Ultrasonic microscope

Details Ultrasonic microscope Ultrasonic microscope

1991-12-18

1994-03-08

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

G01N 2904

Patent

active

052917860

ABSTRACT:
An ultrasonic microscope of this invention generates a transmission signal from a transmission timing circuit, converts this transmission signal into an ultrasonic pulse, radiates the ultrasonic pulse on a sample, receives an echo from the sample, and generates an electrical echo signal corresponding to the echo. This echo signal is distributed by a distributor to generate a plurality of echo signals. The plurality of echo signals are input to a delay circuit and a gate timing signal generator. The gate timing signal generator generates a gate timing signal with reference to an echo signal exceeding a threshold value. A first gate signal generator generates a first gate signal for determining a first gate period with reference to the transmission timing of the transmission signal. The first gate signal is input to a second gate signal generator. When the gate timing signal is generated within the first gate period, a second gate signal for determining a second gate period is generated with reference to this gate timing signal. A predetermined echo component is extracted by the second gate signal from the echo signal delayed by the delay circuit.

REFERENCES:
patent: 3805597 (1974-04-01), Ohta et al.
patent: 3818898 (1974-06-01), Williams
patent: 3996791 (1976-12-01), Niklas et al.
patent: 4651568 (1987-03-01), Reich et al.
patent: 4655084 (1987-04-01), Renzel
patent: 4866986 (1989-09-01), Cichanski

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