Mirror alignment and damping device
US5276545A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1989 |
| Grant date | Jan 4, 1994 |
| Priority date | — |
| Expiry date | Mar 24, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/4535
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 sand…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.