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Proceedings Paper

Multifunctional laser system for measuring regular and random optical refraction in the atmosphere
Author(s): Yurii D. Kopytin; Victor V. Nosov; Evgenii V. Nosov
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Paper Abstract

In the context of modern radio physics approach, it is demonstrated theoretically and experimentally that diffraction properties of the received optical radiation may significantly affect the refraction angle measured with a phase sensitive receiving-recording system. Based on this approach harnessing coherent laser phenomena in plane and spherical waves, we suggest and develop to engineering procedures methods for determining the refraction angles from one-wave optical measurements. These methods are also applicable under conditions of highly inhomogeneous optical paths in the turbulent atmosphere. The LIRA multifunctional precision laser system for measuring regular and random optical refraction has been developed. In contrast with the known multiwave methods for remote refraction measurements, this system harnesses one- wave laser radiation. Its operation is based on instantaneous determination of the refraction angle from measurements of the image energy center of gravity of a remote laser source. Measurements are carried out with sampling frequencies up to 1000 Hz. The horizontal field-of-view angle is 100 sec of arc and the vertical field-of-view angle is up to 2 deg of arc. Average angular refraction is measured in the range 0.2 - 200 sec of arc. The measurement error is 0.2 sec of arc. Relative variance of angular refraction is measured in the range 0.1 - 1.0 sec of arc. Atmospheric path length varies between 0.5 and 30 km. The wavelength of the laser source is 0.63 micrometer. Laser sources generating other wavelengths can also be used in the system.

Paper Details

Date Published: 15 January 1998
PDF: 9 pages
Proc. SPIE 3219, Optics in Atmospheric Propagation and Adaptive Systems II, (15 January 1998); doi: 10.1117/12.298063
Show Author Affiliations
Yurii D. Kopytin, Institute of Atmospheric Optics (Russia)
Victor V. Nosov, Institute of Atmospheric Optics (Russia)
Evgenii V. Nosov, Institute of Atmospheric Optics (Russia)


Published in SPIE Proceedings Vol. 3219:
Optics in Atmospheric Propagation and Adaptive Systems II
Anton Kohnle; Adam D. Devir, Editor(s)

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