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- W2065156733 abstract "A reliable semiautomatic pulse system for determining the velocity and absorption of ultrasound in liquids, over the frequency range from 1–200 MHz, includes a motor-driven lead screw that displaces the transmitting transducer relative to the receiving transducer. The amplitude of a selected received pulse is detected and fed to a chart recorder whose output is linearly related to the logarithm of the pulse amplitude. The chart recorder and the motor are synchronized to the line frequency and, therefore, the piston displacement is linearly related to the time axis of the chart paper. The ultrasonic velocity is determined from an interference pattern produced by employing either a double pulse or a pulse-CW configuration, which permits accurate characterization of the tracking between the transducer and the recorder-pen position. The velocity in aqueous materials has been determined with a precision of ±0.3%, limited by the linearity of the lead screw. The ultrasonic-absorption coefficient, over the entire frequency range considered, has a fractional standard deviation of ±0.3%. [Supported by Institute of General Medical Sciences, National Institutes of Health, U. S. Department of Health, Education, and Welfare, and Acoustic Programs, U. S. Navy, Office of Naval Research.]" @default.
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- W2065156733 date "1967-01-01" @default.
- W2065156733 modified "2023-10-18" @default.
- W2065156733 title "Semiautomatic Ultrasonic‐Velocity and Absorption Instrumentation for Liquid Media" @default.
- W2065156733 doi "https://doi.org/10.1121/1.2143616" @default.
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