Automatic, self sustaining probe for measuring the work function

Details Automatic, self sustaining probe for measuring the work function Automatic, self sustaining probe for measuring the work function

1985-01-29

1987-03-10

Krawczewicz, Stanley T.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 56, G01R 3102

Patent

active

046493360

ABSTRACT:
An apparatus for measuring changes in the work function of a surface using a method devised by Kelvin and known as the "dynamic capacitor method". This apparatus comprises a system for monitoring and automatically regulating the vibration of a Kelvin probe reed assembly during variation of the experimental conditions. This system includes a piezo-ceramic crystal mounted on the probe support rod to detect the vibrations of the reed and a phase locked loop circuit which compares the signal from the piezo-ceramic detector with the signal of the reed drive coil, interprets a change in the reed resonance as a phase shift relative to the coil drive phase and then shifts the coil drive frequency to maintain the correct phase relationship.

REFERENCES:
patent: 3187256 (1965-06-01), Foster
patent: 3828607 (1974-08-01), Janzen et al.
patent: 4072896 (1978-02-01), Bijlmer
patent: 4447782 (1984-05-01), Rutkoski

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