Light-trap design using multiple reflections and solid-angle attenuation - Application to a spaceborne electron spectrometer

Details Light-trap design using multiple reflections and solid-angle attenuation - Application to a spaceborne electron spectrometer Light-trap design using multiple reflections and solid-angle attenuation - Application to a spaceborne electron spectrometer

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apopt..31.5331h&link_type=abstract

Applied Optics (ISSN 0003-6935), vol. 31, no. 25, Sept. 1, 1992, p. 5331-5340.

Physics

Optics

6

Electromagnetic Absorption, Energy Dissipation, Imaging Spectrometers, Optical Reflection, Satellite-Borne Instruments, Light Scattering, Photomultiplier Tubes, Spectral Reflectance, Ultraviolet Radiation, Velocity Distribution

Scientific paper

The design and performance of a new light trap for a spaceborne electron spectrometer are described. The light trap has a measured photon-rejection ratio of 2 x 10 exp -11, allowing only one in 5 x 10 exp 10 incident photons to reach the sensitive area of the instrument. This rejection is more than sufficient because the ambient UV in earth orbit requires a rejection no better than 10 exp -8 to maintain the photon interference to less than 10 count/s. The light trap uses triple reflections to keep most of the light passing through the entrance slit away from the sensitive area of the spectrometer. It is shown that the average reflectance of all the internal surfaces must be less than 0.006, which is consistent with the data on the black coating applied to all surfaces. The analysis makes it possible to compare the photon contributions of each of the internal reflecting areas and to estimate the effective scattering width of the metallic electrode edge.

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