Scanning afocal laser velocimeter projection lens system
Abstract
A method and apparatus for projecting and focusing parallel laser light beams from a laser doppler velocimeter on a target area are described. The system includes three lenses. Two lenses work together as a fixed afocal lens combination. The third lens is a movable scanning lens. Parallel laser beams travel from the velocimeter through the scanning lens and through the afocal lens combination and converge, i.e., are focused, somewhere beyond. Moving the scanning lens relative to the fixed afocal combination results in a scanning of the focus area along the afocal combination's optical axis.
- Publication:
-
National Aeronautics and Space Administration Report
- Pub Date:
- August 1982
- Bibcode:
- 1982nasa.reptR....R
- Keywords:
-
- Focusing;
- Laser Doppler Velocimeters;
- Laser Guidance;
- Lenses;
- Optical Scanners;
- Doppler Effect;
- Frequency Shift;
- Lens Design;
- Patents;
- Lasers and Masers