Clarification of sound radiation mechanism for airborne ultrasonic transducer

• Published in: Acoustical Science and Technology Vol. 30; no. 6; pp. 404 - 409
• Main Authors: Sakai, Shinichi, Shiozawa, Yasuo, Toi, Takeshi
• Format: Journal Article
• Language: English
• Published: Tokyo ACOUSTICAL SOCIETY OF JAPAN 01.01.2009; Acoustical Society of Japan; Japan Science and Technology Agency
• Subjects: Acoustics; Exact sciences and technology; Field analysis; Fundamental areas of phenomenology (including applications); Physics; Solid mechanics; Structural and continuum mechanics; Transduction; acoustical devices for the generation and reproduction of sound; Ultrasonic transducer; Vibration analysis; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...); 43.35.Ae; Field analysis; Piezoelectric sensor; Vibration; Air coupling; Pressure sensor; Optimization; 43.38.Fx; Long distance propagation; Acoustic radiation; Vibrational mode; Ultrasonic transducer; Structural analysis; Vibration analysis
• ISSN: 1346-3969; 1347-5177
• DOI: 10.1250/ast.30.404

An airborne ultrasonic transducer is generally required to generate high sound pressure in order to realize precise detection and long-range measurement. The purpose of this study is to analyze the vibration mechanism of a piezoceramic transducer and to indicate guidelines for the optimum structure in order to increase the pressure amplitude. We focus our attention on the peak appearance in the pressure response of the transducer. We then clarify, experimentally and numerically, the sound radiation mechanism from vibrational and acoustical points of view. In this report, we present newly observed vibration modes with two peaks and promising schemes for efficiently increasing the sound pressure amplitude.