Capacitive acoustic wave detector and method of using same

Details Capacitive acoustic wave detector and method of using same Capacitive acoustic wave detector and method of using same

1994-09-27

1996-10-22

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73644, 73654, 73579, 324662, G01N 2912

Patent

active

055665730

ABSTRACT:
A capacitor having two substantially parallel conductive faces is acoustically coupled to a conductive sample end such that the sample face is one end of the capacitor. A non-contacting dielectric may serve as a spacer between the two conductive plates. The formed capacitor is connected to an LC oscillator circuit such as a Hartley oscillator circuit producing an output frequency which is a function of the capacitor spacing. This capacitance oscillates as the sample end coating is oscillated by an acoustic wave generated in the sample by a transmitting transducer. The electrical output can serve as an absolute indicator of acoustic wave displacement.

REFERENCES:
patent: 2677270 (1954-05-01), Sanderson
patent: 3577774 (1971-05-01), Steffens et al.
patent: 3930405 (1976-01-01), Renken, Jr.
patent: 4246793 (1981-01-01), Fairand et al.
patent: 4418573 (1983-12-01), Madigosky et al.
patent: 4451780 (1984-05-01), Ogasawara
patent: 4649750 (1987-03-01), Cantrell, Jr. et al.
patent: 5345825 (1994-09-01), Lee et al.

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