Atmospheric variable compensation method and system for use with

Details Atmospheric variable compensation method and system for use with Atmospheric variable compensation method and system for use with

1986-09-18

1988-04-05

Chapman, John

Measuring and testing

Vibration

By mechanical waves

367 99, 367902, 209590, G01S 1536, B07C 534

Patent

active

047350881

ABSTRACT:
An acoustic inspection system includes acoustic transducers to transmit and receive continuous acoustic waves at a constant frequency. Changes in phase and/or amplitude of acoustic waves reflected at different times from a fixed reference target through an isothermal transmission medium are detected. The temperature of the acoustic transmission path is controlled in response to the detected phase changes to maintain the wavelength of acoustic waves constant independent of changes in humidity and barometric pressure.

REFERENCES:
patent: 3438493 (1969-04-01), Goble
patent: 3818425 (1974-06-01), Peynaud et al.
patent: 4287769 (1981-09-01), Buckley
patent: 4576286 (1986-03-01), Buckley et al.
patent: 4581726 (1986-04-01), Makino et al.

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