G - Physics – 02 – B
Patent
G - Physics
02
B
88/0.18
G02B 23/00 (2006.01) G01N 29/06 (2006.01) G01N 29/38 (2006.01) G01S 15/89 (2006.01) G03H 3/00 (2006.01)
Patent
CA 1150082
ABSTRACT OF THE DISCLOSURE A digital type ultrasonic holography apparatus includes a clock generator for generating a clock pulse signal having a fixed period, a transducer for transmit- ting spike-like ultrasonic pulses toward an object in synchronism with trigger pulses derived through the frequency division of the clock pulse signal and receiving the reflected wave from the object, a wave- form shaping circuit for shaping the received wave into a digital pulse signal, a coincidence detecting circuit for narrowering the pulse width of the digital pulse signal to a magnitude shorter than the period of the clock pulse signal and judging whether or not the pulse width- narrowered digital pulse is present at the level-changing time of the clock pulse signal, thereby to generate a coincidence signal, a scanner for scanning the trans- ducer, and a device for displaying a hologram of the object in accordance with the value of the coincidence signal and the scanning of the transducer. The ratio of the interference fringe occupied portion of the displayed hologram to the remaining portion thereof is determined by the narrowed pulse width of the digital pulse.
368945
Hitachi Ltd.
Kirby Eades Gale Baker
LandOfFree
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