

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100490737C (en) * 2007-07-20 2009-05-27 华中科技大学 Device and method for detecting depth of anesthesia
CN101813530A (en) * 2010-03-26 2010-08-25 中国计量学院 Distributed optical fiber Raman temperature sensor embedded with optical switch
CN101639388B (en) * 2009-09-03 2011-01-05 中国计量学院 Raman related double-wavelength light source self-correction distributed optical fiber Raman temperature sensor
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
CN102080954A (en) * 2010-11-26 2011-06-01 中国计量学院 Ultra-long range 100km decentralized optical fiber Rayleigh and Raman scattering sensor
CN101743460B (en) * 2007-07-18 2011-10-19 萨索特兰公司 Dual source auto-correction in distributed temperature systems
CN101344440B (en) * 2008-08-28 2012-03-21 上海华魏自动化设备有限公司 Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and its use method
CN101696896B (en) * 2009-08-05 2012-07-04 上海华魏光纤传感技术有限公司 Photoelectric device of distributed optical fiber temperature sensing system
CN102881107A (en) * 2012-09-26 2013-01-16 金海新源电气江苏有限公司 Alarm threshold value adaptive method for distributed optical fiber temperature sensor
CN103267591A (en) * 2013-05-24 2013-08-28 武汉新烽光电科技有限公司 Tree-type optical fiber temperature sensor system and using method thereof
CN103913186A (en) * 2014-04-25 2014-07-09 重庆大学 Multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering
CN104344913A (en) * 2014-10-09 2015-02-11 国家电网公司 Temperature measurement system and method based on fiber grating sensing
CN104764540A (en) * 2015-01-15 2015-07-08 合肥工业大学 Raman fiber temperature measurement system combined with raman amplification technology
CN106323498A (en) * 2015-07-03 2017-01-11 中国电力科学研究院 Distributed optical fiber temperature sensor
CN106353003A (en) * 2016-08-10 2017-01-25 深圳艾瑞斯通技术有限公司 Distributed optical fiber temperature measuring method and system

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101743460B (en) * 2007-07-18 2011-10-19 萨索特兰公司 Dual source auto-correction in distributed temperature systems
CN100490737C (en) * 2007-07-20 2009-05-27 华中科技大学 Device and method for detecting depth of anesthesia
CN101344440B (en) * 2008-08-28 2012-03-21 上海华魏自动化设备有限公司 Automatic temperature calibration type distributed optical fiber temperature measurement sensing equipment and its use method
CN101696896B (en) * 2009-08-05 2012-07-04 上海华魏光纤传感技术有限公司 Photoelectric device of distributed optical fiber temperature sensing system
CN101639388B (en) * 2009-09-03 2011-01-05 中国计量学院 Raman related double-wavelength light source self-correction distributed optical fiber Raman temperature sensor
CN101813530A (en) * 2010-03-26 2010-08-25 中国计量学院 Distributed optical fiber Raman temperature sensor embedded with optical switch
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
CN102080954A (en) * 2010-11-26 2011-06-01 中国计量学院 Ultra-long range 100km decentralized optical fiber Rayleigh and Raman scattering sensor
CN102080954B (en) * 2010-11-26 2012-11-07 中国计量学院 Ultra-long range 100km decentralized optical fiber Rayleigh and Raman scattering sensor
CN102881107A (en) * 2012-09-26 2013-01-16 金海新源电气江苏有限公司 Alarm threshold value adaptive method for distributed optical fiber temperature sensor
CN103267591A (en) * 2013-05-24 2013-08-28 武汉新烽光电科技有限公司 Tree-type optical fiber temperature sensor system and using method thereof
CN103267591B (en) * 2013-05-24 2014-12-10 武汉新烽光电科技有限公司 Tree-type optical fiber temperature sensor system and using method thereof
CN103913186A (en) * 2014-04-25 2014-07-09 重庆大学 Multiparameter distributed type optical fiber sensing system based on Rayleigh scattering and Raman scattering
CN104344913A (en) * 2014-10-09 2015-02-11 国家电网公司 Temperature measurement system and method based on fiber grating sensing
CN104764540A (en) * 2015-01-15 2015-07-08 合肥工业大学 Raman fiber temperature measurement system combined with raman amplification technology
CN106323498A (en) * 2015-07-03 2017-01-11 中国电力科学研究院 Distributed optical fiber temperature sensor
CN106353003A (en) * 2016-08-10 2017-01-25 深圳艾瑞斯通技术有限公司 Distributed optical fiber temperature measuring method and system
CN106353003B (en) * 2016-08-10 2019-03-01 深圳艾瑞斯通技术有限公司 A kind of distributed optical fiber temperature measuring method and system

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