18 September 1998 Detection of static and dynamic objects in nontransparent media and opaque water
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Abstract
Holographic methods for observation of stationary and moving objects located behind a non-transparent screen, inside nontransparent construction or in opaque (turbulent) water are discussed. In the first, case, microwave holography is used. In particular, a stationary microwave facility or a holographic video camera with a picture frequency of 20 Hz is used. Defects inside various large concrete construction elements and protection lids were found. An image of a live dog behind a non-transparent wall was recorded. In the second case, ultrasound radiation was used. In particular, water surface disturbances caused by the radiation pressure of ultrasound waves passing across underwater objects were recorded. Two methods were created; one based on the effects of refraction and diffraction of a laser beam by water surface disturbances, and another based on the Talbot effect. It is shown that the first method can be used for detection of dynamic underwater objects crossing the sound beam. The Talbot effect method permits, besides detection, formation of images of these objects. Examples are shown of detection of live fish in opaque water and formation of images of small (approximately 1.5 cm2) motionless objects.
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Vera Moiseevna Ginzburg, Vera Moiseevna Ginzburg, "Detection of static and dynamic objects in nontransparent media and opaque water", Proc. SPIE 3371, Automatic Target Recognition VIII, (18 September 1998); doi: 10.1117/12.323876; https://doi.org/10.1117/12.323876
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