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The evaluation of a deformable diffraction grating for a stigmatic EUV spectroheliometerA high-efficiency, extreme ultraviolet (EUV) imaging spectrometer is constructed and tested. The spectrometer employs a concave toroidal grating illuminated at normal incidence in a Rowland circle mounting and has only one reflecting surface. The toroidal grating has been fabricated by a new technique employing an elastically-deformable sub-master grating replicated in a spherical form and then mechanically distorted to produce the desired aspect ratio of the toroidal surface for stigmatic imaging over the selected wavelength range. The fixed toroidal grating used in the spectrometer is then replicated from this surface. Photographic tests and initial photoelectric tests with a two-dimensional, pulse-counting detector system verify the image quality of the toroidal grating at wavelengths near 600 A. The results of these tests and the basic designs of two instruments which could employ the imaging spectrometer for astrophysical investigations in space are described; i.e., a high-resolution EUV spectroheliometer for studies of the solar chromosphere, transition region, and corona; and an EUV spectroscopic telescope for studies of non-solar objects.
Document ID
19880004955
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Timothy, J. G. (Stanford Univ. CA, United States)
Date Acquired
September 5, 2013
Publication Date
November 1, 1987
Subject Category
Instrumentation And Photography
Report/Patent Number
NASA-CR-182371
NAS 1.26:182371
Accession Number
88N14337
Funding Number(s)
CONTRACT_GRANT: NAGW-540
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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