Pendulous compensator vibratory motion damping system
US4801791A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 1987 |
| Grant date | Jan 31, 1989 |
| Priority date | — |
| Expiry date | Jul 24, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/1828
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A system for dampening vibratory motion of a pendulous compensator in a laser beam projector includes a beam splitter which diverts a portion of a laser beam deflected by a mirror mounted on a cantilever beam of the compensator, and a photocell device having a pair of photodetectors positioned to receive the diverted laser beam portion and sense oppositely varying proportions thereof corresponding to the displacement of the position of the deflected laser beam. Two output signals are produced corresponding in magnitudes to the respective proportions of the diverted laser beam portion sensed by the photodetectors. A difference amplifier takes the difference of these output signals to produce a first electrical signal having a polarity and magnitude representing the direction and amount of motion of the cantilever beam. A derivative circuit takes the derivative of the first electrical signal with respect to time to produce a second electrical signal having a polarity and magnitude representing the direction and rate of movement of the cantilever beam. An electrical coil, having a magnet reciprocally movable relative thereto which is linked to the cantilever beam, produces a magnetic …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.