NDLI: Research directed toward improved echelles for the ultraviolet. [large space teslescope spectrographs

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Research directed toward improved echelles for the ultraviolet. [large space teslescope spectrographs

Content Provider	NASA Technical Reports Server (NTRS)
Copyright Year	1977
Description	Low frequency gratings obtainable with present technology, can meet the grating-efficiency design goals for potential space telescope spectrographs. Gratings made with changes in the three specific parameters: the ruling tool profile, the coating material, and the lubricants used during the ruling process were compared. A series of coatings and test gratings were fabricated and were examined for surface smoothness with a Nomarski differential interference microscope and an electron microsocope. Photomicrographs were obtained to show the difference in smoothness of the various coatings and rulings. Efficiency measurements were made for those test rulings that showed good groove characteristics: smoothness, proper ruling depth, and absence of defects (e.g., streaks, feathered edges and rough sides). Higher grating efficiency should be correlated with the degree of smoothness of both the coating and the grating groove.
File Size	14271037
Page Count	40
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19780013484
Archival Resource Key	ark:/13960/t6353fn23
Language	English
Publisher Date	1977-09-02
Access Restriction	Open
Subject Keyword	Grooving Metal Coatings Echelle Gratings Lyman Alpha Radiation Echelette Gratings Ultraviolet Spectrometers Hubble Space Telescope Surface Properties Photomicrography Vacuum Deposition Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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