Last edited by Gojin
Wednesday, May 6, 2020 | History

3 edition of Fabrication of lightweight Si/SiC LIDAR mirrors found in the catalog.

Fabrication of lightweight Si/SiC LIDAR mirrors

Jitendra Singh Goela

Fabrication of lightweight Si/SiC LIDAR mirrors

by Jitendra Singh Goela

  • 213 Want to read
  • 4 Currently reading

Published by National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, For sale by the National Technical Information Service] in [Washington, D.C.], [Springfield, Va .
Written in English

    Subjects:
  • Lasers -- Mirrors -- Design and construction.,
  • Optical radar -- Equipment and supplies -- Design and construction.,
  • Vapor-plating.,
  • Mirrors.,
  • Optical radar.,
  • Silicon.,
  • Silcon carbides.,
  • Vapor deposition.

  • Edition Notes

    StatementJitendra S. Goela and Raymond L. Taylor.
    SeriesNASA contractor report -- 4389., NASA contractor report -- NASA CR-4389.
    ContributionsTaylor, Raymond L., United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., Morton International Inc./CVD Incorporated., Langley Research Center.
    The Physical Object
    FormatMicroform
    Paginationviii, 88 p.
    Number of Pages88
    ID Numbers
    Open LibraryOL17726040M

    The optical transmission of chemical vapor deposition-produced silicon is dramatically enhanced by annealing at temperatures in the range of from °C to °C. Chemical vapor deposited silicon carbide, which is not ordinarily transmitting of infrared light, may be made transmitting through annealing at temperatures in the range of from °C to ° by: 5. Animation: 1) In theory, LIDAR lasers are scanned by firing them off a fixed mirror (top) and a rapidly rotating one (bottom). Artwork: 2) In practice, it's not quite so clunky, and modern LIDARs tend to use very small microscopic mirrors based on MEMS technology.

    The individual topics addressed include: solid state lasers for the mid-IR region, tunable chromium lasers, GaInAsSb/AlGaAsSb injection lasers for remote sensing applications, development and design of an airborne autonomous wavemeter for laser tuning, fabrication of lightweight Si/SiC lidar mirrors, low-cost double heterostructure and quantum.   This invention relates to a process for fabricating lightweight ceramic mirrors and, more particularly, to the fabrication of lightweight silicon/silicon carbide (Si/SiC) mirrors by means of a chemical vapor deposition process.

    lightweight ceramic mirrors and, more particularly, to the fabrication of lightweight silicon/silicon carbide (Si/SiC) mirrors by means of a chemical vapor deposi- tion process. 2. Description of the Prior Art In the field of optics, light detection and ranging (LIDAR) has come to be recognized as an important. However, working in conjunction a material provider, and using deterministic finishing techniques for the rapid fabrication of lightweight silicon carbide optics, ZYGO can produce high-quality SiC mirrors in a much shorter time as compared to traditional techniques.


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Fabrication of lightweight Si/SiC LIDAR mirrors by Jitendra Singh Goela Download PDF EPUB FB2

Small models of light-weighted Si/SiC LIDAR mirrors have been fabricated via a scalable and cost effective chemical vapor deposition process.

These mirrors are about cm in diameter and consist of a Si cladded SiC faceplate and a light-weighted structure made of SiC. The light-weighted structure consists of an outer hexagonal cell with six (6) triangular inner by: 7.

Small models (cm dia.) of lightweight Si/SiC mirrors have been fabricated via a scalable chemical vapor deposition process. These mirrors consist of a low f-number (f/), concave faceplate of SiC coated with CVD Si, and a lightweight back-up structure made of by: 8.

{{Citation | title=Fabrication of lightweight Si/SiC LIDAR mirrors [microform] / Jitendra S. Goela and Raymond L. Taylor | author1=Goela, Jitendra Singh, | author2=Taylor, Raymond L | author3=United States. National Aeronautics and Space Administration. A new, chemical vapor deposition (CVD) process was developed for fabricating lightweight, polycrystalline silicon/silicon-carbide (Si/SiC) mirrors.

The process involves three CVD steps: (1) to produce the mirror faceplate; (2) to form the lightweight backstructure, which is deposited integral to the faceplate; and (3) to deposit a layer of optical-grade material, e.g., Si, onto the front.

Small models of light-weighted Si/SiC LIDAR mirrors have been fabricated via a scalable and cost effective chemical vapor deposition process.

These mirrors are about cm in diameter and consist of a Si cladded SiC faceplate and a light-weighted structure made of SiC. fabricating large, finished or near-finished Si and/or Si/SiC LIDAR mirrors via a scalable CVD process. Phase II was for a two-year duration and its objective was to further develop the CVD lightweight mirror fabrication technology and demonstrate the fabrication of a cm-dia Si/SiC lightweight LIDAR mirror.

This final report describes the R File Size: 5MB. CTE of C/SiC is low, but its thermal conductivity is still high. The manufacturing process The raw material used is a standard porous C/C rigid felt, which is made from short, randomly oriented (isotropic) carbon fibres Silicon-carbide (SiC) ceramic mirrors and structures are becoming increasingly important for lightweight opto-mechanical File Size: KB.

These mirrors consist of a faceplate of either Si or Si-coated SiC and a lightweight backstructure made of either Si or SiC.

The mirrors were polished to a figure better than 1/5th of a wave at 0. SiC substrates, provide an active option for mirrors up to m • “Superpolished Si/SiC Mirrors” (SSMs) use SiC substrates that can be joined, then clad with Silicon, and then polished, for passive or active mirrors AHM m Proposed 4m class mirror • Passive or active • Made by casting, joining, cladding and polishing • Si clad SiC.

An up-scalable CVD process has been used to fabricate cm models of lightweight Si/SiC mirrors consisting of an f/ concave face-plate of SiC coated with CVD Si, in conjunction with a lightweight backup structure of SiC.

Due to CVD chamber fabrication, no bonding agent was required to attach the SiC backup structure to the : Jitendra Singh Goela and Raymond L. Taylor. An up-scalable CVD process has been used to fabricate cm models of lightweight Si/SiC mirrors consisting of an f/ concave face-plate of SiC coated with CVD Si, in conjunction with a lightweight backup structure of SiC.

Due to CVD chamber fabrication, no bonding agent was required to attach the SiC backup structure to the face-plate. But Silicon carbide (SiC) has been judged one of the best materials available for space-borne optical mirrors because of its outstanding thermal and mechanical properties.

As an example, SiC is used as the material of the m primary mirror of Herschel Space Observatory [18].Cited by: 1. Silicon carbide ceramic has many attributes including high strength and stiffness, low thermal expansion coefficient, high thermal conductivity, low density and good resistant for radiation of space particles.

These attributes make SiC ceramic becoming the third generation space mirror material. This paper describes the fabrication of lightweight SiC mirror by: 2.

Fabrication of lightweight Si/SiC LIDAR mirrors / By Jitendra S. (Jitendra Singh) Goela, Raymond L Taylor and Morton International Inc./CVD Incorporated. Abstract. Prepared at Morton International Inc./CVD Incorporated for Langley Research Center under Contract NASBibliography: p.

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PROCEEDINGS VOLUME Space Optical Materials and Space Qualification of Optics Large Scale Fabrication Of Lightweight Si/SiC LIDAR Mirrors Author(s): Jitendra Singh Goela; Raymond L.

Taylor Thermal Effects On Beryllium Mirrors Author(s): Shep Weinswig Show Abstract. Infrared Background Signature Survey Experiment (IBSS) Test Results. Introduction. Silicon carbide (SiC) ceramic is the most prospective candidate material for space-based lightweight optical mirror [ [1], [2], [3] ], owing to its low density, high stiffness, low thermal expansion, high optical quality, and excellent dimensional stability.

Jitendra. Goela. Dow Chemical Company | DOW. Fabrication of lightweight Si/SiC LIDAR mirrors. Large Scale Fabrication of Lightweight Si/SiC LIDAR Mirrors. Article.

Optical fabrication of lightweighted 3D printed mirrors Harrison Herzog 1, Jacob Segal 2, Jeremy Smith 2, Richard Bates 1, Jacob Calis 1, Alyssa De La Torre 3, Dae Wook Kim 2, Joni Mici 4, Jorge Mireles 5, David M.

Stubbs 4, Ryan Wicker 5 1 Department of Mechanical Engineering, Univ ersity of Arizona, Tucson, AZ USA, 2 College of Optical Sciences, University of Arizona, Tucson, AZ USA, Get this from a library.

Fabrication of lightweight Si/SiC LIDAR mirrors. [Jitendra S Goela; Raymond L Taylor; United States. National Aeronautics and Space Administration. Scientific and Technical Information Program.; Morton International Inc./CVD Incorporated.; Langley Research Center.].

methods being investigated to help eliminate risk. Mirror structural substrates made out of advanced engineered materials (far term solutions) such as composites, foams, and microsphere arrays for ultra lightweighting will also be briefly discussed.

Keywords: large lightweight mirrors, space based mirrors, materials and processes, SiC mirrors. by: 4.h “Ulta-Lightweighted C/SiC Mirrors and Structures” ESA, bulle august Larry Stepp “Silicon Carbide Tertiary Mirror for TMT” May,17, E. Tobin, M. Magida, S. Kishner and M. Krim “Design, Fabrication, and Test of a Meter-Class Reaction Bonded SiC Mirror Blank”, SPIE Vol.

File Size: KB.Mirrors are detected by utilizing the property of mirror symmetry. Spatiotemporal information is integrated using a Bayesian filter. The proposed approach can be seamlessly integrated into the occupancy grid map representation and the mobile robot localization framework, and has been demonstrated using real data from a by: