Displacement monitoring device and method based on optical fiber bending loss

Abstract

The invention provides a displacement monitoring device and method based on optical fiber bending loss. The displacement monitoring device comprises a displacement collection and conversion assembly,a measuring assembly which is connected with the output end of the displacement collection and conversion assembly and a data processor which calculates the displacement amount of a to-be-measured target according to measurement data of the measuring assembly. The displacement collection and conversion assembly converts the displacement amount of the to-be-measured target to be measurable within ameasurable range of optical fiber bending loss, that is to say, the large displacement of the to-be-measured target is converted into small displacement with the measuring range of optical fiber bending loss, thus the displacement amount of the to-be-measured target is obtained through a method of measuring optical fiber bending loss and calculating the displacement of the to-be-measured target,and therefore, the displacement amount of the to-be-measured target is monitored. The displacement monitoring device and method have the advantages of being high in precision and good in economic benefit; the displacement monitoring device can measure the displacement amount in the direction opposite to the direction of tension or pressure on the to-be-measured target on the basis of optical fiberbending loss, and the limitation that an existing optical fiber displacement sensor can only measure single-direction displacement is broken through.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a displacement monitoring device and method based on optical fiber bending loss. Background technique [0002] Displacement is one of the most important monitoring physical quantities in the field of structural health monitoring, and plays an important role in the monitoring of cracks and sliding in major structures such as civil engineering and water conservancy and hydropower projects. As we all know, excessive deformation will cause damage or instability of the structure, affect the normal use of the structure, and even cause safety accidents. Traditional displacement sensors mainly include resistive, capacitive and electromagnetic, etc. These sensors are easily disturbed by the electromagnetic environment in practical applications. In contrast, optical fiber displacement sensors have the advantages of strong anti-electromagnetic interference, good electrical insulation, corrosion resi...

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Problems solved by technology

However, the preparation process of these displacement sensors is relatively complicated, and usually adopts the method of wav

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