Hollow cylindrical titanium pipe cavitation sensor using hydrothermal synthesized lead zirconate titanate poly-crystalline film as piezoelectric element

摘要

Two types of cavitation sensors with different sizes of inner diameter of 18 mm, height of 7mm and inner diameter of inner diameter of 4.8 mm, height of 1mm were developed with hydrothermally synthesized PZT on the outer surface of the hollow Ti cylindrical pipe in this study. Output signal from the fabricated cavitation sensors were analyzed in frequency domain with changing applied voltage to the Langevine type transducer of our ultrasound exposure system (sonoreactor) . Frequency components included in the output signal from the cavitation sensor were measured as the cavitation signal in order to distinguish from the harmonic components by nonlinear propagation in water and those by acoustic cavitation. Broadband integrated voltage (BIV) can be calculated by integrating harmonic components included in the output signal from the cavitation sensor. The spatial distributions of BIV were measured in the water vessel in a sonoreactor by scanning our cavitation sensors in the water vessel. It could be confirmed that the measured spatial distributions of BIV had similar patterns with sonochemiluminescence (SCL) pattern, sonoluminescence (SL) pattern and B-mode images obtained with an ultrasound diagnostic equipment. Furthermore, it could be confirmed that disturbance of the reaction field by cavitation sensor was suppressed by reducing the size of cavitation sensor.