High stability optical fiber sensing device for eliminating light intensity disturbance and demodulation method thereof

A fiber-optic sensing, high-stability technology, used in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as distortion of demodulation results, achieve simple structure, reduce operating costs, and eliminate unstable light sources. Effect

Active Publication Date: 2017-05-10
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the demodulation result is distorted when the light intensity in the optical fiber sensor is unstable, and propose a high-stability optical fiber sensing device and demodulation method that eliminates light intensity disturbances

Method used

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  • High stability optical fiber sensing device for eliminating light intensity disturbance and demodulation method thereof
  • High stability optical fiber sensing device for eliminating light intensity disturbance and demodulation method thereof
  • High stability optical fiber sensing device for eliminating light intensity disturbance and demodulation method thereof

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Embodiment 1

[0034] Such as figure 1As shown, a fiber optic sensing device with high stability that eliminates light intensity disturbances, the sensing device includes: a broadband light source 1, an isolator 2, an optical fiber sensing array 3, a photodetector array 4, and a data acquisition card 5 and a microcomputer 6; the broadband light source is connected to the optical fiber sensing array through an isolator, and the optical signal output by the optical fiber sensing array is detected by the photodetector array, and then the output signal of the photodetector array is converted from analog to digital by the data acquisition card , and then the microcomputer uses the demodulation algorithm to perform data processing on the output signal.

[0035] The composition mode of described optical fiber sensing array is as follows figure 2 As shown: the a port of the 2×2 coupler C0 is connected to the isolator as the input end of the optical fiber sensing array, and the d port of the 2×2 co...

Embodiment 2

[0041] The specific structure of this embodiment is the same as that of Embodiment 1, wherein the light source is a broadband light source, and the power is selected as 150mw. The carrier frequency generated by the signal generator is selected as 10000Hz, the signal sampling frequency in the demodulation circuit is selected as 500KHz, the signal to be tested is selected as a sine wave with an amplitude of 1 and a frequency of 700Hz, the frequency of the reference signal is 2000Hz, and a light intensity of 50Hz is introduced disturbance. according to Figure 6 It can be concluded that the traditional demodulation algorithm demodulates distortion, and the algorithm of the present invention can demodulate the signal to be tested correctly.

Embodiment 3

[0043] The specific structure of this embodiment is the same as that of Embodiment 1, wherein the light source is a broadband light source, and the power is selected as 150mw. The carrier frequency generated by the signal generator is selected as 10000Hz, the signal sampling frequency in the demodulation circuit is selected as 500KHz, the signal to be tested is selected as a sine wave with an amplitude of 1 and a frequency of 700Hz, the frequency of the reference signal is 2000Hz, and a light intensity of 100Hz is introduced disturbance. according to Figure 7 It can be concluded that the traditional demodulation algorithm demodulates distortion, and the algorithm of the present invention can demodulate the signal to be tested correctly.

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Abstract

The invention provides a high stability optical fiber sensing device for eliminating light intensity disturbance and a demodulation method thereof. A sinusoidal reference signal of constant amplitude is introduced on a reference optical fiber to estimate the light intensity disturbance so as to eliminate demodulation distortion caused by light intensity instability and enhance the stability of a sensing system. In the signal separation part, a reference signal and a signal to be measured are separated by using a wavelength division multiplexer. In the demodulation part, the change of the light intensity is obtained by demodulate the interference light intensity including the reference signal and then the demodulation result of the signal to be measured is compensated. The advantages of high stability optical fiber sensing device for eliminating the light intensity disturbance and the demodulation method thereof are that demodulation distortion caused by light source instability can be effectively eliminated based on the light path structure and the demodulation method. Array form of optical fiber sensing is facilitated and the demodulation effect is enabled to be better.

Description

technical field [0001] The invention belongs to the technical field of interference optical fiber sensing, in particular to a highly stable optical fiber sensing device and method capable of eliminating light intensity interference. Background technique [0002] Vibration widely exists in industrial activities and people's lives, such as earthquakes, the operation of machine tools in the mechanical industry, shaking of railways and bridges, etc. It is of great practical significance to realize the early prediction of earthquakes by vibration sensing, the detection of the working state of mechanical parts, the safety monitoring of railways and bridges, and the guarantee of the safety of long-distance oil transportation and power transmission lines. [0003] Optical fiber sensing has wide frequency transmission frequency, large information capacity, and low transmission loss, which is suitable for telemetry and remote control; it is sensitive to changes in the external environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 张爱玲张帅
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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