26 September 2007 Lensless methods to transform small angular displacement of a laser beam into circular scanning and to receive radiation by the small-sized device within the limits of a spatial hemisphere
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Abstract
Presented radiating device transforms an angular displacement of a laser beam in limits of several degrees into circular movement on forming a cone which axis coincides with an optical axis of an emitter. Speed of such circular scanning does not depend on a corner of a scanning cone, and is determined by time mentioned small (within the limits of several degrees) linear moving of a laser beam with the help of standard methods. The suggested device basis is represented with a simple optical element with small losses of transformation on reflection. The reception device having a similar reception element provides gathering radiation from a wide spatial zone (close to a hemisphere), with proportional dependence of intensity of a registered signal on a corner of falling of a corresponding light beam, for example scattering back certain object of laser radiation. The radiation falling from a determined direction will be transformed to a corresponding ring zone on the receiver. Proceeding from position of a scanning beam and a ring zone on the receiver which direction reflected signal and distance up to a source of reflection is defined has come. The given devices can find application in compact systems of scanning for a wide range of systems of ecology, cartography, high technologies, medicine and biology. Absence of complex optical elements allows to avoid expensive manufacturing techniques, inaccessibility of direct influence on a working zone allows to provide high reliability of functioning of system
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Yury Polkanov, Yury Polkanov, } "Lensless methods to transform small angular displacement of a laser beam into circular scanning and to receive radiation by the small-sized device within the limits of a spatial hemisphere", Proc. SPIE 6681, Lidar Remote Sensing for Environmental Monitoring VIII, 668110 (26 September 2007); doi: 10.1117/12.738738; https://doi.org/10.1117/12.738738
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