Experimental evaluation of high-intensity ultrasound source system using acoustic waveguide for calibration of hydrophone

• Published in: Japanese Journal of Applied Physics Vol. 56; no. 7S1; pp. 7 - 14
• Main Authors: Igarashi, Shigeru, Morishita, Takeshi, Uchida, Takeyoshi, Takeuchi, Shinichi
• Format: Journal Article
• Language: English
• Published: The Japan Society of Applied Physics 01.07.2017
• ISSN: 0021-4922; 1347-4065; 1347-4065
• DOI: 10.7567/JJAP.56.07JF19

In recent years, the use of high-intensity ultrasound equipment has increased in both medical and industrial fields. Consequently, we proposed a high-intensity ultrasound source system using a cylindrical acoustic waveguide for the development of an ultrasound source for the absolute calibration of the receiving sensitivity of hydrophones. We fabricated the experimental ultrasound source system using the cylindrical acoustic waveguide with particular considerations of the material selection and cutting methods to be used. The measured spatial distribution of acoustic pressure generated by our fabricated ultrasound source almost coincides with the results obtained by numerical simulation. In particular, the measured and simulated −6 dB main beam widths agreed within 15%. The linearity was measured using ultrasound waveforms with applied peak-to-peak voltages within the linear range of the power amplifier. Nonlinear phenomena were observed for the measured acoustic pressures of about 130 kPa or more.