Multi-point Displacement Measuring Method Based on Fiber Bragg Grating Sensing Technology

Abstract

The invention relates to a multi-point displacement testing method based on fiber grating sensing technology. The purpose of the present invention is to provide a multi-point displacement test method based on fiber grating sensing technology which is simple to implement, high in measurement accuracy and can realize on-line monitoring. The technical solution of the present invention is: a multi-point displacement testing method based on fiber grating sensing technology, which is characterized in that: it has a carrier, an inclinometer, a fiber grating string I and a fiber grating string II; the inclinometer is installed on one end of the carrier, As the displacement of 0 point; the fiber grating string I and the fiber grating string II are symmetrically installed on both sides of the carrier with respect to the center line of the carrier; the center wavelength λ of the fiber grating string I and the fiber grating string II is measured Bi0 , λ' Bi0 , as the initial value; get the initial angle θ of the inclinometer 0 . The invention is applicable to the fields of optical fiber grating sensing technology and engineering measurement technology.

Description

technical field [0001] The invention relates to a multi-point displacement testing method based on fiber grating sensing technology. It is suitable for the fields of fiber grating sensing technology and engineering measurement technology. Background technique [0002] During the excavation process of dams, tunnels, underground roadways, foundation pits, slopes, etc., engineering and technical personnel often need to understand the horizontal displacement of the deep part, the settlement of the adjacent ground, and its temporal and spatial evolution rules to determine the support method. And parameters to ensure the safety of engineering construction. [0003] At present, the multi-point displacement measurement devices used in deep places at home and abroad mainly include inclinometer tubes for horizontal displacement measurement and multi-point displacement gauges for testing axial deformation, and the multi-point strain sensors are connected in series to calculate the def...

AI Technical Summary

Problems solved by technology

[0003] At present, the multi-point displacement measurement devices used in deep areas at home and abroad mainly include inclinometer tubes for horizontal displacement measurement and multi-point displacement gauges for testing axial deformation, and the multi-point strain sensors are connected in series to calculate the deflection, which needs to increase the displacement of two points Boundary test, and the deep horizontal displacement test can only measure the horizontal displacement of the orifice point (single point). If the displacement test alone is used, the displacement of each point cannot be directly calculated. However, the multi-point settlement measurement device for linear distribution is still is blank

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