Displacement monitoring device and method based on optical fiber bending loss

Abstract

The present invention provides a displacement monitoring device and method based on optical fiber bending loss, comprising: a displacement acquisition and conversion component, a measurement component connected to the output end of the displacement acquisition and conversion component, and calculating the displacement of a target to be measured according to the measurement data of the measurement component Through the displacement conversion component, the displacement of the target to be measured is converted into the measurable range of the fiber bending loss, that is, the large displacement of the target to be measured is converted into a small displacement within the range of the optical fiber bending loss, thus The displacement of the object to be measured can be obtained by measuring the bending loss of the optical fiber and the calculation method of the bending loss of the optical fiber and the displacement of the object to be measured, thereby realizing the monitoring of the displacement of the object to be measured. The invention has high precision and good economic benefits; based on the bending loss of the optical fiber At the same time, the monitoring device can simultaneously measure the relative opposite displacement of the target to be measured under tension or pressure, breaking through the limitation that the existing optical fiber displacement sensor can only measure displacement in one direction.

Description

Technical field [0001] The present invention relates to a sensor, and more particularly, to a displacement of the optical fiber monitoring apparatus and method based on bending losses. Background technique [0002] Displacement is one of the most important monitoring structural health monitoring of physical quantities, such as displacement of the crack and slip monitoring of major structural and civil engineering projects in water conservancy and hydropower plays an important role. As we all know, too much can cause damage or deformation of structural instability, affecting the normal use of the structure, and even lead to accidents. Conventional displacement sensor includes a resistive, capacitive and electromagnetic like, these sensors are susceptible to interference electromagnetic environment in practical application. In contrast, the optical fiber displacement sensor having anti-electromagnetic interference, electrical insulation, corrosion resistance, high flexibility, smal...

AI Technical Summary

Problems solved by technology

However, the preparation process of these displacement sensors is relatively complicated, and usually adopts the method of wavelength modulation, which needs to be demodulated by a relatively expensive spectrometer, and the test cost is relatively high

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