A Phase Sensitive Optical Time Domain Reflectometry System with Improved Dynamic Strain Measurement Range
A phase-sensitive light and measurement range technology, applied in measurement devices, optical devices, instruments, etc., can solve problems such as insufficient measurement range, and achieve the effect of simple, easy-to-implement, and easy-to-adjust system
Active Publication Date: 2021-10-08
安捷光通科技成都有限公司 +1
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[0003] In view of the shortcoming of insufficient measurement range in dynamic measurement of the prior art, the purpose of the present invention is to provide a simple, high-precision, high-stability phase-sensitive optical time-domain reflectometry system with improved dynamic strain measurement range to solve the problem based on phase solution. Disadvantages of tuned phase-sensitive optical time-domain reflectometry in practical applications
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[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0020] The structure of a phase-sensitive optical time-domain reflectometry system with improved dynamic strain measurement range is as follows: figure 1 As shown, the system consists of two parts, the optical path and the electric circuit.
[0021] The continuous light output by the tunable laser 1 is divided into two paths by the 9:1 fiber coupler-3, and the continuous light output by the narrow linewidth laser 2 is also divided into two paths by the 9:1 fiber coupler-4. The continuous light of 90% of the output arms of fiber coupler 1 3 and fiber coupler 2 4 is coupled together by the 1:1 fiber coupler 3 5, and the coupled dual-wavelength continuous light passes through any function The generator 6 drives the acousto-optic modulator 7 to modulate and generate pulsed detection light, and then through the erbium-doped fiber amplifie...
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The invention discloses a phase-sensitive optical time-domain reflection system with improved dynamic strain measurement range, specifically: the continuous light output by the tunable laser and the narrow-linewidth laser is respectively divided into two paths by a fiber coupler, one of which is coupled together , the acousto-optic modulator is driven by an arbitrary function generator to modulate to generate pulsed detection light, and then the optical power loss is compensated by an erbium-doped fiber amplifier, and then the pulsed detection light is injected into the sensing fiber through a fiber circulator, and the scattered light generated is passed through the circulator The output of the output is divided into two channels of scattered light; the continuous light output from the other channel is used as local light, and the polarization state is adjusted by the polarization controller, and then coupled with the two scattered lights through fiber couplers, and then photoelectric conversion is performed with a balanced detector. , use the two channels of the data acquisition card to collect at the same time, and finally use the host computer for post-processing. The invention is a phase-sensitive optical time-domain reflection system with simple design, high precision and high stability, and improved dynamic strain measurement range.
Description
technical field [0001] The invention belongs to the technical field of distributed optical fiber sensing, and in particular relates to a phase-sensitive optical time-domain reflection system with improved dynamic strain measurement range. Background technique [0002] In recent years, with the rapid development of oil and gas pipelines, high-speed rail, and large buildings, distributed optical fiber sensing technology has attracted more and more attention from all walks of life. Due to its many advantages, distributed optical fiber sensing technology has become a The key technology for external information perception in long-distance and harsh environments. The phase-sensitive optical time-domain reflectometry technology is a very important technology among many distributed optical fiber sensing technologies. It is mainly used in oil and gas pipelines, structural health monitoring, perimeter protection, earthquake monitoring, distributed acoustic wave detection and other fi...
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IPC IPC(8): G01B11/16
CPCG01B11/18
Inventor 闫连山何海军周银张信普潘炜
Owner 安捷光通科技成都有限公司