Sound and Ultrasound Waves

Krasilnikov, V. A.; Overbeck, C. J.

doi:10.1119/1.1971185

Cited by 9 publications

(6 citation statements)

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“…The ratio of the tramverse dimensions of the cubic specimens to the experimental wavelengths was 5-14, and therefore in these cases the measured velocity was the velocity of propagation of the longitudinal wave in the solid rock, V s [4]. The ends of the specimens were polished.…”

mentioning

confidence: 99%

Velocity of propagation of elastic waves in rock, in relation to natural factors

Mitin¹,

Timofeev²

1970

Soviet Mining Science

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IN ROCK, IN RELATION TO NATURAL FACTORS V. D. Mittn and ~. I. Timofeev UDC 622.235:534.231 Various authors [1 -3, et al.] have published work on the velocity of propagation of elastic waves in rocks; however, this topic has not been studied in field (pit) conditions in the Donbass. In this connection, research has been carried out to determine the velocity of propagation of elastic longitudinal waves in rocks in the Donbass in relation to certain natural factors. The aim of the work was to give a method of estimating the elastic characteristics of the rocks on the basis of data on their densities and conditions of occurrence.

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mentioning

confidence: 99%

Velocity of propagation of elastic waves in rock, in relation to natural factors

Mitin¹,

Timofeev²

1970

Soviet Mining Science

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“…Accuracy of the measurement depends on the knowledge of c and the correct estimation of T 0 . The sound velocity shows an almost linear dependence with temperature (2) which can be easily compensated [4].…”

Section: Introductionmentioning

confidence: 99%

“…This error could be avoided if the added delays were constant, but the amplitude changes produce deviations. To quantify this error, the echo waves can be modeled as the damped sinusoids [3,4].…”

Section: Introductionmentioning

confidence: 99%

High Accuracy Time of Flight Measurement Using Digital Signal Processing Techniques for Subsea Applications

Ashraf¹,

Qayyum²

2011

JSIP

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The techniques widely used in ultrasonic measurements are based on the determination of the time of flight (T.o.F). A short train of waves is transmitted and same transducer is used for reception of the reflected signal for the pulse-echo measurement applications. The amplitude of the received waveform is an envelope which starts from zero reaches to a peak and then dies out. The echoes are mostly detected by simple threshold crossing technique, which is also cause of error. In this paper digital signal processing is used to calculate the time delay in reception i.e. T.o.F, for which a maximum similarity between the reference and the delayed echo signals is obtained. To observe the effect of phase uncertainties and frequency shifts (Doppler), this processing is carried out, both directly on the actual wave shape and after extracting the envelopes of the reference and delayed echo signals. Several digital signal processing algorithms are considered and the effects of different factors such as sampling rate, resolution of digitization and S/N ratio are analyzed. Result show accuracy, computing time and cost for different techniques

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“…Transmitted wave: (4) where: p is the acoustic pressure, kn is the wave numbers, Cn is the velocity of sound in layer n, f is the frequency in Hz, and AI, BI ,and A2 are the real pressure amplitudes.…”

Section: Transmission Across Interfacesmentioning

confidence: 99%

“…The theory describing the transmission of longitudinal waves across an interface has been well developed [3][4][5][6][7]. Eqs.…”

Section: Transmission Across Interfacesmentioning

confidence: 99%

Modeling Through Transmission Ultrasonics for Controlling the Fusion Bonding of Composites

Tackitt

Don

Gillespie

1995

Review of Progress in Quantitative Nondestructive Evaluation

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Sound and Ultrasound Waves

Cited by 9 publications

References 0 publications

Velocity of propagation of elastic waves in rock, in relation to natural factors

Velocity of propagation of elastic waves in rock, in relation to natural factors

High Accuracy Time of Flight Measurement Using Digital Signal Processing Techniques for Subsea Applications

Modeling Through Transmission Ultrasonics for Controlling the Fusion Bonding of Composites

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