Reduction of Measurement Time in BOTDA Sensors Using WaveletShrinkage

摘要

A new method based on wavelet shrinkage is presented showing decreased measurement time for Brillouin optical time-domain analysis (BOTDA) sensors. In BOTDA sensors, the data acquired from measurements is contaminated with multiple sources of noise and requires enhancement in order to extract the Brillouin gain spectrum (BGS) and find the strain and temperature. Conventional BOTDA sensors use the very slow ensemble averaging technique which requires many acquisitions of each time-domain waveform. In this paper, we enhance time-domain waveforms using wavelet shrinkage before applying ensemble averaging. This modification yields a 92% reduction in the number of waveform acquisitions needed for a given measurement accuracy. Experimental results confirm the accuracy of the measurement based on wavelet shrinkage and show that the proposed sensor has one of the shortest measurement times amongst BOTDA sensors.