Ultra Violet Imager System.

Princeton Scientific Instruments, Inc., has developed for the Air Force Geophysical Laboratory, AFGL, an Ultraviolet Imager to measure the spatial distribution of the UV radiation of missiles. An f2.8, 200 mm focal length Cassigrain telescope optic is followed by a filter wheel containing 5 narrow band UV filters. The optical image is focused onto a 25 mm diameter micro channel plate MCP image intensifier having a solar blind Cs2Te photocathode. Photoelectrons from the photocathode are proximity focused onto the MCP and the MCP output electrons are proximity focused onto a P-20 phosphor. A 17 mm f0.95 lens relays the d25 mm diameter phosphor image onto a CCD interline transfer type solid state image television camera. The television camera output is recorded by a video 34 inch magnetic tape cassette recorder and displayed on a 9 inch television monitor. The UV Imager exposure time can be varied by electronically shuttering the image intensifier from 1 ms to 33 ms, the television camera frame rate. Exposure times, filter wheel position and date are superimposed on the bottom of the video image.