Topic
Acoustic interferometer
About: Acoustic interferometer is a research topic. Over the lifetime, 1493 publications have been published within this topic receiving 19355 citations.
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01 Jan 1962
TL;DR: In this paper, large single crystals of benzene (C6H6) were aligned by an optical method and pulsed with ultrasonic waves at a frequency of approximately 10 megacycles per second using quartz crystal transducers.
Abstract: : Large single crystals of benzene (C6H6) were aligned by an optical method The aligned crystals were pulsed with ultrasonic waves at a frequency of approximately 10 megacycles per second using quartz crystal transducers The velocity of the ultrasonic waves was measured by comparing the echo transit time with that of simultaneously generated waves moving through a variable length path in a medium in which the velocity of sound was known precisely Velocities of longitudinal and transverse waves along each of the principal axes of the orthorhombic crystal were used to compute the main diagonal terms of the C sub ij matrix The off-diagonal terms were then determined by velocity measurements along arbitrarily selected directions Velocity measurements were made and the elastic constants computed over the temperature range 170 K to 250 K Absorption in the crystal was measured over the same temperature range for each of the directions used for velocity measurements The absorption was determined to be aelotropic
2 citations
TL;DR: In this paper, an interferometer and a procedure for measuring the velocity and absorption coefficient of ultrasound in light and heavy water close to the critical point were developed, and the interferometers were used to measure the absorption coefficient and velocity of ultrasound.
Abstract: An interferometer and a procedure for measuring the velocity and absorption coefficient of ultrasound in light and heavy water close to the critical point are developed.
2 citations
2 citations
Patent•
15 Mar 2006
TL;DR: In this paper, an ultrasonic transducer is introduced into the liquid and at least one resonance frequency of the ultrasonic Transducer (1) is measured in the liquid, and the acoustic impedance of the liquid (2) is determined from the measured resonance frequencies.
Abstract: The invention relates to a method for measuring the acoustic impedance of a liquid (2), especially for determining the density of a liquid (2). According to the invention, an ultrasonic transducer (1) is introduced into the liquid (2), at least one resonance frequency of the ultrasonic transducer (1) is measured in the liquid (2), and the acoustic impedance of the liquid (2) is determined from the measured resonance frequencies. The inventive method enables the acoustic impedance of a liquid to be precisely determined, and to determine the density of the liquid with high precision in conjunction with an ultrasonic transit-time measurement.
2 citations
TL;DR: In this paper, it was shown that the critical value of the relative characteristic impedance above which the attenuation of the sound waves becomes sharp depends upon the nature of the gas and the ionic charge.
Abstract: The electron temperature and the velocity of sound waves in a Lorentz plasma have been determined by transmitting sonic signals in the range 4 to 40 kc/s through it. It has also been observed that although the reflections of the sound waves at the plasma—air interfaces occur when the relative characteristic impedance of plasma with respect to air exceeds unity, the reflected or transmitted pressure amplitudes do not change appreciably until the relative characteristic impedance exceeds the value (Z + 1)1/2, where Z is the charge of the ion. Thus the critical value of the relative characteristic impedance above which the attenuation of the sound waves becomes sharp depends upon the nature of the gas and the ionic charge. This method is also useful for exploring the pre-glow/Townsend discharge condition of the ionized media. The plasma parameters may be measured even in very weak ionizations where other existing techniques, viz. the microwave/ultrasonic probing or spectroscopic methods, are not suited. The ...
2 citations