System method and apparatus for optical directional...

Details System method and apparatus for optical directional... System method and apparatus for optical directional...

2008-04-03

2010-10-12

Toatley, Jr., Gregory J (Department: 2877)

Optics: measuring and testing

By particle light scattering

With photocell detection

C356S337000

Reexamination Certificate

active

07812950

ABSTRACT:
A method for measuring the direction and velocity of a target in a measurement volume in a laser Doppler velocimetry system includes selecting a discrete number of grating positions for an electrically switchable grating, placing the electrically switchable grating in a light path of a laser source. The laser source outputs a laser beam along the light path. The method further includes switching the electrically switchable grating sequentially through the discrete number of grating positions at a grating frequency to generate diffracted light beams from the laser, directing the diffracted light beams through a lens, focusing the diffracted light beams on a measurement volume, passing a target through the measurement volume in a target direction at a target velocity and receiving scattered light in a detector and calculating the power spectrum of light intensity fluctuations. The power spectrum includes a maximum peak. The maximum peak occurs at a frequency shifted from the grating frequency an amount corresponding to the target velocity and in a direction corresponding to the target direction. A laser Doppler velocimetry system for measuring the direction and velocity of a target in a measurement volume is also disclosed.

REFERENCES:
patent: 5194745 (1993-03-01), Takamiya et al.

Affiliated with

Also associated with

Rating

System method and apparatus for optical directional... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System method and apparatus for optical directional..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System method and apparatus for optical directional... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4222824