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Optical fiber sensor system for measuring static/dynamic strain and temperatures simultaneously and method for optical fiber sensor system

A technology of optical fiber sensor and dynamic strain, applied to thermometers, thermometers, measuring devices, etc. that change physically/chemically, can solve the problem of static strain insensitivity, and achieve the effect of curbing man-made accidents and reducing costs

Active Publication Date: 2012-04-25
饶云江
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  • Abstract
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AI Technical Summary

Problems solved by technology

It can realize the function of early warning and avoiding disasters by monitoring slight disturbances before accidents, but it is not sensitive to static strain

Method used

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  • Optical fiber sensor system for measuring static/dynamic strain and temperatures simultaneously and method for optical fiber sensor system
  • Optical fiber sensor system for measuring static/dynamic strain and temperatures simultaneously and method for optical fiber sensor system

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Embodiment approach

[0022] The optical fiber sensor system for simultaneous measurement of static / dynamic strain and temperature of the present invention integrates Φ-OTDR and B-OTDA distributed optical fiber sensing technologies, and by sharing most of the expensive photoelectric devices in the two systems, it does not affect other Under the premise of performance, the maximum possible cost savings can be achieved, and the efficiency of the device can be optimized. In view of the different requirements of the two systems for the light source, the phase modulator is used in this technical solution to broaden the narrow linewidth light source (3KHz) that meets the Φ-OTDR to 2MHz, so that it can meet the light source requirements of the B-OTDA system. Combining the advantages of Φ-OTDR's dynamic real-time monitoring with the advantages of B-OTDA for static strain measurement, the present invention provides a solution for occasions that require both dynamic and static measurement, monitoring and earl...

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Abstract

The invention discloses an optical fiber sensor system for measuring static / dynamic strain and temperatures simultaneously and a method for the optical fiber sensor system. On the basis of a B-optical time-domain analyzer (OTDA) sensor system and a phi-optical time-domain reflectometry (OTDR) sensor system, an operation mode is switched through an optical switch, so that the optical fiber sensor system is skipped in two operation modes, and the static strain and dynamic disturbance can be measured simultaneously. In the invention, the dynamic disturbance and strain sensing based on a phi-OTDR technology and temperature distribution and static deformation sensing based on a B-OTDA principle are combined, so that a set of sensing system has the functions of a phi-OTDR and a B-OTDA, the defects that the conventional B-OTDA can only be used for the static strain and instant dynamic strain or external weak disturbance cannot be captured are effectively overcome, and the defects that the conventional phi-OTDR can only detect the dynamic strain and cannot be used for static measurement are overcome simultaneously; and the system and the method have great application prospects in long-distance distributed type sensing systems.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and relates to an optical fiber sensor system capable of simultaneous intrusion detection and temperature / strain multi-parameter real-time measurement, and constitutes a composite optical fiber sensor system with intrusion warning function and temperature and strain real-time monitoring function. Background technique [0002] With the continuous construction and popularization of large-scale infrastructure facilities such as bridges, tunnels, dams, high-speed railways, highways, and major engineering facilities such as power communication networks, oil and gas pipelines, energy storage bases, large power stations, etc., they are especially It is more and more important to monitor the safety and health of large-scale national defense infrastructure facilities to find faults in time, prevent and mitigate disasters, and ensure the safety of the country and people's lives and properties....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01K11/32G01K11/324
Inventor 饶云江吴宇张田虎
Owner 饶云江
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