Photothermal detection of trace optical absorption in water using visible light emitting diodes
Photothermal detection of trace optical absorption in water using visible light emitting diodes
Visible-light-emitting diodes of three different colors have been used to detect an absorbing compound (potassium permanganate) 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 with optical-fiber interferometry. The technique was limited by LED emission intensities and environmental acoustic noise, giving minimum detectable absorption coefficients of 2 x 10-4/cm at 478 and 658nm and 3 x 10-4/cm at 524 nm. The magnitude and form of meniscus deflection signals were shown to be in good agreement with theory.
7320-7326
Hodgkinson, Jane
ccb8c8c6-a374-4e1a-9997-83cc63531f58
Johnson, Mark
3d0db830-23aa-4083-9105-5f11707959df
Dakin, John P.
04891b9b-5fb5-4245-879e-9e7361adf904
1 November 1998
Hodgkinson, Jane
ccb8c8c6-a374-4e1a-9997-83cc63531f58
Johnson, Mark
3d0db830-23aa-4083-9105-5f11707959df
Dakin, John P.
04891b9b-5fb5-4245-879e-9e7361adf904
Hodgkinson, Jane, Johnson, Mark and Dakin, John P.
(1998)
Photothermal detection of trace optical absorption in water using visible light emitting diodes.
Applied Optics, 37 (31), .
(doi:10.1364/AO.37.007320).
Abstract
Visible-light-emitting diodes of three different colors have been used to detect an absorbing compound (potassium permanganate) 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 with optical-fiber interferometry. The technique was limited by LED emission intensities and environmental acoustic noise, giving minimum detectable absorption coefficients of 2 x 10-4/cm at 478 and 658nm and 3 x 10-4/cm at 524 nm. The magnitude and form of meniscus deflection signals were shown to be in good agreement with theory.
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Published date: 1 November 1998
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Local EPrints ID: 77842
URI: http://eprints.soton.ac.uk/id/eprint/77842
ISSN: 0003-6935
PURE UUID: 7657a54e-5680-4085-a121-3d5eb9f5b83e
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Date deposited: 11 Mar 2010
Last modified: 14 Mar 2024 00:00
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Author:
Jane Hodgkinson
Author:
Mark Johnson
Author:
John P. Dakin
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