High Speed Spectrograph Shutter

Abstract

An electromechanical shutter is described which will open and close a 20-μ spectrograph slit in 5 μsec after a delay of 20 μsec. The shutter incorporates a movable slit which is propelled across the stationary spectrograph slit by the thermal expansion of a Joule-heated hairpin-shaped Nichrome wire.