Method of and apparatus for ascertaining a characteristic value

Details Method of and apparatus for ascertaining a characteristic value Method of and apparatus for ascertaining a characteristic value

1992-10-22

1994-04-12

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324659, G01R 2726

Patent

active

053029070

ABSTRACT:
The resonance frequency and/or damping of a high-frequency oscillator which contains a variable impedance (such as a capacitor in a moisture detector for coffee or tobacco) is ascertained by generating first signals which denote the envelope curves of oscillations during intervals between successive excitations of the oscillator. Pairs of second signals denoting predetermined portions of envelope curves are transmitted to a dividing circuit, and the quotients of such pairs of second signals are indicative of the damping. Resonance frequency is ascertained by counting the number of oscillations per interval. Oscillations of the oscillator can be rectified prior to the generation of first signals.

REFERENCES:
patent: 2948850 (1960-08-01), Ederer
patent: 3412856 (1968-11-01), Esenwein
patent: 3480857 (1969-11-01), Bialko et al.
patent: 3979581 (1976-09-01), Reuland
patent: 4560923 (1985-12-01), Hanson

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