Non contact measurement of vibration using airborne ultrasound

Matar, Olivier Bou; Remeniéras, Jean-Pierre; Roncin, A.; Patat, F.

doi:10.1109/ultsym.1996.584070

Cited by 9 publications

(3 citation statements)

References 23 publications

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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%

Cancellation of parametric-effect-induced error in airborne ultrasound Doppler velocimetry

Nakamura

Ueha

2005

Acoust. Sci. & Tech.

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A non-contact vibration measuring technique based on ultrasonic Doppler effect is studied. Two effects induce phase modulation on the received ultrasound signal, which are Doppler effect and nonlinear parametric effect. With the increasing of vibrating frequency, the phase variation due to parametric effect is getting greater and greater. In this paper, by measuring the acoustic pressure generated by the low frequency vibration, the parametric effect is taken into account for estimating the vibrating velocity. The results show that it is better than the method of only taking account of the Doppler effect especially as the vibrating frequency increases. For example, for a vibrating body of diameter 10 cm at frequency of 1.5 kHz, the error of velocity measurement with parametric-effect-compensation is getting less than one half of that without compensation.

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Section: Parametric Effectmentioning

confidence: 99%

Cancellation of parametric-effect-induced error in airborne ultrasound Doppler velocimetry

Nakamura

Ueha

2005

Acoust. Sci. & Tech.

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“…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%

Transient surface velocity measurements in a liquid by an active ultrasonic probe

Casula

Royer

1998

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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A high sensitive ultrasonic method for measuring the surface velocity in a liquid is described. This method is based on the detection of the phase of a high frequency continuous ultrasonic wave (probe beam) reflected from the moving surface. The analysis shows that the main phenomenon is the interaction, through the acoustic nonlinearity parameter B/A of the fluid, between the reflected carrier wave and the low frequency pressure wave transmitted by the moving surface in the liquid. This interaction produces a phase-shift of the carrier proportional to the surface velocity and to the time delay undergone by the probe beam. Results of experiments carried out in water with a 30-MHz focused transducer probe are in good agreement with the analysis. Surface velocity smaller than 0.04 mm/s (i.e., mechanical displacements down to 3 pin) can be detected in a 5 MHz bandwidth. Lateral resolution of 0.5 mm has been achieved. Compared to optical techniques, this method has the advantages of compactness and of a low sensitivity to surface roughness.

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“…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%

Design of Ultrasonic Gas Temperature Measurement System with Humidity Self-Correction

Yao

Guan

Dong

2011

AMR

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In the ultrasonic gas temperature measurement system, the principle is that the velocity of sound in gas is a function of temperature. But because the propagation speed of ultrasonic wave can be easily affected by humidity, the accuracy of the gas temperature measurement will be affected too. This dissertation will implement the ultrasonic gas temperature measurement system with humidity correction suitable for all kinds of environment humidity. This type of ultrasonic technique is a highly efficient algorithm with the advantages of both time-of-flight method and phase shift method. And the system is realized with a single-chip microcomputer-based with a relative humidity/water vapor pressure meter. The main advantages of this ultrasonic temperature measurement system are high resolution, using narrow-bandwidth ultrasonic transducer of low cost and ease of implementation.

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Non contact measurement of vibration using airborne ultrasound

Cited by 9 publications

References 23 publications

Cancellation of parametric-effect-induced error in airborne ultrasound Doppler velocimetry

Cancellation of parametric-effect-induced error in airborne ultrasound Doppler velocimetry

Transient surface velocity measurements in a liquid by an active ultrasonic probe

Design of Ultrasonic Gas Temperature Measurement System with Humidity Self-Correction

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