Enhanced ORCA and CLARREO Depolarizers Using AR Microstructures, Phase I

Metadata Updated: February 28, 2019

Next generation Earth Science Satellites ORCA and CLARREO are designed to measure our planet's ocean and climate health. Using hyper-spectral imaging at wavelengths ranging from the UV through NIR, these instruments will record the levels of the earth's temperature rise over the course of a decade. To make such detailed measurements, polarization effects at various wavelengths due to multiple factors must be eliminated using an optical device known as a "de-polarizer". For the CLARREO de-polarizer, four quartz windows are needed to randomize the polarization state of the observed reflected light spectrum. Multiple reflections from 4 surfaces produce losses up to 14% of the incident light, a level high enough to produce "ghost" effects superimposed on the desired earth images resulting in reduced image contrast and greater measurement error. An anti-reflection (AR) treatment is needed that can withstand the radiation and temperature effects caused by the mission environment while reducing reflection losses to levels of fractions of one percent. A new type of AR treatment, being developed for many military and commercial applications, is based on surface relief microstructures fabricated directly in a window, optic, or sensor material. AR microstructures (ARMs) can suppress internal reflections to levels unattainable by conventional thin-film AR coating technology. To extend the performance benefits of ARMs to hyper-spectral imaging systems, it is proposed that the fabrication processes developed for fused silica, glass, silicon, and many other optical materials be adapted for use with the quartz and magnesium fluoride depolarizers planned for the ORCA and CLARREO missions. In addition, an investigation of innovative surface microstructure technology is proposed for the fabrication of a new type of non-scattering, micro-textured depolarizer with inherent AR properties that can be applied to multiple optical elements within a spectrometer system.

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

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Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019

Metadata Source

Harvested from NASA Data.json

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Resource Type Dataset
Metadata Created Date August 1, 2018
Metadata Updated Date February 28, 2019
Publisher Space Technology Mission Directorate
Unique Identifier TECHPORT_9174
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
Harvest Object Id b21e5e7f-3abc-4be5-af52-e2082d693306
Harvest Source Id 39e4ad2a-47ca-4507-8258-852babd0fd99
Harvest Source Title NASA Data.json
Data First Published 2011-09-01
Homepage URL https://techport.nasa.gov/view/9174
License http://www.usa.gov/publicdomain/label/1.0/
Data Last Modified 2018-07-20
Program Code 026:027
Source Datajson Identifier True
Source Hash bdc6f1411628db77dec0b53504960ccafbcf8557
Source Schema Version 1.1

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