Laser anemometry with improved eye safety

Details Laser anemometry with improved eye safety Laser anemometry with improved eye safety

2006-09-22

2009-11-10

Tarcza, Thomas H (Department: 3662)

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

C356S028500

Reexamination Certificate

active

07616294

ABSTRACT:
The invention relates to an optical measurement device intended for determining a relative velocity vector {right arrow over (v)} of a carrier, such as an aircraft, with respect to a reference medium MILREF. The device includes an optical signal system EMIREC, delivering an optical signal Sinc that follows a direction called the line of sight LDV and is concentrated in a focusing zone ZOF, and means for displacing the focusing zone ZOF in the reference medium MILREF. According to the invention, the means for displacing the focusing zone ZOF act on the orientation of the line of sight LDV, subjecting it to a known movement, with a nonzero speed, a processing unit UTR determines the vector {right arrow over (v)} in at least one “search” phase based on an identification with an expected waveform of the variation in frequency of an electrical signal as a function of the orientation of the line of sight LDV in order to determine an approximate value of {right arrow over (v)}, followed by a “tracking” phase based on an iterative validation of values of {right arrow over (v)} close to the approximate value of {right arrow over (v)}.

REFERENCES:
patent: 3984685 (1976-10-01), Fletcher et al.
patent: 5313263 (1994-05-01), Abbiss et al.
patent: 2001/0009458 (2001-07-01), Asaka et al.
patent: 2005/0278098 (2005-12-01), Breed

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