Measuring and testing – Vibration – By mechanical waves
Patent
1981-01-19
1982-10-12
Birmiel, Howard A.
Measuring and testing
Vibration
By mechanical waves
73628, G01K 1124
Patent
active
043532560
ABSTRACT:
A parameter representative of a physical property of a continuously moving metal strip is determined by repetitively generating acoustical shock waves, containing ultrasonic frequencies, and adjacent the strip and measuring the speed of transmission of the shock wave in the strip. An electric spark generator with a collimator feeds the acoustic energy to the strip 10 and four microphones arranged as a first pair on opposite sides of the strip spaced a known distance from a second pair also on opposite sides of the strip pick up the signal transmitted through the strip. The difference between the mean time of arrival at the first pair and the mean time of arrival at the second pair enables the velocity of propagation in the strip to be determined despite movements of the strip transverse to its plane. The velocity of propagation in particular may be used as a measure of Young's modulus and hence, in the case of a material such as aluminium, as a measure of the temperature of heat treatment.
REFERENCES:
patent: 3375897 (1968-04-01), Engle et al.
patent: 3720098 (1973-03-01), Dixon
patent: 3782177 (1974-01-01), Hoop
patent: 4073007 (1978-02-01), Boivin
patent: 4291577 (1981-09-01), Baum et al.
Birmiel Howard A.
The Electricity Council
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