Study on cavitation sensor with hydrothermally deposited lead zirconate titanate film-Effect of integration range of BIV on the measured results

We developed small cavitation sensor with longer lifetime by the deposition of a hydrothermally synthesized lead zirconate titanate film on the outer surface of a hollow cylindrical Ti pipe. Our sensor could be applied to the measurement of sound pressure in a high-intensity ultrasound field with acoustic cavitation longer than 150 hours. We investigated the effects of integration range on the BIV (Broad band Integrated Voltage) images which were measured in a water vessel of a sonoreactor. We measured the spatial distribution of the cavitation generated in the water vessel of the 150 kHz sonoreactor by using our sensor. We estimated the spatial distribution of BIV calculated from the output signal of our sensor in various frequency ranges. Fundamental and harmonic components included in the driven ultrasound signal in the water vessel of the sonoreactor were decreased and disappeared sufficiently in the frequency range higher than 1 MHz. We reconstructed the images of spatial distribution of BIV with various integration ranges like 50 kHz-10 MHz, 100 kHz-10 MHz, 1 MHz-10 MHz. It was found that the spatial distribution image of BIV obtained in frequency range of 1 MHz-10 MHz was more similar to sonochemical luminescence image than that of other frequency ranges.