Radiant energy – Infrared-to-visible imaging – Including means for scanning field of view
Patent
1989-08-02
1990-02-20
Henry, Jon W.
Radiant energy
Infrared-to-visible imaging
Including means for scanning field of view
2502521, 350 66, G02B 2610, H04N 533
Patent
active
049028936
ABSTRACT:
A radiation scanning system comprises scan mirrors optically coupled together by means of a spherical reflector to relay the scan mirror pupils through the optical path with minimal pupil shift for both wide and narrow field-of-view applications. The mirrors may oscillate at a predetermined fundamental frequency and a hamonic thereof to achieve near linear line scans or both line scan mirrors may oscillate at the predetermined fundamental frequency to achieve wider scan angles. In another embodiment, a line scan mirror is mounted on a multi-mode resonant scanner and phase lock oscillated at multiple frequencies while a second scan mirror functions as the field or line scanning element. In yet another embodiment, one line scan mirror is mounted on a non-turnable resonant scanner while a second scan mirror functions as the field scanning element. General compatibility with TV formatted systems can be achieved through self resonance or by controlling the fundamental line scan frequency through an external master clock. The line scan mirrors can operate at a predetermined fundamental frequency which is a fraction of the standard TV line frequency. System scanners may be passive, active or combinations thereof, and can operate in the ultraviolet, visible, or infrared spectrums.
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