Piezoelectrically driven transducer for electron work function a

Details Piezoelectrically driven transducer for electron work function a Piezoelectrically driven transducer for electron work function a

1981-09-14

1983-10-11

Shoop, William M.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310321, 361289, H01L 4110

Patent

active

044095090

ABSTRACT:
The resonance of a piezoelectric vibrating element itself sets the frequency of the excitation producing ac oscillator for e.g. Kelvin probe or chopper applications.
The oscillation amplitude is continuously adjustable. The superposition of a dc voltage in addition to the ac excitation voltage renders a continuously adjustment of the mean spacing of the working electrodes. A phase stable reference signal is provided for phase sensitive amplifier synchronization.

REFERENCES:
patent: 3093783 (1963-06-01), Hass
patent: 3218636 (1965-11-01), Bernstein et al.
patent: 3515890 (1970-06-01), Kohashi et al.
patent: 3611127 (1971-10-01), Vosteen
patent: 3949246 (1976-04-01), Lohrmann
patent: 4100442 (1978-07-01), Besocke
patent: 4156150 (1979-05-01), Harrigan et al.
"Halbleiter-Schaltungstechnik" by Tietze and Schenk, 1974.

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