Invention Grant
- Patent Title: Differential polarization LADAR
- Patent Title (中): 差分极化LADAR
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Application No.: US819283Application Date: 1992-01-13
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Publication No.: US5272351APublication Date: 1993-12-21
- Inventor: C. Clifton Andressen
- Applicant: C. Clifton Andressen
- Applicant Address: DE Wilmington
- Assignee: Hercules Incorporated
- Current Assignee: Hercules Incorporated
- Current Assignee Address: DE Wilmington
- Main IPC: G01S7/499
- IPC: G01S7/499 ; G01N21/86
Abstract:
The present invention provides a long range LADAR (Laser Detection and Ranging), that employs in combination a 1.32 micron, Q-switched, diode-pumped Nd:YLF laser whose output beam is linearly polarized. A quarter-wave plate is positioned in front of the laser such that the laser's (e.g. vertical)polarized light is converted to right circular polarization. Reflection from a specular surface returns left circular polarized light. A second quarter-wave plate transforms the left circular polarized light to horizontally polarized light which is then propagated through a beam splitter to two Gallium Arsenide Avalanche Photo-Diode detectors. This invention provides both substantial reduction in eye injury potential and good transmission in the atmosphere while improving scattering performance.
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