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Planar waveguide water state sensor allowing detection of supercooling

Planar waveguide water state sensor allowing detection of supercooling
Planar waveguide water state sensor allowing detection of supercooling
A sensor believed to be the first truly integrated optical sensor demonstrating the detection of the liquid-solid phase transition of water is presented. The condensation, freezing, melting and evaporation of water are all detected with a planar silica Bragg grating operating in the 1.5 micron telecommunications window. Additionally, use of the sensor allows recognition of supercooled liquid at temperatures below the melting point of water.

The device is fabricated by direct UV writing with simultaneous definition of the grating, a method inherently suited to integration with other technologies. The Bragg grating is exposed and water is allowed to condense over it. Interaction with the evanescent field causes small changes in effective index (5x10-6) which can be detected, a sufficient sensitivity to identify the phase transitions of water clearly.
Sparrow, I.J.G.
3b11b080-98d5-41fe-8e15-bc12d17dc259
Emmerson, G.D.
89517051-daed-4f8e-aca6-f686d8c54e7c
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
ECIO 2005
Sparrow, I.J.G.
3b11b080-98d5-41fe-8e15-bc12d17dc259
Emmerson, G.D.
89517051-daed-4f8e-aca6-f686d8c54e7c
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6

Sparrow, I.J.G., Emmerson, G.D. and Smith, Peter G.R. (2005) Planar waveguide water state sensor allowing detection of supercooling. 12th European Conference on Integrated Optics. ECIO 2005. 06 - 08 Apr 2005. 4 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

A sensor believed to be the first truly integrated optical sensor demonstrating the detection of the liquid-solid phase transition of water is presented. The condensation, freezing, melting and evaporation of water are all detected with a planar silica Bragg grating operating in the 1.5 micron telecommunications window. Additionally, use of the sensor allows recognition of supercooled liquid at temperatures below the melting point of water.

The device is fabricated by direct UV writing with simultaneous definition of the grating, a method inherently suited to integration with other technologies. The Bragg grating is exposed and water is allowed to condense over it. Interaction with the evanescent field causes small changes in effective index (5x10-6) which can be detected, a sufficient sensitivity to identify the phase transitions of water clearly.

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More information

Published date: 2005
Additional Information: Publication No: 3113
Venue - Dates: 12th European Conference on Integrated Optics. ECIO 2005, 2005-04-06 - 2005-04-08

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Local EPrints ID: 38306
URI: https://eprints.soton.ac.uk/id/eprint/38306
PURE UUID: ae693f43-0787-41e6-9cc8-a7f5993dc180

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Date deposited: 07 Jun 2006
Last modified: 17 Jul 2017 15:39

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