High-speed electromechanical shutter for imaging spectrographs

Details High-speed electromechanical shutter for imaging spectrographs High-speed electromechanical shutter for imaging spectrographs

2005-08-30

2005-08-30

Evans, F. L. (Department: 2877)

Optics: measuring and testing

By dispersed light spectroscopy

For spectrographic investigation

C359S235000

Reexamination Certificate

active

06937331

ABSTRACT:
The present invention presents a high-speed electromechanical shutter which has at least two rotary beam choppers that are synchronized using a phase-locked loop electronic control to reduce the duty cycle. These choppers have blade means that can comprise discs or drums, each having about 60 (+/−15) slots which are from about 0.3 to about 0.8 mm wide and about 5 to about 20 mm long (radially) which are evenly distributed through out 360°, and a third rotary chopper which is optically aligned has a small number of slots, such as for example, 1 to 10 slots which are about 1 to about 2 mm wide and about 5 to about 20 mm long (radially). Further the blade means include phase slots that allow the blade means to be phase locked using a closed loop control circuit. In addition, in a preferred embodiment, the system also has a leaf shutter. Thus the invention preferably achieves a gate width of less than about 100 microseconds, using motors that operate at 3000 to 10,000 rpm, and with a phase jitter of less than about 1.5 microseconds, and further using an aperture with more than about 75% optical transmission with a clear aperture of about 0.8 mm×10 mm. The system can be synchronized to external sources at 0 6 kHz lasers, data acquisition systems, and cameras.

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