Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1989-03-24
1994-01-04
Lerner, Martin
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359223, 359225, 359872, G02B 718, G02B 2608
Patent
active
052765458
ABSTRACT:
A mirror alignment and damping device (10) maintains orthogonality between the fixed mirror and the moving mirror in an interferometric spectrometer. The device (10) includes electromagnetic motion imparting units (32, 34, 36, and 38) which have electromagnetic coils (40) and threadedly adjustable pole pieces (44). The electromagnetic motion imparting units (32, 24, 26, and 38) are preferably arranged along perpendicular axes along a base (12) in order to enable independent orthogonal tilting of the mirror (26). Each voice coil consists of a wound wire coil (40) immersed in an annular magnetic field created by permanent magnets (42) which are mounted on a mirror support (44). A course tilt adjust is accomplished by adjusting the pole pieces (44) toward or away from the permament magnets (42) so as to increase or decrease the gap between the permanent magnets (42) and the pole pieces (44), thereby causing a corresponding increase or decrease in the magnetic forces acting between the magnets (42) and pole pieces ( 44). A fine adjust is then accomplished by inducing an appropriate current through the wire coils (40). Damping results from the use of a thermoplastic collar which is sandwiched between the base (12) and the mirror support (24).
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Badeau Robert R.
Daun Michael
Kisslinger Jack G.
Lerner Martin
Nicolet Instrument Corporation
Shafer R. D.
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