Fiber bragg grating strain distribution reconstruction method based on dynamic adaptive particle swarm algorithm

Abstract

The invention provides a fiber bragg grating strain distribution reconstruction method based on a dynamic self-adaptive particle swarm algorithm, and non-uniform strain can be more accurately reconstructed. The method comprises the following steps of 1, constructing a sensor device for measuring strain distribution and for acquiring an original signal of the strain distribution, wherein the sensordevice comprises two fiber bragg gratings which are arranged side by side, one fiber bragg grating is a uniform fiber bragg grating, and the other fiber bragg grating is a chirped fiber bragg grating; 2, installing the sensor device on a measured object with the need of strain measurement, 3, respectively emitting light sources for detection into the two optical fiber gratings in the step 1 and then acquiring reflection spectra corresponding to the two optical fiber gratings in real time through a spectrograph; and 4, performing strain distribution reconstruction on the reflection spectrum inthe step 3 by using the dynamic adaptive particle swarm algorithm and displaying a result through a computer.

Description

technical field [0001] The invention relates to a strain distribution reconstruction method applied to an optical fiber grating strain sensor, in particular to an optical fiber grating strain distribution reconstruction method based on a dynamic self-adaptive particle swarm algorithm. Background technique [0002] Fiber Bragg grating is a micro-optical component that has developed rapidly in recent decades. Fiber sensor technology is a new application research field of fiber Bragg grating. Fiber Bragg grating can be made into sensors for measuring parameters such as stress, strain and temperature. This new type of sensor has good stability, reliability, insensitivity to electromagnetic waves, small size, suitable for use in high temperature, corrosive or dangerous environments, and a series of advantages such as information transmission and sensing. , has a very wide range of applications in geodynamics, spacecraft and ship navigation, civil engineering structures, power ind...

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Problems solved by technology

[0005] In response to the above problems, some solutions have been proposed in the prior art. For example, the patent application number is: application number 201510180413.7, and the name is: an invention patent of a FBG non-uniform strain reconstruction method using a group algorithm. A method using The method of reconstructing non-uniform strain by FBG, this method uses the transmission matrix method to simulate the reflection spectrum under non-uniform strain distribution, but only uses FBG for measurement, it is difficult to apply to the strain reconstruction of non-monotonic distribution, and the application occasions are limited

[0006] In summary, there is currently a lack of an algorithm-based reconstruction method for FBG strain distribution that can more accurately reconstruct non-uniform strain

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