Visual occultation to measure refractivity profile

Details Visual occultation to measure refractivity profile Visual occultation to measure refractivity profile

G - Physics

01

N

G01N 21/41 (2006.01) B64D 43/00 (2006.01)

Patent

CA 2711349

Presented is a system and method for measuring the refractivity profile of a parcel of atmosphere comprising an image capturing device for capturing an image of a visual feature, such as a topographic feature like the horizon, combined with a lens having focal length adapted to focus an image onto image capturing device such that the combination of the lens and the image capturing device are adapted to resolve at least 100 microradians of angle, and an image processor adapted to compare a detected position of the visual feature in the image to the expected position of the visual feature. The system uses the difference between the detected position and the expected position to detect the change in arrival angle caused by atmospheric refraction of light from the visual feature as it passes through the atmosphere.

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