Alarm threshold value adaptive method for distributed optical fiber temperature sensor

A temperature sensor, distributed optical fiber technology, applied in electrical fire alarms, thermometers, thermometers with physical/chemical changes, etc. False positives, the effect of enhanced adaptation

Inactive Publication Date: 2013-01-16
KINGSHORE NEW RESOURCES ELECTRIC JIANGSU
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Problems solved by technology

However, setting a single threshold without considering changes in climate and geographical location often results in false positives or negative negatives, especially in summer and winter or places with large temperature changes

Method used

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  • Alarm threshold value adaptive method for distributed optical fiber temperature sensor
  • Alarm threshold value adaptive method for distributed optical fiber temperature sensor
  • Alarm threshold value adaptive method for distributed optical fiber temperature sensor

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Embodiment Construction

[0021] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0022] The alarm threshold self-adaptive method of distributed optical fiber temperature sensor is characterized in that comprising the following steps:

[0023] Step 1, laying temperature-measuring optical fibers and devices for measuring ambient temperature in the temperature-measuring area.

[0024] The method of laying temperature measuring optical fiber is as follows figure 1 , figure 2 Two scenarios are shown: figure 1 Among them, the temperature measurement optical cable 102 is laid in multiple temperature measurement areas 103, and the ambient temperature of each temperature measurement area 103 is measured by the point sensor 105 and transmitted to the DTS host 101 by the point sensor bus or the conductive optical fiber 104; figure 2 Among them, the temperature measurement optical cable 102 is laid in multiple temperature measurement areas 103, and s...

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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 [0001] The invention relates to an adaptive method for an alarm threshold of a distributed optical fiber temperature sensor, and belongs to the technical field of optical fiber sensing. Background technique [0002] Distributed Optic Fiber Temperature Sensor (DOFTS, usually referred to as DTS) is a new type of sensor, its working principle is based on the temperature-sensitive characteristics of Raman scattering or Brillouin scattering in the fiber core, And combined with mature optical time domain reflectometry technology to precisely locate the temperature information in the optical fiber, thus realizing the measurement of temperature distribution. [0003] Compared with traditional sensors, DTS has many outstanding advantages: using the optical fiber itself as the sensing medium, temperature information of thousands of points distributed along the optical fiber can be obtained in one measurement, realizing continuous distributed measurement and reducing me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B17/06G01K11/32G01K11/324
Inventor 周金龙沈平付松年唐明朱冬宏田群张凯
Owner KINGSHORE NEW RESOURCES ELECTRIC JIANGSU
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