Measuring and testing – Vibration – By mechanical waves
Patent
1978-06-21
1980-09-16
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
G01N 2904
Patent
active
042222737
ABSTRACT:
To provide an improved holographic operation, a digital type ultrasonic holography apparatus is provided utilizing a clock pulse generator having a predetermined periodicity, an ultrasonic pulse beam generator for directing an ultrasonic beam to an object for measurement in synchronism with said clock pulse, a reflected wave conversion unit for converting reflected ultrasonic pulse beams from said object for measurement into digital pulses, a time coincidence detector for detecting time coincidence between said clock pulse and said 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 said ultrasonic pulse beam generator to a desired position, and a display device for displaying the hologram of said object for measurement using said coincidence signal as a luminance signal and a position signal of said ultrasonic generating and receiving transducer as a deflection signal of said luminance signal. Using this holography apparatus a hologram of said object for measurement is displayed in a fringe pattern and the position and shape of said object for measurement are measured from those of the fringe pattern.
REFERENCES:
patent: 3632183 (1972-01-01), Halnes et al.
patent: 3712119 (1973-01-01), Cross et al.
patent: 4021771 (1977-05-01), Collins et al.
Collins et al., "Acoustic Holographic Scanning Techniques for Imaging Flaws in Thick Metal Sections," Society of Photo-Optical Inst. Engineer Seminar, Feb. 1972, pp. 67-82.
Kanamori Takahiro
Suzuki Kazumichi
Takahashi Fuminobu
Hitachi , Ltd.
Kreitman Stephen A.
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