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Large capacity coding optical fiber grating sensing monitoring system

A fiber grating and monitoring system technology, applied in the field of sensing, can solve the problems of limited number of probes and inability to meet actual needs, etc.

Active Publication Date: 2004-11-17
WUHAN WUTOS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, limited by the above two factors, the number of probes in the fiber grating temperature sensing monitoring system with a single grating as the probe is very limited, which is far from meeting the actual needs

Method used

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  • Large capacity coding optical fiber grating sensing monitoring system
  • Large capacity coding optical fiber grating sensing monitoring system
  • Large capacity coding optical fiber grating sensing monitoring system

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: The system will be described in detail below by taking the detection of temperature and the coded fiber grating composed of double gratings as an example.

[0028] The coded fiber grating sensing monitoring method in the present invention adopts "quasi-distributed fiber grating sensing" technology to monitor the temperature or stress and strain of the monitoring point for a long time, stably, and without timing tracking. figure 1 Schematic diagram of the structure of the system, and its specific implementation steps are;

[0029] 1) Determine the distribution of stress monitoring points: According to the specific conditions of the monitored site and the engineering application conditions, determine the number of measurement points and the measurement distribution method, roughly estimate the temperature or stress and strain values ​​at each point, and calculate the overall stress and strain distribution on the site.

[0030] 2) Determine the dual wavelengt...

Embodiment 2

[0062] Such as figure 1 , Figure 4 Shown is an embodiment of a fiber grating sensing array with three gratings.

[0063] It includes fiber grating array 1; broadband laser light source 2, 3; Y-type splitter 4, 5; demodulator 6, 7; data acquisition module 8; data processing computer 9 and control module 10 and so on. Among them: the first broadband light source 2 works in the 1310nm window, the bandwidth is not less than 30nm, it couples light into the grating array through a Y-shaped splitter 4 that matches it, and the other branch of the Y-shaped splitter The port is connected to the corresponding demodulator 6 . The second broadband light source 3 works in the 1550nm window, and the bandwidth is not less than 30nm. It couples the light into the grating array through another matching Y-type splitter 5, and its other split port is connected to the corresponding demodulator. device7. The signals output by the two sets of demodulation devices pass through the corresponding ...

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Abstract

The invention is a kind of large capacity coded fiber grating sensing and monitoring system, which is made up of a wideband light source with wavelength 1550nm, a wideband light source with wavelength 1310nm, 1550nm window Y type branching unit, 1310nm window Y type branching unit, coded fiber grating array, large capacity 1550nm demodulator, large capacity 1310nm demodulator, data processing system, control system and correspondent fiber, wires. Because of using multi-grating coding technology, namely, writes two or more gratins with different centre wavelengths into the same position of the fiber, carries on coding and measurement to the position, temperature, stress, strain and health state of the measured point, the system has a high precision, the stability is good, the information quantity is large.

Description

technical field [0001] The invention belongs to the field of sensor technology, and in particular relates to a large-capacity coded optical fiber grating sensor monitoring system for multi-point distributed sensor. Background technique: [0002] Sensors have a very wide range of applications and have been a research hotspot for many years. Since the optical fiber is made of insulating and high-temperature-resistant materials, the optical fiber sensor can work in a harsh environment with strong electromagnetic fields, high temperature, corrosiveness, and explosion hazards, so the optical fiber sensor has a wider range of applications than other sensors. In recent years, with the emergence of semiconductor lasers, the continuous development of optoelectronic technology and the reduction of the cost of optoelectronic devices, the research of optical fiber sensors has become a branch of much attention. Existing large-capacity distributed optical fiber sensing technologies inclu...

Claims

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Application Information

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IPC IPC(8): G01K11/3206G01L1/24
Inventor 姜德生梅家纯高雪清陈宏波南秋明罗裴
Owner WUHAN WUTOS
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