Multifunctional laser system for measuring regular and random optical refraction in the atmosphere

Yurii D. Kopytin; Victor V. Nosov; Evgenii V. Nosov

doi:10.1117/12.298063

15 January 1998 Multifunctional laser system for measuring regular and random optical refraction in the atmosphere

Yurii D. Kopytin, Victor V. Nosov, Evgenii V. Nosov

Proceedings Volume 3219, Optics in Atmospheric Propagation and Adaptive Systems II; (1998) https://doi.org/10.1117/12.298063
Event: Aerospace Remote Sensing '97, 1997, London, United Kingdom

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.

Citation Download Citation

Yurii D. Kopytin, Victor V. Nosov, and Evgenii V. Nosov "Multifunctional laser system for measuring regular and random optical refraction in the atmosphere", Proc. SPIE 3219, Optics in Atmospheric Propagation and Adaptive Systems II, (15 January 1998); https://doi.org/10.1117/12.298063

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KEYWORDS

Refraction

Atmospheric optics

Laser systems engineering

Laser sources

Phase measurement

Diffraction

Optical testing

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