Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1997-12-03
1999-08-17
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356 401, 250225, G01J 120
Patent
active
059397063
ABSTRACT:
A high contrast imaging system (10) having an adaptive focal plane (52). The system (10) includes receiver optics (32) that receive radiation (30) from both a detected target (16) and a laser beam (14) incident thereon, and a polarizing beam splitter (44) that splits the radiation into a first beam of reflected laser radiation and a second beam of radiation (46). The polarizing beam splitter (44) linearly polarizes the second beam of detected target radiation (46). A beam polarizer (48) circularly polarizes the second beam of detected target radiation (46). An adaptive focal plane or micromirror array (52) reflects the circularly polarized detected target radiation back through the beam polarizer (48) to linearly polarize the reflected, second beam of radiation (46). A detector array (56) detects the reflected, second beam of radiation (62) and outputs a signal to tracker electronics (22) in accordance with the intensity of radiation. Tracker electronics (22) adjust the reflectivity of the micromirror array (52) to ensure that the radiation incident on the detector array (56) is at or below a predetermined threshold.
REFERENCES:
patent: 5770850 (1998-06-01), Bowen et al.
Pyo Kevin
TRW Inc.
Westin Edward P.
Yatsko Michael S.
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