Abstract
The development of a liquid-immersible, megahertz-range, electrostatic acoustic transducer (ESAT) was previously reported [Cantrell etal., Rev. Sci. Instrum. 50, 31–33 (1979)]. The transducer basically consists of a thin conductive membrane stretched over an electrically isolated cylindrical electrode recessed approximately 10 μm from the membrane inner surface. A model recently developed to explain the frequency roll-off characteristics of the ESAT resulting from liquid-membrane coupling [J. H. Cantrell and W. T. Yost, Rev. Sci. Instrum. 60, 487–488 (1989)] together with a Thevenin equivalent substitutional circuit scheme permits absolute measurement of ultrasonic displacement amplitudes in the submicron range to be made with the ESAT. The geometry of the system allows straightforward correction for diffraction effects. ESAT calibration of ultrasonic tone bursts generated by broadband piezoelectric transducers immersed in water is reported. A fast Fourier transform-based technique using short unipolar voltage excitation for piezoelectric transducer calibration is discussed. [Work supported by NASA Office of Technology Utilization.]
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