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  • THE IMPROVEMENT AND EVALUATION OF A LASER INTERFEROMETER FOR THE ABSOLUTE MEASUREMENT OF ULTRASONIC DISPLACEMENTS IN THE FREQUENCY RANGE UP TO 15 MHZ

Abstract

This report describes the application of a laser interferometer to the absolute calibration of hydrophones in the frequency range 0.5 to 15 MHz. The interferometer, previously developed and improved at AERE Harwell, has now been assessed in terms of its performance characteristics. The optimum experimental arrangement and method of calibration has been defined and corrections for various effects which influence the measurement have been studied experimentally and theoretically. The reproducibility of the method is approximately 1% and the estimated systematic uncertainty ranges from 2.1% at 0.5 MHz to 6.3% at 15 MHz. A hydrophone has been calibrated using the interferometer and using two other methods, and the results are in agreement to within the estimated uncertainties

Additional information

Authors: BACON D R NATIONAL PHYSICAL LABORATORY, TEDDINGTON, MIDDLESEX (UK), NATIONAL PHYSICAL LABORATORY, TEDDINGTON, MIDDLESEX (UK)
Bibliographic Reference: EUR 10910 EN (1986) MF, 78 P., BFR 150, BLOW-UP COPY BFR 390, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989126012400 / Last updated on: 1989-03-01
Category: PUBLICATION
Available languages: en
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