Local displacement measuring device based on FBG sensor

Abstract

The invention relates to a local displacement measuring device based on an FBG (Fiber Bragg Grating) sensor. The local displacement measuring device based on an FBG sensor comprises an FBG sensor, a fiber, an elastomer, and a fiber grating signal processor. Under the working condition, when a measured object shifts, deformation of the structure can cause deformation of the elastomer so as to cause deformation of the fiber grating; the deformation of the fiber grating can be obtained through the fiber grating signal processor; and deformation of the measured object can be obtained through further inverse computation by means of a formula so as to realize precision measurement of the local displacement of the measured object.

Description

technical field [0001] The invention relates to a device for measuring local displacement on the surface of a solid (such as soil, rock, concrete, etc.) by using an FBG sensor, in particular to a device for local displacement using the principle of the FBG sensor. Background technique [0002] The traditional electromagnetic displacement meter 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. Therefore, the ...

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Problems solved by technology

[0002] The traditional electromagnetic displacement meter 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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