Patent
1982-11-10
1984-07-24
Henry, Jon W.
350 67, G02B 2717
Patent
active
044615345
ABSTRACT:
An optical scanning system comprises a rotor assembly (10) rotatable about axis (11) and having a first reflective zone (12) composed of planar facets (12A, 12B, 12C, etc.) and a second reflective zone (13) composed of facets (13A, 13B, 13C etc.) which may be planar or curved. An array of radiation detectors (26) is focussed by static focussing means (14) at a first reflection station through which the facets of the first zone (12) sequentially pass. Further static optical means (15) are provided to direct radiation between the first reflection station and a second reflection station through which the facets of the second zone (13) sequentially pass. The facets (12A, 12B, 12C etc.) of the first reflective zone (12) each have a normal disposed at an angle .psi. to the rotational axis (11); the incident and reflected radiation beams at the first reflection station each have a half cone angle .alpha. as determined by optical means ( 14) and the principal ray of the incident and reflected conical beams each subtend an angle of .beta./2 to the normal (17) of the facets (12A, 12B, 12C etc). The angles .alpha., .beta. and .psi. conform to the relationship
Barr & Stroud Limited
Henry Jon W.
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