Automatic, self-sustaining probe for measuring the work...

Details Automatic, self-sustaining probe for measuring the work... Automatic, self-sustaining probe for measuring the work...

G - Physics

01

R

324/39, 349/42,

G01R 31/02 (2006.01) G01R 15/16 (2006.01) G01R 29/24 (2006.01)

Patent

CA 1248621

TITLE Automatic, Self-Sustaining Probe for Measuring the Work Function INVENTORS Patrick Ellis Bindner Peter Robert Norton Eric Barclay Selkirk ABSTRACT OF DISCLOSURE 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.

495149

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