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Weak grating based single-component and three-component fiber grating vibration sensors and three-component fiber grating vibration sensing array

A technology of vibration sensor and optical fiber grating, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems of difficult to realize large-scale sensing unit networking, three-component optical fiber vibration sensor lateral cross-sensitivity, etc., to achieve lateral sensitivity reduction, The effect of high positioning accuracy and broad application prospects

Active Publication Date: 2019-09-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a single-component sensor based on a weak grating, which can realize large-scale Networking of sensing units to form a large-capacity sensing array based on a distributed three-component vibration sensor and sensing array based on a weak grating array

Method used

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  • Weak grating based single-component and three-component fiber grating vibration sensors and three-component fiber grating vibration sensing array
  • Weak grating based single-component and three-component fiber grating vibration sensors and three-component fiber grating vibration sensing array
  • Weak grating based single-component and three-component fiber grating vibration sensors and three-component fiber grating vibration sensing array

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specific Embodiment approach 1

[0029] Specific implementation mode 1: refer to figure 1 and figure 2 As shown, the single-component fiber grating vibration sensor specifically includes: a rigid beam 1, a fixed end 2, a set screw 3, a hollow elastic cylinder 4, a connecting frame 5, a mass block 6, a fiber grating 7, a movable end 8 and a miniature slide Block 9.

[0030] In the single-component fiber grating detector of this embodiment, the material of the hollow elastic cylinder 4 used is silicon rubber, and the specifications of the upper and lower hollow elastic cylinders are exactly the same, and they are symmetrically arranged on both sides of the mass block 6, and the mass block is made of ordinary metal material. The shape is processed into a cylinder, which saves space and facilitates installation. The elastic cylinder 4 and the mass block 6 are fixed with superglue to form an inertial element, and then the upper end and the fixed end 2 of the composed inertial element are fixed with superglue, a...

specific Embodiment approach 2

[0032] Specific implementation mode 2, this implementation mode is a further description of the single-component detector based on the specific implementation mode 1. Such as figure 1 , figure 2 As shown, the rigid beam, the fixed end, the movable end and the micro-slider are all processed from a material with better rigidity, and the surfaces of the fixed end, the movable end and the micro-slider are flat, and they are used as two inertial components. The elastic tube has the same specification and shape, the end face is flat, and the surface of the mass block is smooth and smooth. The surfaces of the elastic cylinder, the mass block, the fixed end and the movable end are fixed with superglue, and the surfaces are pasted flat without gaps, and are always kept parallel to each other.

specific Embodiment approach 3

[0033] Specific implementation mode 3, this implementation mode is further described on the specific implementation mode 2. Rigid beams are always perpendicular to the surfaces of the elastic tube, mass, and peripheral frame as they pass through the structure. The set screw fixes the fixed end and the rigid beam together, and the relative displacement between the fixed end and the rigid beam is always zero.

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Abstract

The invention discloses weak grating based single-component and three-component fiber grating vibration sensors and a three-component fiber grating vibration sensing array. The three-component fiber grating vibration sensor comprises three single-component fiber grating vibration sensors, as in Claims 1-3, in orthogonal combination, a sensing fiber comprises four weak gratings, and 3 blank fibers among the 4 adjacent weak gratings are wound around a connecting rack of the three single-component fiber grating vibration sensors. The structure of the single-component sensor is designed, the horizontal sensitivity is reduced greatly, the three-component vibration sensor is formed in a modularized packaging manner, and the disadvantages that the three-component fiber grating vibration sensor is sensitive in the intersection direction is overcome.

Description

technical field [0001] The invention belongs to the technical field of optical fiber vibration sensing, in particular to a single-component and three-component optical fiber grating vibration sensor and a sensing array based on a weak grating. Background technique [0002] At present, one of the major problems facing the development of oil and gas resources in my country is the difficulty and high cost of exploration. Judging from the quality of China's current remaining oil and gas resources, the proportion of "low-grade" resources such as low-permeability, ultra-low-permeability oil resources, and heavy oil resources continues to increase. With the deepening of exploration and development, the remaining oil resources are of poor quality, The proportion of difficult mining will increase. Therefore, higher requirements are put forward for the seismic wave exploration technology, and the traditional electromagnetic seismic wave detection technology has great limitations and ...

Claims

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Application Information

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IPC IPC(8): G01V1/18G01H9/00
CPCG01H9/004G01V1/18G01V2210/14
Inventor 唐健冠蔡龙宝梁磊蒋言实杨明红邓艳芳甘维兵
Owner WUHAN UNIV OF TECH
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