Propagation delay meter

Details Propagation delay meter Propagation delay meter

1975-05-05

1977-07-26

Farley, Richard A.

Communications: electrical

Selective

Monitoring in addition to control

73560, 340 5S, 340 8FT, G01S 966

Patent

active

040386295

ABSTRACT:
For accurate measurements of the sound velocity in liquids, for example water, the propagation delay is measured between an ultrasonic wave which is emitted by a transducer and the wave which returns to the transducer upon reflection. By making the reflector spherical and disposing it at a distance from the transducer which is within 11/2 times the length of the Fresnel region of the emitted acoustic wave, a favorable ratio between the 1 .tau. and the 2 .tau. signal is obtained, which ratio can be further improved when the central portion of the reflector is slightly flattened.

REFERENCES:
patent: 2778273 (1957-01-01), Fellmeth
patent: 3184959 (1965-05-01), Suellentrop et al.
patent: 3273111 (1966-09-01), Parenti

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