Temperature-compensated ultrasonic measurement of wall thickness

Details Temperature-compensated ultrasonic measurement of wall thickness Temperature-compensated ultrasonic measurement of wall thickness

1986-04-08

1988-01-19

Chapman, John

Measuring and testing

Vibration

By mechanical waves

264 401, 425141, G01N 2900

Patent

active

047198087

ABSTRACT:
An apparatus for measuring the thickness of a tubular plastic layer during the process of its fabrication, which includes an ultrasonic transducer which generates a signal dependent on the thickness of the shape being measured while the shape is at a non-uniform condition of temperature, and circuitry for generating at least one signal from known process parameters, and an arithmetic unit for processing the signals derived as described above to generate an error signal which compensates for the influence of temperature on the test.

REFERENCES:
patent: 3916676 (1975-11-01), Boggs et al.
patent: 4137025 (1979-01-01), Graves et al.
patent: 4346599 (1982-08-01), McLaughlin et al.
patent: 4520672 (1985-06-01), Saint-Amour

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