CN102881107A - Alarm threshold value adaptive method for distributed optical fiber temperature sensor - Google Patents
Alarm threshold value adaptive method for distributed optical fiber temperature sensor Download PDFInfo
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- CN102881107A CN102881107A CN2012103642612A CN201210364261A CN102881107A CN 102881107 A CN102881107 A CN 102881107A CN 2012103642612 A CN2012103642612 A CN 2012103642612A CN 201210364261 A CN201210364261 A CN 201210364261A CN 102881107 A CN102881107 A CN 102881107A
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Abstract
The invention relates to an alarm threshold value adaptive method for a distributed optical fiber temperature sensor, and belongs to the technical field of optical fiber sensing. The method includes: utilizing a DTS (digital transmission system) mainframe to control a light source to send out periodic light pulse to enter a sensing optical fiber, collecting Stokes signals and anti-Stokes signals of backward Raman scattering, calculating temperature distribution of the sensing optical fiber according to temperature of a reference optical fiber ring inside the mainframe, and calculating an alarm threshold value according to ambient temperature curve function. The alarm threshold value is automatically adjusted according to temperature of external environment, so that problems of false alarm and alarm failure of conventional single threshold value are solved, system adaptability is improved, and system reliability is improved.
Description
Technical field
The present invention relates to the alarm threshold value adaptive approach of distributed optical fiber temperature sensor, belong to the technical field of Fibre Optical Sensor.
Background technology
Distributed optical fiber temperature sensor (Distributed Optic Fiber Temperature Sensor, abbreviation DOFTS, usually be called for short DTS) be a kind of novel sensor, its principle of work is based on Raman scattering or the thermally sensitive characteristic of Brillouin scattering in the fiber core, and the optical time domain reflection technology in conjunction with maturation is accurately located the temperature information in the optical fiber, thereby has realized the measurement of Temperature Distribution.
Compare with traditional sensor, DTS has the advantage of many brilliances: as sensing media, one-shot measurement just can obtain thousands of somes temperature informations along fiber distribution with optical fiber itself, has realized the measurement of continuous distribution formula, has reduced uncertainty of measurement; Far measuring distance, Measuring Time is short, is fit to remote real-time monitoring; Highly sensitive, measuring accuracy is high, and rate of false alarm, rate of failing to report are low; Corrosion-resistant, water-fast, fire-resistant, electromagnetic interference (EMI) is immune, reliability is high, maintenance cost is low.
At present, DTS surveys at highway, subway tunnel, the cable tunnel fire alarm, and the occasions such as pipelines and petrochemical pipelines temperature monitoring are widely used.For example, in the cable tunnel fire alarm, usually temperature measuring optical cable is attached to cable surface and lays, then alarm threshold value (for example maximum temperature is set as 60 ℃) is set and measures at the DTS main frame, when the temperature of cable surface surpassed the threshold value of setting, the DTS main frame sent alerting signal.Yet, owing to not considering the variation in weather and geographic position, single threshold value only is set, tend to cause and report by mistake or fail to report, especially in summer and winter or the larger place of temperature Change.
Summary of the invention
Technical matters to be solved by this invention is the deficiency for the above-mentioned background technology, and the alarm threshold value adaptive approach of distributed optical fiber temperature sensor is provided.
The present invention adopts following technical scheme for achieving the above object:
The alarm threshold value adaptive approach of distributed optical fiber temperature sensor comprises the steps:
Step 1 is laid temperature-measuring optical fiber in the thermometric zone, and the device of measures ambient temperature;
Step 2 is connected the sensor of temperature-measuring optical fiber, measures ambient temperature with the DTS main frame;
Step 3, DTS host computer control light source sends periodic light pulse and enters temperature-measuring optical fiber, gathers Stokes and the anti-Stokes signal of backward Raman scattering in the sensor fibre;
Step 4, DTS main frame are according to the temperature of main frame internal reference fiber optic loop, and the Stokes of step 3 collection and the temperature in anti-Stokes calculated signals thermometric zone;
Step 5, the DTS main frame calculates alarm threshold value according to the environment temperature curvilinear function;
Step 6, DTS main frame are sent alerting signal when the thermometric regional temperature is higher than alarm threshold value.
In the alarm threshold value adaptive approach of described distributed optical fiber temperature sensor, the device of the described measures ambient temperature of step 1 is fiber-optical grating temperature sensor.
In the alarm threshold value adaptive approach of described distributed optical fiber temperature sensor, the device of the described measures ambient temperature of step 1 is the tap of temperature-measuring optical fiber.
In the alarm threshold value adaptive approach of described distributed optical fiber temperature sensor, the described environment temperature curvilinear function of step 5 is monthly mean temperature curvilinear function or linear function or parabolic function.
The present invention adopts technique scheme, has following beneficial effect: according to the temperature of external environment, automatically adjust alarm threshold value, solved the problem that traditional single threshold value is prone to wrong report, fails to report phenomenon, strengthen the adaptability of system, improved the reliability of system.
Description of drawings
Fig. 1 is the first laying scheme schematic diagram of temperature-measuring optical fiber.
Fig. 2 is the second laying scheme schematic diagram of temperature-measuring optical fiber.
The number in the figure explanation: 101 is the DTS main frame, and 102 is temperature-measuring optical fiber, and 103 is the thermometric zone, and 104 are conduction optical fiber, and 105 is point sensor, and 106 is the tap of temperature-measuring optical fiber.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to invention:
The alarm threshold value adaptive approach of distributed optical fiber temperature sensor is characterized in that comprising the steps:
Step 1 is laid temperature-measuring optical fiber in the thermometric zone, and the device of measures ambient temperature.
The mode of laying temperature-measuring optical fiber has two schemes as shown in Figure 1 and Figure 2: among Fig. 1, the environment temperature that each thermometric zones 103 are measured in the temperature measuring optical cable 102 a plurality of thermometrics zone 103 that is laid in, point sensor 105 passes to DTS main frame 101 by point sensor bus or conduction optical fiber 104; Among Fig. 2, the temperature measuring optical cable 102 a plurality of thermometrics zone 103 that is laid in, and extract the environment temperature that some sections temperature measuring optical cable taps 106 are used for measuring each thermometric zone 103 out, DTS main frame 101 is according to the environment temperature that measures.The device of measures ambient temperature can adopt fiber-optical grating temperature sensor, also can adopt special-purpose thermometric chip (for example unibus system DS18B20 chip), can also adopt the temperature measurement circuits such as traditional PT100, thermopair.
Step 2 is connected the sensor of temperature-measuring optical fiber, measures ambient temperature with the DTS main frame.
Step 3, DTS host computer control light source sends periodic light pulse and enters temperature-measuring optical fiber, starts simultaneously the Stokes signal P of backward Raman scattering in the high-speed collection card synchronous acquisition sensor fibre
s(T) and anti-Stokes signal P
As(T):
Step 4, DTS main frame are according to the temperature of main frame internal reference fiber optic loop, and the Stokes signal P of step 3 collection
s(T) and anti-Stokes signal P
As(T), by formula:
Calculate the temperature T in thermometric zone,
Wherein, T
0Be the reference point temperature, k is Boltzmann constant, and h is Planck's constant, and Δ v is the Raman scattering frequency displacement, P
s(T
0), P
As(T
0) be respectively Stokes signal and the anti-Stokes signal of main frame internal reference fiber optic loop.
Step 5, the DTS main frame calculates alarm threshold value according to the environment temperature curvilinear function:
When (1) the environment temperature curve was the monthly mean temperature curvilinear function: the maximum temperature alarm threshold value can be unified to be set to higher 30 ℃ than environment temperature;
(2) the environment temperature curve is that linear function can be T
Th=kT
C+ T
0, wherein, T
ThBe temperature alarming threshold value, T
CBe the environment temperature that measures, k is coefficient, T
0Be constant; Set k and T
0After, just can be according to the environment temperature T that measures
CCalculate temperature alarming threshold value T
Th
(3) the environment temperature curve is parabolic function
Wherein, T
ThBe temperature alarming threshold value, T
CBe the environment temperature that measures, a, b, c are coefficient.After setting a, b, c, just can be according to the environment temperature T that measures
CCalculate temperature alarming threshold value T
Th
Step 6, DTS main frame are sent alerting signal when the thermometric regional temperature is higher than alarm threshold value.
Utilize method of the present invention, according to the temperature of external environment, automatically adjust alarm threshold value, solved the problem that traditional single threshold value is prone to wrong report, fails to report phenomenon, strengthened the adaptability of system, improved the reliability of system.
Claims (4)
1. the alarm threshold value adaptive approach of distributed optical fiber temperature sensor is characterized in that comprising the steps:
Step 1 is laid temperature-measuring optical fiber in the thermometric zone, and the device of measures ambient temperature;
Step 2 is connected the sensor of temperature-measuring optical fiber, measures ambient temperature with the DTS main frame;
Step 3, DTS host computer control light source sends periodic light pulse and enters temperature-measuring optical fiber, gathers Stokes and the anti-Stokes signal of backward Raman scattering in the sensor fibre;
Step 4, DTS main frame are according to the temperature of main frame internal reference fiber optic loop, and the Stokes of step 3 collection and the temperature in anti-Stokes calculated signals thermometric zone;
Step 5, the DTS main frame calculates alarm threshold value according to the environment temperature curvilinear function;
Step 6, DTS main frame are sent alerting signal when the thermometric regional temperature is higher than alarm threshold value.
2. according to the alarm threshold value adaptive approach with distributed optical fiber temperature sensor claimed in claim 1, the device that it is characterized in that measures ambient temperature described in the step 1 is fiber-optical grating temperature sensor.
3. according to the alarm threshold value adaptive approach with distributed optical fiber temperature sensor claimed in claim 1, the device that it is characterized in that measures ambient temperature described in the step 1 is the tap of temperature-measuring optical fiber.
4. according to claim 1 and 2 or the alarm threshold value adaptive approach of 3 described distributed optical fiber temperature sensors, it is characterized in that the environment temperature curvilinear function described in the step 5 is monthly mean temperature curvilinear function or linear function or parabolic function.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103353359A (en) * | 2013-06-25 | 2013-10-16 | 广州市科思通技术有限公司 | Distributed temperature-sensitive optical fiber one-point calibration method |
| CN104199433A (en) * | 2014-09-26 | 2014-12-10 | 胡景宗 | Centralized controlling auxiliary pre-warning system in heat-engine plant |
| CN106023509A (en) * | 2016-07-25 | 2016-10-12 | 上海腾盛智能安全科技股份有限公司 | Monitoring system used in fire mode |
| DE102015207165A1 (en) | 2015-04-21 | 2016-10-27 | Robert Bosch Gmbh | A battery system and method for monitoring a temperature of a battery system |
| US20180136054A1 (en) * | 2016-11-11 | 2018-05-17 | Kidde Technologies, Inc. | High sensitivity fiber optic based detection |
| CN108414113A (en) * | 2018-03-15 | 2018-08-17 | 山东微感光电子有限公司 | The fire alarm system and method for fiber optic temperature are predicted with multi-point temperature coefficient of dispersion |
| CN108922105A (en) * | 2018-06-26 | 2018-11-30 | 深圳市中电数通智慧安全科技股份有限公司 | A kind of smoke sensor device and its management method and device |
| CN109211431A (en) * | 2018-08-27 | 2019-01-15 | 青岛益堃达热能设备有限公司 | Distributed fiber optic temperature monitoring method and system |
| GB2566692A (en) * | 2017-09-20 | 2019-03-27 | Aiq Dienstleistungen Ug Haftungsbeschraenkt | Condition monitoring of an object |
| CN109632137A (en) * | 2019-02-19 | 2019-04-16 | 杭州线感光电技术有限公司 | A kind of two-dimensional spatial distribution formula optical fiber temperature-measurement method |
| US10423456B2 (en) | 2014-07-31 | 2019-09-24 | Hewlett Packard Enterprise Development Lp | Dynamic adjustment of resource utilization thresholds |
| CN111899460A (en) * | 2020-07-27 | 2020-11-06 | 山东工商学院 | Remote fire detection system and method based on video image |
| CN111998963A (en) * | 2020-08-21 | 2020-11-27 | 云南电网有限责任公司电力科学研究院 | Alarm threshold value adjusting method and device applied to temperature detection equipment |
| CN112991657A (en) * | 2021-02-08 | 2021-06-18 | 四川省铭阳睿智科技有限公司 | Forest fire intelligent early warning control system based on 5G communication technology |
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| CN103353359A (en) * | 2013-06-25 | 2013-10-16 | 广州市科思通技术有限公司 | Distributed temperature-sensitive optical fiber one-point calibration method |
| US10423456B2 (en) | 2014-07-31 | 2019-09-24 | Hewlett Packard Enterprise Development Lp | Dynamic adjustment of resource utilization thresholds |
| CN104199433A (en) * | 2014-09-26 | 2014-12-10 | 胡景宗 | Centralized controlling auxiliary pre-warning system in heat-engine plant |
| DE102015207165A1 (en) | 2015-04-21 | 2016-10-27 | Robert Bosch Gmbh | A battery system and method for monitoring a temperature of a battery system |
| CN106023509A (en) * | 2016-07-25 | 2016-10-12 | 上海腾盛智能安全科技股份有限公司 | Monitoring system used in fire mode |
| US20180136054A1 (en) * | 2016-11-11 | 2018-05-17 | Kidde Technologies, Inc. | High sensitivity fiber optic based detection |
| US10852202B2 (en) * | 2016-11-11 | 2020-12-01 | Kidde Technologies, Inc. | High sensitivity fiber optic based detection |
| GB2566692A (en) * | 2017-09-20 | 2019-03-27 | Aiq Dienstleistungen Ug Haftungsbeschraenkt | Condition monitoring of an object |
| CN108414113A (en) * | 2018-03-15 | 2018-08-17 | 山东微感光电子有限公司 | The fire alarm system and method for fiber optic temperature are predicted with multi-point temperature coefficient of dispersion |
| CN108922105A (en) * | 2018-06-26 | 2018-11-30 | 深圳市中电数通智慧安全科技股份有限公司 | A kind of smoke sensor device and its management method and device |
| CN109211431A (en) * | 2018-08-27 | 2019-01-15 | 青岛益堃达热能设备有限公司 | Distributed fiber optic temperature monitoring method and system |
| CN109632137A (en) * | 2019-02-19 | 2019-04-16 | 杭州线感光电技术有限公司 | A kind of two-dimensional spatial distribution formula optical fiber temperature-measurement method |
| CN111899460A (en) * | 2020-07-27 | 2020-11-06 | 山东工商学院 | Remote fire detection system and method based on video image |
| CN111998963A (en) * | 2020-08-21 | 2020-11-27 | 云南电网有限责任公司电力科学研究院 | Alarm threshold value adjusting method and device applied to temperature detection equipment |
| CN112991657A (en) * | 2021-02-08 | 2021-06-18 | 四川省铭阳睿智科技有限公司 | Forest fire intelligent early warning control system based on 5G communication technology |
| CN114360190A (en) * | 2021-12-31 | 2022-04-15 | 上海震旦施密茨消防装备有限公司 | Fire alarm system for underground cable and working method thereof |
| CN114360190B (en) * | 2021-12-31 | 2024-03-22 | 上海震旦施密茨消防装备有限公司 | Fire alarm system for underground cable and working method thereof |
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