Holographic Sensor
AssigneeDublin Institute of Technology
InventorsIzabela Naydenova, Hosam Sherif, Suzanne Martin, Raghavendra Jallapuram, Vincent Toal
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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.
Claims47
1-90. (canceled)
A sensor device comprising a holographic element comprising 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 moisture content of the environment exposed to the element.
A sensor device comprising a holographic element comprising a grating recorded in a holographic recording medium, wherein at least one physical and/or chemical and/or optical characteristic of the holographic element varies as a result of variation in an environmental property.
An acrylamide based photopolymer material incorporating a monomer, a cross-linking monomer, a photosensitive dye, an initiator, and a polymeric binder, capable of forming, without treatment, development or processing following recording, a reflection hologram having a diffraction efficiency of greater than 25% percent at spatial frequencies greater than 4500 lines per mm.
A reflection hologram recorded in a dry, acrylamide based photopolymer material, the hologram having a diffraction efficiency greater than 25% at spatial frequencies greater than 4500 lines mm−1 or a diffraction efficiency of greater than 30% at spatial frequencies greater than 4500 lines mm−1.
Dependencies are inferred from the claim text.