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The performance of the optical fiber pre-warning system (OFPS) is susceptible to the interference of background noise, especially in the low signal-to-noise ratio (SNR) environment. In this paper, a recognition method based on the multi-level wavelet decomposition is proposed to accurately identify the running and digging intrusion signals in OFPS under the low SNR condition. The method includes the...
This study described relative humidity (RH) sensing using a graphene/128° YX LiNbO 3 surface acoustic wave (SAW) device. The resonant frequency of the device decreased in a two-stage manner as the RH increased. For a low RH range (RH<50%), a frequency downshift of 1.38kHz per 1% RH change was observed. This was attributed to mass loading of the SAW propagation surface due to the adsorption...
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