Differential nonmetals thickness gauge

Details Differential nonmetals thickness gauge Differential nonmetals thickness gauge

1980-11-06

1982-12-07

Haroian, Harry N.

Geometrical instruments

Area integrators

Electrical

G01B 706

Patent

active

043619630

ABSTRACT:
A gauge for measuring the thickness of a nonmetallic article employs differential air core transformer principles. A transmitting coil is axially aligned between two identical receiving coils. The test article is positioned between the transmitting coil and a first one of the receiving coils. The distance between the second receiving coil and the transmitting coil is adjusted until the signals received by the two receiving coils are balanced. The distance between the second receiving coil and the transmitting coil then corresponds identically to the distance between the transmitting coil and the first receiving coil. Direct reading measurement devices may be provided.

REFERENCES:
patent: 2484623 (1949-10-01), Heising
patent: 3213542 (1965-10-01), Murtland

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