Piezoelectric power harvesting from chirps and mating swiftlets attraction sound

摘要

The voltage measurement from piezoelectric disk (PZT) transducer is proposed in this paper. The attraction sound that has been used in the swiftlet farming industries was emitted at three different levels. The PZT was placed inside and outside the speaker to identify maximum power to produced high impulse voltage. The swiftlets sound was recorded using Avisoft software and analysed in Matlab. The sound was dividing into seven frames and it spectrum was plotted using Fast Fourier Transform (FFT) function to acquire the magnitude and frequency information. A Strip chart used to log and graph values acquired from PZT for 100 Hz sampling rate. The impulse response for each sample was saving in excel format and analysed in Matlab software. The finding showed, the voltage acquire from different type of swiftlets sound is significant different. In addition, the voltage generated from two PZT location also showed significant different. The reason can be highlight here is voltage generated by PZT is depending on the power of sound transmitted. The higher power sound transmitted the higher voltage generated from PZT.