A random forest-based method for axial stress estimation of long-period fiber gratings

An axial stress, fiber grating technology, used in the measurement of force, instruments, complex mathematical operations, etc.

Active Publication Date: 2021-04-23
JINLING INST OF TECH
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Problems solved by technology

The invention provides a method for estimating the axial stress of long-period fiber gratings based on random forests, and solves the problem of measuring axial stress by long-period fiber grating sensors

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  • A random forest-based method for axial stress estimation of long-period fiber gratings
  • A random forest-based method for axial stress estimation of long-period fiber gratings
  • A random forest-based method for axial stress estimation of long-period fiber gratings

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Embodiment Construction

[0041] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0042] The invention provides a method for estimating the axial stress of a long-period optical fiber grating based on a random forest, which is used for measuring axial strain by a long-period optical fiber grating sensor. Its purpose is to combine the excellent anti-overfitting ability of random forest to improve the ability of long-period fiber grating sensors to measure stress. The overall algorithm principle flow process of the present invention is as figure 1 shown, including the following steps:

[0043] Step 1: Build an experimental platform for axial stress measurement of long-period fiber gratings, use the experimental platform to detect the transmission spectra of long-period fiber gratings under different axial stresses, and preprocess the collected data;

[0044] In step 1, the experimental platform for axial stress measurement of...

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Abstract

The invention relates to a method for estimating the axial stress of long-period fiber gratings based on random forests. First, the transmission spectrum of the sample to be tested is measured through the built-up long-period fiber grating axial stress measurement experimental platform, and then the resonance wavelength characteristics of the transmission spectrum are extracted. , and finally combine the random forest algorithm to calculate the axial stress of the tested sample, and realize the effective estimation of the axial stress of the long-period fiber grating.

Description

technical field [0001] The invention relates to the field of long-period fiber grating strain sensing, in particular to a random forest-based long-period fiber grating axial stress estimation method. Background technique [0002] The long-period fiber grating is formed by exposing the hydrogen-loaded germanium-doped fiber to the periodic amplitude mask plate irradiated by ultraviolet light, resulting in the periodic modulation of the refractive index of the fiber core. Long-period fiber gratings can couple the core mode of the fiber to the cladding mode that is propagating in the same direction, causing transmission loss at a specific wavelength. Wide range of applications, such as: temperature, stress, gas concentration, refractive index, band-stop filtering, gain flattening, and system tuning, etc. Stress is one of the important basic detection parameters in engineering applications, such as rail stress, strip steel stress, dynamic loading of building structures, etc. The...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10
CPCG01L1/242
Inventor 胡兴柳司海飞方挺王彦沈浩
Owner JINLING INST OF TECH
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