G - Physics – 02 – B
Patent
G - Physics
02
B
349/42, 88/0.18
G02B 5/32 (2006.01) G01N 29/06 (2006.01)
Patent
CA 1125064
DIGITAL TYPE ULTRASONIC HOLOGRAPHIC APPARATUS Abstract of the Disclosure The invention provides an improved holographic operation in which a digital type ultrasonic holography apparatus utilizes a clock pulse generator having a pre- determined periodicity, an ultrasonic pulse beam generator for directing an ultrasonic beam to an object for measure- ment in synchronism with the clock pulse, a reflected wave conversion unit for converting reflected ultrasonic pulse beams from the object for measurement into digital pulses, a time coincidence detector for detecting time coincidence between the clock pulse and the digital pulses contained in a predetermined gate period and producing as output a coincidence signal when they coincide with each other, a unit for moving an ultrasonic generating and receiving transducer included in the ultrasonic pulse beam generator to a desired position, and a display device for displaying the hologram of the object for measurement using the coin- cidence signal as a luminance signal and a position signal of the ultrasonic generating and receiving transducer as a deflection signal of the luminance signal. Using this holography apparatus, a hologram of the object to be measured is displayed in a fringe pattern and the position and shape of the object are measured from those of the fringe pattern.
347474
Suzuki Katsumichi
Takahashi Fuminobu
Hitachi Ltd.
Kirby Eades Gale Baker
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