Automatic calibration method for thickness gauges

Details Automatic calibration method for thickness gauges Automatic calibration method for thickness gauges

1989-04-11

1990-09-11

Raevis, Robert

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

G01N 2900

Patent

active

049552252

ABSTRACT:
A method for calibrating a thickness measuring system that automatically compensates for inadvertent movements of the probe. In one emobodiment, a conventional thickness measuring system is provided that incorporates a pair of spaced apart opposing ultrasonic sensors that are positioning a known distance apart. A target is passed between the sensors and the distance from each sensor to the target is measured. The thickness of the target can be determined by subtracting the distance from each sensor to the target from the known distance between the targets. The improvement, being a method of periodically checking the distance between the sensors to compensate for movements of the sensor relative to each other due to such effects as thermal expansion or inadvertent movements. The automatic compensation technique can be applied to a single probe system as well.

REFERENCES:
patent: 2635746 (1953-04-01), Gordon
patent: 3844163 (1974-10-01), Di Leo
patent: 4437332 (1984-03-01), Pittaro
patent: 4567747 (1986-02-01), Matay
patent: 4569037 (1986-02-01), Seiferling
patent: 4624127 (1986-11-01), Narushima et al.

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