FU Hua, HU Bing. Fibre-optic sensor system for methane based on dual-wavelength stability technology[J]. 2008, 27(12): 33-35. DOI: 10.13873/j.1000-97872008.12.018.
In view of complex and changeable background noise in coal mines exploitation
the key question is how to extract the effective AE signal.Improved AE sensor dual-wavelength stability technology and the wavelet multi-criterion analysis have great time-frequency-domain and localization characteristic
by carrying on time-frequency analysis procession to the wavelet coefficient
and partial noise is eliminated by wavelet restructing and the threshold technology
denoising procession is carried on to restructing signal
the effective AE signal is extracted.The result indicates that this method is used to enhance signal-to-noise ratio of the AE signal effectively and achieve the denoising aim.