NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Light-trap design using multiple reflections and solid-angle attenuation - Application to a spaceborne electron spectrometerThe 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.
Document ID
19920073375
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Herrero, Federico A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
September 1, 1992
Publication Information
Publication: Applied Optics
Volume: 31
Issue: 25, S
ISSN: 0003-6935
Subject Category
Optics
Accession Number
92A55999
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available