Low Light Level Imaging Devices For The Middle Ultraviolet

G. Carruthers; J. Kervitsky; G. Hicks; C. Opal

doi:10.1117/12.954786

27 July 1976 Low Light Level Imaging Devices For The Middle Ultraviolet

G. Carruthers, J. Kervitsky, G. Hicks, C. Opal

Proceedings Volume 0078, Low Light Level Devices for Science and Technolgy; (1976) https://doi.org/10.1117/12.954786
Event: 1976 SPIE/SPSE Technical Symposium East, 1976, Reston, United States

Abstract

Electronic imaging devices based on the magnetically-focused, internal-optic Schmidt image converter concept, previously used at NRL for the vacuum ultraviolet, have been developed with cesium telluride photocathodes for use in the middle ultraviolet (2000-3000 A). These devices are intended primarily for flame and mid-UV source obser-vations, but also have applications to astronomy and to planetary atmosphere studies. Three versions of these devices have been constructed and tested: (1) a single-stage image converter with a phosphor/fiber optic output, for film recording or coupling to a low-light-level television camera tube, (2) an image converter incorporating a micro-channel intensifier stage with proximity focusing of the output onto a phosphor screen, and (3) same as (2) except with magnetic focusing from the microchannel plate output onto the phosphor screen. The latter two devices can be used with direct viewing of the phosphor output, or with lens coupling to a film camera or television camera tube. They can also be fiber-optically coupled to a CCD array. In each case, single-photo-electron events are detectable. Cesium telluride photocathodes appear to be significantly more stable in the presence of small leaks and outgassing than are cesium antimonide photocathodes. Therefore, electrographic recording should be easier with the Cs₂Te photocathodes, and preliminary investigations are being initiated.

Citation Download Citation

G. Carruthers, J. Kervitsky, G. Hicks, and C. Opal "Low Light Level Imaging Devices For The Middle Ultraviolet", Proc. SPIE 0078, Low Light Level Devices for Science and Technolgy, (27 July 1976); https://doi.org/10.1117/12.954786

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