Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Reexamination Certificate
2006-12-26
2006-12-26
Robinson, Mark A. (Department: 2872)
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
C359S226200, C343S758000
Reexamination Certificate
active
07154650
ABSTRACT:
Scanning apparatus operable in the microwave, mm-wave and infrared ranges and comprises a support structure, a first reflective disc or mirror (10) which is mounted in said support structure for rotation relative to the support structure about a first axis (14), and a second reflective disc or mirror (12) which is mounted in said support structure for rotation relative to the support structure about a second axis (16) and driving means for said discs or mirrors arranged to drive these in respective opposite senses. In operation of the apparatus, radiation from a scene being scanned reaching a reflective surface of the first disc or mirror is reflected thereby onto a reflective surface of the second disc or mirror, to be reflected by the latter, in turn, onto the reflective surface of the first disc or mirror again, to be reflected from the first disc or mirror into or onto a further part of the apparatus incorporating a receiver or receivers for such radiation. The reflective surface of the first disc or mirror has an axis of rotational symmetry, tilted at a first small angle relative to said first axis and the reflective surface of the second disc or mirror has an axis of rotational symmetry tilted at a second angle relative to said second axis. The driving means for the discs or mirrors is arranged to drive these in such a way as to effect a substantially linear scan. the size of said second angle relative to said first angle being selected so as to reduce or eliminate pupil wander in the direction orthogonal to the direction of line scan.
REFERENCES:
patent: 4042933 (1977-08-01), Lapp
patent: 4871904 (1989-10-01), Metlitsky et al.
patent: 4923263 (1990-05-01), Johnson
patent: 5555125 (1996-09-01), Peng
patent: 6587246 (2003-07-01), Anderton et al.
Farran Technology Limited
Poff Clifford A.
Robinson Mark A.
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