Compared with the traditional hydrophone method, the optical method has the advantages of high precision and high measurement speed. In this paper, a variety of optical detection methods of sound field are introduced. Taking optical interferometry as an example, the velocity of acoustic particles in sound field is measured by measuring the vibration of pellicle with laser vibrometer. Acoustic reflective pellicle is the key medium, and its main installation methods are placed in water and on water. The hydrophone method is used to explore the effect of sound transmitting and reflective pellicle placed in water on the performance of ultrasonic sound field. The experimental results show that the existence of surface sound transmitting pellicle has no effect on the ultrasonic sound field of focused transducer.
Focused ultrasound transducer is widely used in medical treatment instruments and equipment, which can achieve the purpose of tumor ablation through thermal, cavitation and mechanical effects under high power and high sound intensity conditions, and precisely destroy the target tissues. The optical method based on laser interference technology has the characteristics of high precision, high resolution and high measurement efficiency for the measurement of acoustic field characteristics of the focusing transducer, while avoiding the disadvantages of hydrophone measurement under high sound intensity conditions. In this paper, the influence of the transmissive reflective film on the acoustic transmission is theoretically deduced, and the influence of the transmissive reflective film on the focal position of the focusing transducer is confirmed. Experiments are conducted to investigate the change of acoustic pressure of the transmissive reflective film on the focus of the focusing transducer at different power conditions and different positions of the focusing transducer
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