Holographic gratings recorded in polymer hydrogels - an original application as a sensor in aqueous environment

Reports an application in which a holographic grating recorded in a polymer hydrogel is used as a salinity sensor. The degree of swelling of a polymer hydrogel depends on the aqueous solution in which it is immersed, among other factors. When a volume phase hologram is engraved in a hydrogel film, t...

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Bibliographic Details
Published in:Measurement science & technology 1997-09, Vol.8 (9), p.997-1000
Main Authors: Ley, C, Calderara, I, Lougnot, D J
Format: Article
Language:English
Subjects:
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Hologram recording and read-out methods
Holographic recording materials
optical storage media
Holography
Optical materials
Optics
Physics
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Summary:Reports an application in which a holographic grating recorded in a polymer hydrogel is used as a salinity sensor. The degree of swelling of a polymer hydrogel depends on the aqueous solution in which it is immersed, among other factors. When a volume phase hologram is engraved in a hydrogel film, the dependence of its diffraction efficiency on osmosis in saline solution can be used as a probe for measuring the concentration of the solute. In this application, the cross linked mixture contained 29.4 wt% methyl methacrylate, 70.4 wt% vinylpyrrolidone, 0.05 wt% triethyleneglycoldimethacrylate and 0.15 wt% triallylisocyanurate. Experiments are under way to investigate a wide range of solutes. As an example, the sensitivity of the technique is better than 20 mg dm\+sp\-3\-sp\ of KBr. (Abstract quotes from original text)
ISSN:0957-0233
1361-6501
DOI:10.1088/0957-0233/8/9/007