Wide-field-of-view 83.4-nm self-filtering camera

Details Wide-field-of-view 83.4-nm self-filtering camera Wide-field-of-view 83.4-nm self-filtering camera

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993spie.2008..144z&link_type=abstract

Proc. SPIE Vol. 2008, p. 144-151, Instrumentation for Magnetospheric Imagery II, Supriya Chakrabarti; Ed.

Physics

Scientific paper

Photometric imaging of ionospheric/magnetospheric O II emission at 83.4 nm is a primary objective for mapping the distribution of O(superscript +) ions. However, instrumental sensitivity has been a major barrier to realizing this goal. We report an instrumental design employing a low focal ratio camera where the reflecting surfaces act as both narrowband reflection filters at 83.4 nm and wide field of view imaging system. The design includes coatings with reflectances that are relatively insensitive to the angle of incidence of light. The peak reflectance per mirror is more than 60% at 83.4 nm with the average reflectance for out-of- band wavelengths less than 5%. The net reflective transmission for the three imaging mirrors is greater than 20% with 6.8 nm bandwidth and 0.01% maximum transmittance for out-of- band wavelengths.

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