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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
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.
0003-6935
7320-7326
Hodgkinson, Jane
ccb8c8c6-a374-4e1a-9997-83cc63531f58
Johnson, Mark
3d0db830-23aa-4083-9105-5f11707959df
Dakin, John P.
04891b9b-5fb5-4245-879e-9e7361adf904
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), 7320-7326. (doi:10.1364/AO.37.007320).

Record type: Article

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

Identifiers

Local EPrints ID: 77842
URI: https://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: 25 Jul 2018 16:32

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Contributors

Author: Jane Hodgkinson
Author: Mark Johnson
Author: John P. Dakin

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