Cryogenic Active Mirrors

Metadata Updated: May 2, 2019

This effort seeks to develop active mirrors that can correct for thermally-induced figure deformations upon cooling from room-temperature at the time of manufacture, down to cryogenic temperatures (4K) during operation. [HTML_REMOVED]To do so, an array of piezoelectric actuators are distributed across the backside of a lightweighted silicon carbide substrate in a surface-parallel fashion. [HTML_REMOVED]Each actuator can [HTML_REMOVED]push[HTML_REMOVED] or [HTML_REMOVED]pull[HTML_REMOVED] on the surface through the application of an electric field. [HTML_REMOVED]This actuation scheme has been performed for room temperature mirrors, however it has yet to be demonstrated at cryogenic temperatures. [HTML_REMOVED]This is the primary focus of the current effort. The primary goal of the Cryogenic Active Mirror (CAM) technology development effort was to demonstrate comparable active figure control at room and cryogenic temperatures. [HTML_REMOVED]This was performed experimentally by constructing a small-scale demonstrator mirror and subjecting it to cryogenic temperatures in a thermal-vacuum chamber. [HTML_REMOVED]This test provided a comparison of actuation stroke and figure correctability at both temperatures. [HTML_REMOVED]The second objective of this effort was to establish a point design for a 4x6m active aperture for a notional Far-IR telescope [HTML_REMOVED]This was performed using a finite element model (FEM), along with results from the experimental campaign. [HTML_REMOVED]In doing so, predictions on mirror stiffness, mass, and ability to correct for gravity sag and thermal deformations was established. [HTML_REMOVED]Finally, the last objective was to explore new methods of actuation that require zero voltage to maintain their specific actuation state. [HTML_REMOVED]This was performed by material characterization of piezoelectric materials at reduced temperatures.

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Public: This dataset is intended for public access and use. License: U.S. Government Work

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Dates

Metadata Created Date August 1, 2018
Metadata Updated Date May 2, 2019

Metadata Source

Harvested from NASA Data.json

Additional Metadata

Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date May 2, 2019
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_90755
Maintainer
TECHPORT SUPPORT
Maintainer Email
Public Access Level public
Bureau Code 026:00
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://data.nasa.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Datagov Dedupe Retained 20190501230127
Harvest Object Id 92d65542-4779-4457-bfc0-cfe8f56b95c8
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2016-09-01
Homepage URL https://techport.nasa.gov/view/90755
License http://www.usa.gov/publicdomain/label/1.0/
Data Last Modified 2018-07-19
Program Code 026:027
Source Datajson Identifier True
Source Hash 661566d8266b4c44531a48febf6314abad54c095
Source Schema Version 1.1

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