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Fiber bragg grating temperature detection system

A technology of optical fiber Bragg and detection system, applied in thermometers, thermometers with physical/chemical changes, measuring devices, etc., can solve the problems of no spatial positioning, broadband light source bandwidth, etc., to reduce detection costs and save bandwidth resources Effect

Inactive Publication Date: 2009-09-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

Chinese Patent No. 02115542.9 proposes a technology that utilizes a broadband light source to irradiate identical gratings, and then uses matched filtering to realize temperature alarming.

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  • Fiber bragg grating temperature detection system
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Embodiment

[0017] Such as figure 1 As shown, the fiber Bragg grating temperature detection system in this example includes a laser, a coupler and a sensor network composed of n distribution units (n≥1, which is the number of branches of the coupler). The structure of each distribution unit includes circulator, FBG and sensing signal processing modules, such as figure 2 shown. The wavelength emitted by the laser is λ S The sensing laser is modulated and enters the sensor network through the coupler in the state of light pulse. In the sensor network, all FBGs have basically the same central reflection wavelength λ C . In each distribution unit, the sensing laser enters the FBG through the circulator, and the backscattered light enters the sensing signal processing module through the circulator. When the temperature changes, because the temperature of each FBG is different, the reflected wavelength of the FBG center moves differently, and the reflected and demodulated signal presents ...

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Abstract

The invention relates to a technique for detecting temperature by using identical fiber grating as a sensor, and discloses a temperature detection system which has relatively low cost and can perform space orientation, aiming at overcoming the defect that the prior temperature detection system can not perform space orientation. The fiber bragg grating temperature detection system comprises a laser, a coupler, a circulator, a sensing network formed by FBGs and a sensing signal processing module. The sensing laser sent by the laser after being modulated modulation is divided into n paths to enter the sensing network through the coupler. In each path of sensing network, the sensing laser enters into the FBGs through the circulator. Back scattering light enters into the sensing signal processing module through the circulator. All FBGs in the sensing network have substantially identical central reflection wavelength. The invention is used for temperature detection alarm, is particularly suitable for denser quasi-distributed detection of temperature, saves bandwidth source, does not need complex demodulating technology, and reduces the detection cost.

Description

technical field [0001] The present invention relates to a quasi-distributed fiber Bragg grating temperature detection system, in particular to a system that uses an identical fiber Bragg grating as a sensor for temperature detection and uses OTDR (Optical Time Domain Reflectometer) technology for positioning Background technique [0002] As a new type of sensor, fiber Bragg grating (abbreviated as: FBG) has good stability, reliability, insensitivity to electromagnetic waves, small size, and is suitable for use in high temperature, corrosive or dangerous environments. The advantages. When the external temperature changes, the central wavelength of the FBG will drift, and the external temperature change can be obtained by detecting the central wavelength drift, so as to realize the fire alarm. The usual FBG temperature sensing system adopts the wavelength division multiplexing method, which seriously occupies the wavelength resources. At the same time, the wavelength division...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01D5/26G08B17/06G01K11/3206
Inventor 饶云江冉曾令补冲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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