Electrostatic transducer for length measurement system

Details Electrostatic transducer for length measurement system Electrostatic transducer for length measurement system

1981-06-26

1984-03-20

Tokar, Michael J.

Electricity: measuring and testing

A material property using electrostatic phenomenon

324457, 324 72, G01N 2760

Patent

active

044384025

ABSTRACT:
A non-contacting electrostatic mark/sense length measurement gauge is used to place discrete areas of electrostatic charge at very accurately spaced intervals along a relatively moving material surface. Special construction of both the electrostatic marking and sensing transducers is employed. To compensate for expected unreliability of the mark/sense length gauge, a conventional highly reliable but less accurate contacting length gauge (such as a tachometer in rolling contact with the relatively moving material) is employed. The output from the electrostatic mark/sense length gauge and from the tachometer length gauge are combined by special electronic circuits to provide a length measurement of the passing material which is both highly accurate and reliable under all expected measurement conditions.

REFERENCES:
patent: 2989690 (1961-06-01), Cook
patent: 3096478 (1963-07-01), Brown
patent: 3303419 (1967-02-01), Gith
patent: 3729675 (1973-04-01), Vosteen

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