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Ruled and holographic experiment (AO 138-5)The AO 138-5 experiment was designed, via the FRECOPA (FRench COoperative PAyload) experiment with the aim to study the optical behavior of different diffraction gratings submitted to space vacuum long exposure and solar irradiation. Samples were ruled and holographic gratings, masters or replica, and some additional control mirrors with various coatings. The experiment was located on the B3, trailing edge of the LDEF and was protected against Atomic Oxygen flux. The experienced thermal cycling was evaluated from -23 C to 66 C during the flight, 34,000 orbits. The samples (two batches of four pieces) were located on a dedicated plate, by a pair of equivalent gratings or mirrors; optical faces were located on the external side. The plate was inside a canister, which had been opened in space for ten months. When the satellite returned to Kennedy Space Center, the remaining vacuum in the canister was still correct. The analysis focused on the triple point characterization including light efficiency, wavefront flatness quality and stray light level. Tests were conducted on control mirrors and gratings (rules and holographic master or replica) loaded but not exposed to cosmic dust or direct solar irradiations. They did not show any significant variations. Solar exposure had damaged the coating (aluminum and platinum) reflectivity in the Ultra-Violet region; the degradation is higher with the gratings, in terms of efficiency. However, wavefront flatness quality and stray light level tests revealed no additional changes.
Document ID
19930020507
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bonnemason, Francis
(Jobin et Yvon S.A. Longjumeau, France)
Date Acquired
September 6, 2013
Publication Date
April 1, 1993
Publication Information
Publication: NASA. Langley Research Center, LDEF: 69 Months in Space. Part 4: Second Post-Retrieval Symposium
Subject Category
Instrumentation And Photography
Accession Number
93N29696
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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