High contrast thermal deflectometry using long-wave infrared time modulated integrating cavity source

Logan R. Graves, Henry Quach, R. John Koshel, Chang Jin Oh, Dae Wook Kim

Research output: Contribution to journalArticle

Abstract

We 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.

Original languageEnglish (US)
Pages (from-to)28660-28678
Number of pages19
JournalOptics Express
Volume27
Issue number20
DOIs
StatePublished - Sep 30 2019

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planetary waves
cavities
aluminum
blanks
ribbons
tungsten
resilience
slits
boxes
isolation
signal to noise ratios
optics
modulation
heating
glass
output
profiles
geometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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High contrast thermal deflectometry using long-wave infrared time modulated integrating cavity source. / Graves, Logan R.; Quach, Henry; John Koshel, R.; Oh, Chang Jin; Kim, Dae Wook.

In: Optics Express, Vol. 27, No. 20, 30.09.2019, p. 28660-28678.

Research output: Contribution to journalArticle

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