High contrast thermal deflectometry using long-wave infrared time modulated integrating cavity source
AffiliationUniv Arizona, Steward Observ
Univ Arizona, James C Wyant Coll Opt Sci
Univ Arizona, Dept Astron
MetadataShow full item record
PublisherOPTICAL SOC AMER
CitationLogan R. Graves, Henry Quach, R. John Koshel, Chang-Jin Oh, and Dae Wook Kim, "High contrast thermal deflectometry using long-wave infrared time modulated integrating cavity source," Opt. Express 27, 28660-28678 (2019)
RightsCopyright © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractWe introduce a scalable temporally modulated long-wave infrared source design. The design makes use of an array of resistive blackbody heating elements which radiate into a custom aluminum integrating cavity. The output of the box is a rectangular slit, built to match the traditional tungsten ribbon profile for an infrared deflectometry source. Temporal modulation allows for signal isolation and improved resilience to background fluctuations in an infrared deflectometry source. Infrared deflectometry measurements using the new source design and a traditional tungsten ribbon, both with similar radiant flux, were compared for a ground glass surface, an aluminum blank, and an aluminum blank under thermal load (150 °C). Signal-to-noise ratio was ∼4 times higher for the new design and demonstrated improved source temporal stability and geometry. Further, the new design successfully measured the previously untestable hot aluminum flat. The new design improves infrared deflectometry and allows for high contrast thermal deflectometry measurements of optics under thermal load.
NoteOpen access journal
VersionFinal published version