Partial displacement measurement method based on fiber grating sensor

Abstract

The invention provides a partial displacement measurement method based on a fiber bragg grating sensor. The method comprises the steps of elastomer structure and size selecting, FBG sensor mounting and fixing, and calculating of the local displacement of a measured object. According to the main principle, when the measured object is compressed, the deformation of the measured object leads to the deformation of an elastomer, and a fiber grating deforms. According to the invention, a formula shows that a unique corresponding formula is provided for the deformation of the grating and the local displacement of the measured object; the deformation of the measured object can be acquired; and the local displacement of the measured object can be precisely measured.

Description

technical field [0001] The invention relates to a method for measuring local displacement of a solid surface by using a fiber grating sensor, in particular to a method for measuring local displacement of a solid surface by using the principle of an FBG sensor. Background technique [0002] Traditional solid surface local displacement measurement uses electromagnetic displacement meters, which can measure the displacement between the upper and lower surfaces of the measured object, but it is difficult to accurately measure the local strain and deformation in the middle of the measured object on both sides. However, the local small displacement will affect the calculation of the mechanical properties of the measured object. For example, the mechanical properties of the local small strain of the solid are related to the calculation of the deformation of the adjacent buildings caused by the excavation of the foundation pit, and it will also affect the settlement caused by the tun...

AI Technical Summary

Problems solved by technology

[0002] The traditional measurement of local displacement on a solid surface uses an electromagnetic displacement meter, which can measure the displacement between the upper and lower surfaces of the measured object, but it is difficult to accurately measure the local strain and deformation in the middle of the measured object on both sides.

However, the local small displacement will affect the calculation of the mechanical properties of the measured object. For example, the mechanical properties of the local small strain of the solid are related to the calculation of the deformation of the adjacent buildings caused by the excavation of the foundation pit, and it will also affect the settlement caused by the tunnel excavation. Calculation, etc.

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