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Double-direction four-channel coupled distribution-type optical-fiber Raman temperature measuring system

A distributed optical fiber, Raman temperature measurement technology, applied in the direction of thermometers, thermometers, measuring devices, etc. with physical/chemical changes, can solve the problem of low measurement accuracy, local temperature rise, inability to quickly and accurately locate temperature and position, etc. problem, to achieve the effect of long transmission distance, fast response speed and strong anti-electromagnetic interference ability

Active Publication Date: 2014-06-25
潍坊五洲浩特电气有限公司
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Problems solved by technology

[0004] The existing Raman temperature measurement system performs state detection, and the measurement accuracy is not high
For example, when monitoring the cable in real time, if a fault occurs at a certain point of the cable, the local temperature rises, and the temperature and position cannot be quickly and accurately located.

Method used

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  • Double-direction four-channel coupled distribution-type optical-fiber Raman temperature measuring system
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  • Double-direction four-channel coupled distribution-type optical-fiber Raman temperature measuring system

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Embodiment Construction

[0017] Specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, so as to better understand the present invention. It should be noted that in the following description, when detailed descriptions of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted here.

[0018] Such as figure 1 As shown, the bidirectional four-channel coupled distributed optical fiber Raman temperature measurement system of the present invention includes: a broadband light source 1, a bidirectional four-channel fiber coupler 2, a single-mode optical fiber 3, a first optical splitter 4, and a second optical splitter 5. The first photodetection circuit 6, the second photodetection circuit 7, the third photodetection circuit 8, the signal acquisition card 9 and the computer 10; wherein, the A port and the C port of the first optical fiber coupler 2 are respectively connected to the broad...

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Abstract

The invention relates to a double-direction four-channel coupled distribution-type optical-fiber Raman temperature measuring system, which comprises a broadband light source, a double-direction four-channel optical-fiber coupler, a single-mode fiber, a first optical splitter, a second optical splitter, a first photoelectric detection circuit, a second photoelectric detection circuit, a third photoelectric detection circuit, a signal collection card and a computer; and the double-direction four-channel coupled distribution-type optical-fiber Raman temperature measuring system is mainly used for the monitoring the temperature of the places such as electric power cables, tunnels, oil pipes, flammable and explosive places and the like in real time, the sensitivity is high, the response speed is fast, the transmission distance is long, and the electromagnetic interference resistance is strong. A Stokes channel and an anti-Stokes channel are used for demodulating the temperature information, and a Rayleigh channel is used for demodulating the position information; and the temperature resolution is 0.8 DEG C, the space resolution is equal to or less than 1m, and strong practicability is realized.

Description

technical field [0001] The invention relates to a bidirectional four-channel coupled distributed optical fiber Raman temperature measurement system, which belongs to the technical field of optical fiber measurement. Background technique [0002] Temperature sensing is one of the more active areas of development in fiber optic sensing technology. The traditional single-point mobile or quasi-distributed measurement method composed of multiple single points has disadvantages such as difficult installation, difficult wiring, and difficult maintenance. This monitoring method only detects the contact point of the probe, and the temperature measurement range is small; the traditional detection method The sensors of the system are susceptible to electromagnetic interference, the reliability of the system is low, and it is easily affected by the external environment such as transmission channels. The fully distributed temperature sensor is an effective method. The optical fiber can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/324
Inventor 魏鹏鞠明江王伟周亚光王钊李成贵
Owner 潍坊五洲浩特电气有限公司
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