Photothermal detection of trace optical absorption in water by use of visible-light-emitting diodes

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dc.contributor.author Hodgkinson, Jane
dc.contributor.author Johnson, Mark
dc.contributor.author Dakin, John P.
dc.date.accessioned 2010-03-17T11:51:46Z
dc.date.available 2010-03-17T11:51:46Z
dc.date.issued 1998
dc.identifier.citation Hodgkinson J, Johnson M, Dakin V. (1998) Photothermal detection of trace optical absorption in water by use of visible-light-emitting diodes. Applied Optics, Volume 37, Issue 31, pp. 7320-7326 en_UK
dc.identifier.issn 0003-6935
dc.identifier.uri http://dx.doi.org/10.1364/AO.37.007320
dc.identifier.uri http://hdl.handle.net/1826/4296
dc.description.abstract Visible light emitting diodes of three different colors have been used to detect an absorbing compound (potassiumpermanganate) in trace quantities in aqueous solution. Photothermal absorption in a closed cell caused deflection of a water meniscus held at a small pinhole. The displacement was monitored using optical fiber interferometry. The technique was limited by LED emission intensities and environmental acoustic noise, giving minimum detectable absorption coefficients of 2x10-4 cm-1 at 478 nm and 658 nm, and 3x10-4 cm-1 at 524 nm. The magnitude and form of meniscus deflection signals were shown to be in good agreement with theory. en_UK
dc.language.iso en en_UK
dc.publisher Optical Society of America en_UK
dc.title Photothermal detection of trace optical absorption in water by use of visible-light-emitting diodes en_UK
dc.type Article en_UK


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