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Optical heterodyne detection of pulsed ultrasonic pressures

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3 Author(s)
Jia, X. ; Paris Univ., France ; Quentin, G. ; Lassoued, M.

An optical heterodyne interferometer was used for measuring short ultrasonic pulses in fluids. The optical phase shift of the probe beam, proportional to the acoustic pressure integrated along the light path, was demodulated quantitatively by electronic processing. The detection sensitivities of 10/sup -3/ (Pa/ square root Hz) in water and 10/sup -4/ (Pa/ square root Hz) in air were deduced. The experimental results obtained in water as well as in air show that this optical heterodyne technique offers a very sensitive way of measuring ultrasonic pressures in the low megahertz range even for very low pressures.<>

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Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:40 ,  Issue: 1 )