3 September 1998 Small static and dynamic target detection in nontransparent medium and opaque water
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Target detection in water is achieved by optical registration and measurement of the shape of the surface disturbance of liquid caused by radiation pressure of ultrasound waves passing by or reflected from the object. In the first case, the effects of refraction and diffraction of a laser beam by the 'hump' are used. This method is very sensitive for detection and observation of dynamic underwater objects. In the second case the Talbot effect is used. Both methods allow to detect nd observe the dynamic objects inside a liquid. This report describes: the schemes and the equipment used for measuring the underwater objects; the results of the 'hump's' 3D shape measurement and its usage for creating 'humped' ultrasound hologram; the image of a small target produced by computer reconstruction of 'humped' ultrasound hologram. This report also demonstrates the possibility of using Talbot effect for measurement of the shape and thickness of oil films on liquid and solid surfaces and for the wettability angle measurements.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Vera Moiseevna Ginzburg, Vera Moiseevna Ginzburg, Alexander M. Andreyev, Alexander M. Andreyev, "Small static and dynamic target detection in nontransparent medium and opaque water", Proc. SPIE 3373, Signal and Data Processing of Small Targets 1998, (3 September 1998); doi: 10.1117/12.324641; https://doi.org/10.1117/12.324641


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