Holographic sensor
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United States of America Patent
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Sep 17, 2013
Grant Date -
Nov 15, 2012
app pub date -
Jul 25, 2012
filing date -
Nov 25, 2005
priority date (Note) -
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Abstract
A sensor device comprising a holographic element comprises a grating or hologram recorded in a holographic recording medium wherein at least one physical and/or chemical and/or optical characteristic of the holographic element or the image produced by it varies as a result of variation in relative humidity or moisture content in the air surrounding the element. Also provided is an acrylamide-based photopolymer and an acrylamide-based reflection hologram.
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