CALIBRATION OF ULTRASONIC TRANSDUCER SENSITIVITY AND POWER BY LASER INTERFEROMETRY
The objective of this work was to demonstrate how laser interferometry can be used as a primary method for the calibration of energy and sensitivity of ultrasonic transducers or hydrophones. The sound field displacements for a number of transducers were measured in the frequency range 0.5 - 10 MHz and compared with displacements created by transducers which were calibrated by the reciprocity method. The displacements due to ultrasound are usually only a few nm. This required compensation of the interferometer signal for low frequency background vibrations of the system. Recommendations to overcome this limitation insensitivity are given, e.g.: frequency lock voltmeter and optical phase lock. In addition a method of scanning the face of a transducer is described to detect the non-uniformity of a displacement over the transducer's surface.
Bibliographic Reference: EUR 10349 EN (1985) MF, 117 P., BFR 300, BLOW-UP COPY BFR 585, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989124092900 / Last updated on: 1987-01-01
Available languages: en