ULTRASONIC THREE DIMENSIONAL IMAGING USING HOLOGRAPHIC TECHNIQUES.
PERKIN-ELMER CORP NORWALK CONN OPTICAL GROUP RESEARCH
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This report describes an investigation of the basic feasibility of making ultrasonic holograms and of obtaining from them three-dimensional images of optically opaque objects. Experimental equipment was fabricated to make ultrasonic holograms in water of objects up to 5 cm in diameter at an ultrasonic frequency of 5 megahertz. The resulting holograms were then used to make visible images. Holograms of objects examined in water where the ultrasonic wavelength was 0.3 mm show image detail smaller than 1 mm. A hologram was also made of a 3-mm diameter hole in an aluminum block where the ultrasonic wavelength was 1.3 mm. The hole was at 45 deg. to the hologram plane. Conventional coherent and incoherent visible light photographs of the same objects are presented for comparison. The appendix presents a theoretical analysis of ultrasonic holograms and the images produced from them. Author
- Test Facilities, Equipment and Methods