Gauge for measuring distance to planar surfaces and thicknesses

Details Gauge for measuring distance to planar surfaces and thicknesses Gauge for measuring distance to planar surfaces and thicknesses

1978-05-08

1979-11-27

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

G01N 2900

Patent

active

041754417

ABSTRACT:
Apparatus for measuring distance between a gauge head orifice, and the front planar surface of an object by sensing acoustic pressure near the gauge head orifice. The acoustic pressure is initially generated by an audio oscillator activating a speaker which emits acoustic waves through a first orifice. Acoustic pressure is sensed through a second orifice, proximate to the first, and the pressure is converted to an electrical signal which is processed to yield a distance signal for a display. Two similar distance gauges spaced apart on opposite sides of a planar member at a known distance are used to compute the thickness of the planar member.

REFERENCES:
patent: 2268643 (1942-01-01), Crosby
patent: 2538444 (1951-01-01), De Mars
patent: 2640190 (1953-05-01), Rines
patent: 2819613 (1958-01-01), Neiley
patent: 3228232 (1966-01-01), Proctor
patent: 3500301 (1970-03-01), Meier
patent: 3694800 (1972-09-01), Frank
patent: 3750461 (1973-08-01), Felix

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