Subaperture Stitching Interferometry for Large Convex Aspheric Surfaces Project

Description

The size and accuracy specifications of telescope mirrors are ever more demanding. This is particularly true for secondary mirrors, as they are convex and thus require large-aperture optics to test them. Recent NASA programs, such as the Terrestrial Planet Finder (TPF) and James Webb Space Telescope (JWST), include monolithic secondary mirrors of significant size (larger than half a meter). Secondary mirrors of such large sizes are difficult and expensive to test due to the large-aperture converging and nulling optics required. Furthermore, calibration of these optics to the level required for next-generation programs is extremely challenging. Subaperture stitching has the potential to provide accurate high-resolution maps of large-aperture aspheric optics without the use of even larger aperture optics or dedicated nulls. QED's Subaperture Stitching Interferometer (SSI<SUP>REG</SUP>) has achieved nanometer-level accuracies on spherical optics with its novel compensation techniques. Non-null capability is enhanced since the individual subapertures have significantly less aspheric departure. However, the system is currently only capable of testing up to 280 mm optics of mild asphericity. Phase I work demonstrated that the technology is scalable to larger aperture sizes. This proposal focuses on innovations for leveraging the considerable benefits of stitching (high resolution, automatic calibration, and flexible aspheric testing) to aspheric optics. Activities will include uncertainty analyses of aspheric tests, subscale measurement demonstrations, and development of concepts for testing larger amounts of aspheric departure.

General Information

• This data is described at

  http://catalog.data.gov/dataset/subaperture-stitching-interferometry-for-large-convex-aspheric-surfaces-project-4d1a2 Do you think this data is incorrect? Let us know

• This data is published by

  National Aeronautics and Space Administration Do you think this data is incorrect? Let us know

Legal Information

• The rights statement is at

  http://catalog.data.gov/dataset/subaperture-stitching-interferometry-for-large-convex-aspheric-surfaces-project-4d1a2 Do you think this data is incorrect? Let us know

• Outside the US, this data is available under

  Creative Commons CCZero Do you think this data is incorrect? Let us know

• There are

  yes, and the rights are all held by the same person or organisation Do you think this data is incorrect? Let us know

• The content is available under

  Creative Commons CCZero Do you think this data is incorrect? Let us know

• The rights statement includes data about

  its data licence Do you think this data is incorrect? Let us know

• This data contains

  no data about individuals Do you think this data is incorrect? Let us know

Practical Information

• The data appears in this collection

  http://catalog.data.gov/organization/nasa-gov Do you think this data is incorrect? Let us know

• The accuracy or relevance of this data will

  go out of date but it is timestamped Do you think this data is incorrect? Let us know

• The data is

  backed up offsite Do you think this data is incorrect? Let us know

Technical Information

• This data is published at

  http://techport.nasa.gov/xml-api/6187 Do you think this data is incorrect? Let us know

• This data is

  machine-readable Do you think this data is incorrect? Let us know

• The format of this data is

  a standard open format Do you think this data is incorrect? Let us know

Social Information

• The documentation includes machine-readable data for

  title Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  description Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  identifier Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  landing page Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  publisher Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  keyword(s) or tag(s) Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  distribution(s) Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  release date Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  modification date Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  temporal coverage Do you think this data is incorrect? Let us know

• The documentation includes machine-readable data for

  language Do you think this data is incorrect? Let us know

• The documentation about each distribution includes machine-readable data for

  release date Do you think this data is incorrect? Let us know

• The documentation about each distribution includes machine-readable data for

  a URL to access the data Do you think this data is incorrect? Let us know

• The documentation about each distribution includes machine-readable data for

  a URL to download the dataset Do you think this data is incorrect? Let us know

• The documentation about each distribution includes machine-readable data for

  type of download media Do you think this data is incorrect? Let us know

• Find out how to contact someone about this data at

  http://catalog.data.gov/dataset/subaperture-stitching-interferometry-for-large-convex-aspheric-surfaces-project-4d1a2 Do you think this data is incorrect? Let us know

• Find out how to suggest improvements to publication at

  http://www.data.gov/issue/?media_url=http://catalog.data.gov/dataset/subaperture-stitching-interferometry-for-large-convex-aspheric-surfaces-project-4d1a2 Do you think this data is incorrect? Let us know