Method of determining sound propagation

Details Method of determining sound propagation Method of determining sound propagation

1981-12-28

1984-10-30

Wise, Edward J.

Boots, shoes, and leggings

73579, G01P 500

Patent

active

044803133

ABSTRACT:
A method of and an apparatus for determining sound propagation speed in a medium which is subject to variations in this speed. A measuring tube containing the medium is energized by a loudspeaker (ultraacoustic transducers) with a controllable energizing frequency in resonance with the measuring tube containing a column of the medium to be evaluated. The resonant output frequency is detected and modulated with a low frequency signal and the mean value of the modulated output signal is formed and counted. For a predetermined count, the elapsed time is measured and from this value the propagation velocity is calculated.

REFERENCES:
patent: 2758663 (1956-08-01), Snavely
patent: 3009104 (1961-11-01), Brown
patent: 3697936 (1972-10-01), Zacharias, Jr. et al.
patent: 4303853 (1981-12-01), Thalmann

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