Olympus Optical Company, Ltd.

Mitsumori Hayashida

Kiyoshi Fujii

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.

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New Hyde Park, NY, United States of America

Mitsumori Hayashida