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A Time-Domain Distributed Optical Fiber Sensing Method with Variable Spatial Resolution

A distributed optical fiber and spatial resolution technology, which is applied in the direction of using optical devices to transmit sensing components, can solve the problems of increased system cost and high device speed requirements, and achieve the effect of improving spatial resolution and variable spatial resolution.

Active Publication Date: 2021-10-01
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

However, the narrower the optical pulse width, the higher the system's requirements on the rate of the device, leading to an increase in system cost

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  • A Time-Domain Distributed Optical Fiber Sensing Method with Variable Spatial Resolution

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Experimental program
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Embodiment

[0025] Example: such as figure 1 , a time-domain distributed optical fiber sensing method with variable spatial resolution, the steps are as follows:

[0026] a) Set the sampling frequency of the two A / Ds as f=1 / (Δτ p ), Δτ p is half of the light pulse width, and the sampling time difference is Δτ c ;

[0027] b) Test 0 to cΔτ c / n The parameters of the sensing fiber segment, the specific measurement parameters are determined by the measurement system, such as temperature and stress;

[0028] c) Record the sampling value I of the two A / Ds 2 (t 0 +Δτ c +iΔτ p ) and I 1 (t 0 +iΔτ p ), i is a natural number;

[0029] d) seek I 2 (t 0 +Δτ c +iΔτ p )-I 1 (t 0 +iΔτ p );

[0030] e) Since 0 to cΔτ c The parameters of the / n sensing fiber section have been determined, and then combined with I 2 (t 0 +Δτ c +iΔτ p )-I 1 (t 0 +iΔτ p ), then (i+1)δL to (i+1)δL+cΔτ can be obtained in turn c / n senses the parameters of the fiber segment. Therefore, the spati...

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Abstract

The invention discloses a time-domain distributed optical fiber sensing method with variable spatial resolution, which is realized by controlling the sampling start time of two acquisition channels and calculating the difference between the two acquisition channels. The advantages of the present invention are: the difference in sampling time between the first and two acquisition channels can be much smaller than the width of the optical pulse, so the spatial resolution can be greatly improved; the difference in sampling time between the second and two channels can be adjusted, so variable space can be realized resolution.

Description

technical field [0001] The invention relates to the technical field of time-domain distributed optical fiber sensing, in particular to a time-domain distributed optical fiber sensing method with variable spatial resolution, which is a method for improving the spatial resolution of a time-domain distributed optical fiber sensing system . Background technique [0002] Distributed optical fiber sensing system has broad application prospects. It can be used for monitoring of pipeline leakage and intrusion, monitoring of perimeter security, health monitoring of bridges and tunnels, monitoring of landslides, and protection of people's lives. Property security is of great significance. [0003] In time-domain distributed fiber optic sensing, the spatial resolution is determined by the width of the light pulse. However, the narrower the optical pulse width, the higher the system's requirements on the rate of the device, leading to an increase in system cost. For distributed Brill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/353
CPCG01D5/353
Inventor 万生鹏刘恒张思军钟海华张正平张彬熊新中
Owner NANCHANG HANGKONG UNIVERSITY