Accession Number : AD0164720

Title :   Laser Doppler Velocimeter.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Farmer,W. M.

Report Date : 04 FEB 1974

Pagination or Media Count : 10

Abstract : The patent application relates to the measurement of velocity of a flowing medium, and more particularly to a laser doppler velocimeter measuring fluid velocity in two components. In the invention the laser beam is obtained by diffraction, using the Bragg effect. The Bragg cell invention is a two-dimensional Bragg cell as distinguishing from the common nonself-aligning Bragg cell laser velocimeter. Also, in the present invention only a single detector is required for both velocity components, as the components are separated electronically after signal detection and not optically before detection, as with previous systems.

Descriptors :   *Laser velocimeters, Flowmeters, Doppler systems, Patents

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE