Device for detecting atmospheric turbulence

Details Device for detecting atmospheric turbulence Device for detecting atmospheric turbulence

2008-04-01

2008-04-01

Connolly, Patrick (Department: 2877)

Optics: measuring and testing

By light interference

Having partially reflecting plates in series

Reexamination Certificate

active

11313663

ABSTRACT:
The invention relates to a device for remote measurement of the properties of the atmosphere, more particularly a device used to detect atmospheric turbulence. The device operates on the lidar principle, using the backscattering of a laser beam by the air. The device comprises a laser emission source (1), optical means (5) for collecting a backscattered beam (3) that is backscattered by targets illuminated by the emission source (1), the backscattered beam (3) being substantially centerd about the wavelength of the emission source (1), and means (9) for generating interference fringes (24) resulting from the backscattered beam (3). The device also includes a spatial filter (11) allowing only a central spot of the interference fringes to be seen and, at the center of the spatial filter (11), a mask for blocking off the center of the central spot and more particularly the Mie line of the backscattered beam.

REFERENCES:
patent: 4482247 (1984-11-01), Meltz et al.
patent: 6088103 (2000-07-01), Everett et al.
patent: 6307626 (2001-10-01), Miles et al.
patent: 2004/0042001 (2004-03-01), Vaez-Iravani et al.
patent: 2004/0233410 (2004-11-01), Shiraishi
patent: 2004/0233411 (2004-11-01), Shiraishi
patent: 2006/0197946 (2006-09-01), Biellak et al.

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