Method of measuring cavities in formed product formed by superpl

Details Method of measuring cavities in formed product formed by superpl Method of measuring cavities in formed product formed by superpl

1996-01-31

1997-07-15

Chapman, John E.

Measuring and testing

Vibration

By mechanical waves

73629, G01N 2918

Patent

active

056486120

ABSTRACT:
The concentration of cavities in a formed product formed by superplastic forming is measured based on a propagation velocity of ultrasonic waves in the formed product. An ultrasonic measuring head which oscillates and receives ultrasonic waves is brought into contact with the formed product. A measurement is made of the propagation time required for the ultrasonic waves to be incident from the ultrasonic measuring head on the formed product to return to the ultrasonic measuring head upon reflection from a rear surface of the formed product. The propagation velocity is obtained from the measured propagation time and the thickness of the formed product.

REFERENCES:
patent: 4407682 (1983-10-01), Sawa et al.
patent: 4896278 (1990-01-01), Grove
patent: 5533411 (1996-07-01), Koiwa

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