Ultrasonic measuring apparatus for measuring a predetermined bou

Details Ultrasonic measuring apparatus for measuring a predetermined bou Ultrasonic measuring apparatus for measuring a predetermined bou

1989-03-28

1990-09-04

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

73620, G01N 2900

Patent

active

049534050

ABSTRACT:
An ultrasonic measuring method and an ultrasonic measuring apparatus utilize the level of a reflected ultrasonic reception signal coming from an object to be examined as measurement data after the level has been provided with either a positive or a negative sign in accordance with the phase of the reception signal.

REFERENCES:
patent: 3934458 (1976-01-01), Beretsky et al.
patent: 4100808 (1978-07-01), Evans et al.
patent: 4193306 (1980-03-01), Flaherty et al.
"H-F Ultrasonic Testing of Bonds: Application to Silicon Power Devices" by R. S. Gilmore et al., Materials Evaluation/Jan. 1979.

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