The application discloses a kind of based on improved SVD's dry-type air-core reactor
optical fiber sensing
noise reduction method, and improved SVD is proposed to be applied to distributed
optical fiber sensing detection dry-type air-core reactor fault alarm
system.Establish the backscattering model of
temperature measurement system, add
Gaussian white noise and utilize traditional threshold denoising and improved SVD denoising analysis
signal-to-
noise ratio, provide theoretical basis for experiment.Under existing conditions in laboratory, collect original anti-Stokes light with temperature information and Stokes light and obtain ratio
data matrix by ratio, after remodeling
data matrix,
singular value decomposition reconstruction is carried out, then after remodeling matrix, the ratio
signal with temperature information after denoising is obtained, into two-way
demodulation formula to obtain
demodulation temperature information, finally according to
demodulation error, compare denoising effect, the present application can effectively reduce demodulation
temperature error by
noise reduction
algorithm, improve
system temperature measurement precision, compared with traditional
wavelet denoising, improve system
signal-to-noise ratio, avoid threshold selection uncertainty and other problems.