Measuring and testing – Vibration – By mechanical waves
Patent
1978-05-12
1979-08-28
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
340 5H, G01N 2904
Patent
active
041656474
ABSTRACT:
A scan acoustical holographic apparatus and method is described for sequentially acoustically scanning the interior of an optically opaque volume. The apparatus includes an array of acoustical transducers that are coupled to the volume. A plurality of frequency divider means receive high frequency clock pulses and generate transmit electrical pulse signals to the transducers having a frequency that is a fraction of the clock pulse frequency. The phases of the transmit signals are controlled by programmable read-only-memories in accordance with the distances between the transducers and selected focal points within the volume to effectively focus the transducers on the focal point. Receive signals are mixed with the phase adjusted transmit signals to effectively focus the transducers during a receive mode and to generate high amplitude holographic signals when the receive signals are in phase with the phase altered transmit signals. The resultant holographic signals are electronically processed to form an electronic analogue hologram which is utilized to visually display a holographic image of the interior of the volume.
REFERENCES:
patent: 3792423 (1974-02-01), Becker et al.
patent: 4021771 (1977-05-01), Collins et al.
Ciarlante Anthony V.
International Submarine Services
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