Underwater soft medium-oriented optical fiber topography change sensor

A sensor and terrain deformation technology, which is applied in the direction of instruments, water resources assessment, and optical devices, etc., can solve the problems of small measurement range, interference of sensor measurement results, and inability to measure local deformation in a distributed manner.

Active Publication Date: 2021-04-23
LASER RES INST OF SHANDONG ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the problems of power supply, long-distance transmission signal attenuation, non-waterproof, and difficult reuse of electronic sensors, the layout is difficult, the system is complicated and the cost is high
[0006] The Scripps Institute of Oceanography at the University of California in the United States uses optical fiber sensors to observe the structural strain of the seafloor. The observation is similar to the observation method of ground fissures in land areas. The optical fiber is flattened on the surface of the seabed and anchored at both ends, and the stretched length of the optical fiber is measured to reflect the strain. The measurement accuracy of the lateral deformation of the

Method used

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  • Underwater soft medium-oriented optical fiber topography change sensor
  • Underwater soft medium-oriented optical fiber topography change sensor
  • Underwater soft medium-oriented optical fiber topography change sensor

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Embodiment 1

[0034] figure 1 A structural diagram of an optical fiber deformation sensor facing underwater soft media provided by the present invention, wherein, the first coupling structure 011, the coupling plate 0111, the second coupling structure 012, the static pressure hole 0121, the protrusion 0122, and the bellows 020 , static pressure microhole 0201, elastic connection structure 030, fiber Bragg grating 040, compensation fiber Bragg grating 050.

[0035] Both the first coupling structure 011 and the second coupling structure 012 are metal cylindrical structures, which are processed by metal, and contain multiple coupling pieces 0111 on the side wall, which can effectively improve the coupling strength with the soft medium; the first coupling structure 011 is in the A through hole is opened on the axis to allow the optical fiber to pass through and protect the internal optical fiber; the second coupling structure 012 is further processed with a protrusion 0122 on the central axis, ...

Embodiment 2

[0043] see image 3 , On the coupling sheet 0111 of the first coupling structure 011 and the second coupling structure 012, a support rod 060 is further pierced, wherein the support rod 060 is a metal structure, and a frame is formed by welding or screwing, and the support rod 060 and the first Both the coupling piece 0111 of the coupling structure 011 and the second coupling structure 012 are slidingly connected. When the lateral force is applied, under the protection of the support rod 060, the sensor is not easily deformed, so that the bending resistance performance is improved. When the axial force is received When functioning, the support rod 060 slides with the sensor, and the sensor is prone to deformation, thereby ensuring the measurement sensitivity without affecting the measurement accuracy.

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Abstract

The invention relates to an optical fiber topography change sensor, and particularly discloses an underwater soft medium-oriented optical fiber topography change sensor. The sensor comprises a first coupling structure and a second coupling structure which are buried in an underwater soft medium and coupled to the soft medium; a corrugated pipe of which the two ends are respectively connected with the first coupling structure and the second coupling structure; an elastic connecting structure which is located in the corrugated pipe and has one end connected with the first coupling structure; and a fiber Bragg grating of which one end is connected with the elastic connecting structure the other end is connected with the second coupling structure, and two free ends extend out of the first coupling structure and the second coupling structure through through holes respectively. According to the invention, deformation measurement of an underwater soft medium is realized on the basis of a small structure, and the sensor has the advantages of small size and simple structure; and the sensor can be effectively coupled to a soft medium, is high in measurement precision, is not limited by the maximum dependent variable of an optical fiber, and enlarges the measurement range.

Description

technical field [0001] The invention relates to an optical fiber deformation sensor, in particular to an optical fiber deformation sensor facing underwater soft media. Background technique [0002] Through seabed deformation observation and seabed stability monitoring, seabed deformation data caused by submarine landslides, land reclamation, natural gas hydrate and other resource development can be obtained, so as to better analyze the occurrence mechanism of submarine landslides and other geological disasters, and provide marine engineering It is of great significance to predict the occurrence of geological disasters and ensure the stability of marine engineering by providing a more effective early warning method for the safety of marine engineering. [0003] Submarine deformation observation needs to bury measuring instruments in the seabed in advance, which is difficult and expensive. Submarine geology is mostly soft media such as sediment, and it is difficult to couple ...

Claims

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Application Information

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IPC IPC(8): G01B11/16G01D21/02G01D18/00
CPCG01B11/16G01D21/02G01D18/00Y02A90/30
Inventor 王昌王英龙倪家升张发祥董火民姜劭栋王金伟马龙王英英
Owner LASER RES INST OF SHANDONG ACAD OF SCI
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