Construction and processing of optical images

Reference-free method for forming a three-dimensional image and determining the angular velocity of a remote object

V. I. Mandrosov

Moscow Institute of Physics and Technology (State University)

Abstract: We propose a reference-free method for forming a threedimensional image and for determining the angular velocity of a remote nonplanar object. The method is based on probing an object by laser radiation with a coherence length that is smaller or larger than the size of the object and on the use of a screen with radial holes in the centres of which photodetectors are located, the screen being mounted in the region of the flat image of the object. A threedimensional image of the object is constructed using the visibility of the interference fringes formed behind the screen due to radiation beams scattered by the object which pass through various pairs of holes (one of the holes is fixed). The three components of the angular velocity vector of the object are determined by the power spectrum of the electric signal produced during the movement of interference fringes on a photodetector mounted behind the screen.

Keywords: visibility of interference fringes, reconstruction of threedimensional images of remote objects by their flat coherent images, Doppler effect.

PACS: 42.30.Va, 42.25.Kb, 42.25.Hz

Received: 07.02.2012
Revised: 24.04.2012

 English version: Quantum Electronics, 2012, 42:7, 625–633

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