Abstract
The impedance matching of spherical focused ultrasonic transducer is one of the primary factors affecting the energy utilization efficiency in focused ultrasonic flow polishing system. To realize the efficient utilization of the vibration energy of the transducer, the front matching layer structure is design to achieve the impedance matching of the transducer and the abrasive flow liquid, thereby improving the transmittance of the transducer vibration energy in the liquid, and the back-matching layer structure is used to reflect the radiated vibration energy on the back of the transducer to reduce dissipation of radiated vibration energy on the back of the transducer. Based on the acoustic impedance matching theory and Kirchhoff’s theory, the influence of the front and back impedance matching structure of spherical focused ultrasonic transducer on the focal point sound pressure is studied theoretically, and experimentally, a novel impedance matching structure for spherical focused ultrasonic transducer is proposed. The experimental results showed that the focal point sound pressure was increased by 72.03% compared with that of the traditional structure.
Highlights
Abstract:The impedance matching of ultrasonic focusing spherical transducer is one of the primary factors affecting its work efficiency in ultrasonic focusing flow polishing system
To optimize the structure of the focusing spherical ultrasonic transducer and achieve highefficiency energy output, this paper systematically studies the matching parameters of the focusing spherical transducer, analyzes the principle of front and back matching
It can be seen from the Fig. that the acoustic impedance mismatch on the back of the spherical shell in the traditional structure makes most energy consumed in the backing
Summary
In the Fig., R is the radius of curvature of the transducer, a is the opening radius of the spherical shell, b is the distance from the origin to the sphere edge, r0 is the distance from the origin of the coordinates to a point Q in the sound field, and θ is the intersection angle between r0 and Z axis; ds is the unit area on the radiating surface; R1 is the distance from the origin of the coordinates to the radiating surface; r is the distance from point Q1 to Q on the radiating surface. The sound pressure at point Q is: r. According to Huygens' theory, the sound pressure p in the Z direction of the acoustic axis can be obtained as follows[8]: p iƒρu0. In the formula, Z1,Z2,Z3 are the acoustic impedances of medium I, II, and III respectively, Zi=ρici; λ2=c2/ƒ is the wavelength in medium II; c2 is the sound velocity of medium II; ƒ is resonance frequency
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