Abstract
The design considerations of a new type of piezoelectric ceramic transducer for transmitting and receiving ultrasonic waves in air have been reported. This transducer contains a bilaminar assembly consisting of a piezoelectric ceramic disc and a metallic plate which oscillates in flexural mode. This bilaminar assembly mounted at its nodal circle can be designed to operate at a fixed frequency in the range of 25 to 50 kHz. The constructional details and the working of the transducer have also been given. The resonant frequencies f_exp observed experimentally for transducers having good transmitting and receiving sensitivities are found to be in good agreement with the values f_cal derived from theoretical considerations. This closed-type transducer is rugged and compact and can be employed with advantage in several indoor as well as outdoor uses in automation, sensing and remote control applications.References
[1] F. MASSA, Ultrasonic transducers for use in air, Proc. IEEE, 53, 1363 (1965).
[2] V. N. BINDAL, Indian Patent No. 116564, 1968.
[3] V. N. BINDAL, Ultrasonic transducer for automation, sensing and remote control applications, Research and Industry, 21, 80 (1976).
[4] V. DOMARKAS, A. MASONIS, A. PETRAUSKAS, New type of electroacoustic transducers for gases, Proceedings Ultrasonic International 1977, 180.
[2] V. N. BINDAL, Indian Patent No. 116564, 1968.
[3] V. N. BINDAL, Ultrasonic transducer for automation, sensing and remote control applications, Research and Industry, 21, 80 (1976).
[4] V. DOMARKAS, A. MASONIS, A. PETRAUSKAS, New type of electroacoustic transducers for gases, Proceedings Ultrasonic International 1977, 180.
