Electrographic Instrumentation For Ultraviolet Imaging And Spectrography

George R. Carruthers

doi:10.1117/12.7972447

1 December 1979 Electrographic Instrumentation For Ultraviolet Imaging And Spectrography

George R. Carruthers

Author Affiliations +

Optical Engineering, Vol. 18, Issue 6, 186638 (December 1979). https://doi.org/10.1117/12.7972447

Abstract

The latest results in the Naval Research Laboratory program of far-ultraviolet electrographic camera development, and application of these cameras to astrophysical and upper-atmospheric investigations, are presented. A new large electrographic Schmidt camera, of 15 cm aperture and f/2 focal ratio, has been successfully used in two sounding rocket flights, one for direct imagery in the 1230-2000 A wavelength range and the second for objective spectrography in the 950-2000 A range, of stars and nebulae in the Cygnus region of the sky. The camera has an 11° field of view and better than 30 arc sec resolution (2 A spectral resolution with 600 line/mm objective grating). A nebular spectrograph, based on a microchannel-intensified electrographic Schmidt camera, was then payload of a June 1979 rocket flight. It covers the 1050-2000 A range, and can reach emission line features as faint as 10 Rayleighs in 60 second ex-posures with 5 A spectral resolution. Electrographic cameras with mesh-based semitransparent photocathodes, capable of observations in the extreme ultraviolet below 1050 A, are being developed for a number of space science applications. A camera with microchannel intensification is the detector in an XUV airglow/auroral spectrograph used in a February 1978 rocket flight, and cameras without microchannel intensification are proposed for various solar XUV spectrographic and spectroheliographic applications.

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George R. Carruthers "Electrographic Instrumentation For Ultraviolet Imaging And Spectrography," Optical Engineering 18(6), 186638 (1 December 1979). https://doi.org/10.1117/12.7972447

Published: 1 December 1979

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