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.
Claims17
An acrylamide based photopolymer material incorporating a monomer, a cross-linking monomer, a photosensitive dye, an initiator, and a polymeric binder, wherein the polymeric binder is polyvinyl alcohol (PVA) with a percentage hydrolysis of about 80% and wherein photopolymer material is capable of forming, without treatment, development or processing following recording, a reflection hologram having a diffraction efficiency of up to 30% at a spatial frequency of 4600 lines per mm.
An acrylamide based photopolymer material incorporating a PVA binder having a percentage hydrolysis of about 80% and a molecular weight of less than about 30,000, a monomer, a cross-linking monomer, a photosensitive dye, and an initiator, wherein the photopolymer material is capable of forming, without treatment, development or processing following recording, a reflection hologram having a diffraction efficiency of up to 30% at a spatial frequency of 4600 lines per mm.
Dependencies are inferred from the claim text.