1996 IEEE Ultrasonics Symposium. Proceedings
DOI: 10.1109/ultsym.1996.584070
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Non contact measurement of vibration using airborne ultrasound

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Cited by 9 publications
(3 citation statements)
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“…Physically the phase modulation of a high-frequency wave is caused by the variation of the propagation velocity of points of its profile in the field of the low-frequency acoustic wave. The variation of the propagation velocity in the interaction zone depends on two factors [2] [3]: The first is the excess pressure caused by low frequency sound.…”
Section: Parametric Effectmentioning
confidence: 99%
“…Physically the phase modulation of a high-frequency wave is caused by the variation of the propagation velocity of points of its profile in the field of the low-frequency acoustic wave. The variation of the propagation velocity in the interaction zone depends on two factors [2] [3]: The first is the excess pressure caused by low frequency sound.…”
Section: Parametric Effectmentioning
confidence: 99%
“…This characteristic is limited by the bandpass of the concave transducer (12 MHz) and by the mismatch between the spherical wavefronts of the carrier beam and the plane wavefronts of the low frequency transmitted wave. This effect, linked to the angular directivity of the parametric interaction [5], [13], reduces the efficiency of the active probe as the frequency increases. At time t and abscissa x (Fig.…”
Section: Directivity and Bandpassmentioning
confidence: 99%
“…The techniques of temperature measurement using ultrasonic in gas include the time-of-flight (TOF) technique [1,2], single-frequency continuous wave phase shift [3], and two frequency continuous wave method [4,5]. Using the TOF to measure the temperature, the system errors are primarily due to amplitude degradation of the received signal, and uncertainty in the environment variables such as humidity and gas pressure.…”
Section: Introductionmentioning
confidence: 99%