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Zoom lens compensator for a cylindrical window in laser anemometer uses
Applied Optics
|June 5, 2010
Summary
Optical aberrations in laser anemometer systems caused by enclosure windows can be corrected. A zooming lens effectively eliminates astigmatism from thick windows, achieving diffraction-limited performance for laser flow measurements.
Area of Science:
- Optical Engineering
- Fluid Dynamics Measurement
Background:
- Laser anemometer systems often use windows to enclose flow fields.
- Window aberrations can degrade measurement accuracy.
- Flat windows can be corrected by adjusting object distance.
Purpose of the Study:
- To present a method for correcting optical aberrations in laser anemometer systems caused by enclosure windows.
- To achieve diffraction-limited performance despite window-induced distortions.
Main Methods:
- Utilizing a zooming correction lens to counteract astigmatism from thick cylindrical windows.
- Implementing procedures to correct residual anamorphic distortion.
Main Results:
- The zooming correction lens successfully eliminates astigmatism.
- Diffraction-limited performance is achieved in a monochromatic laser anemometer system.
- Effective procedures for correcting residual anamorphic distortion are presented.
Conclusions:
- Optical aberrations from enclosure windows in laser anemometers can be effectively corrected.
- The proposed zooming lens system enables high-performance flow field measurements.
