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Applied Optics

Applied Optics


  • Vol. 37, Iss. 31 — Nov. 1, 1998
  • pp: 7320–7326

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

Jane Hodgkinson, Mark Johnson, and John P. Dakin  »View Author Affiliations

Applied Optics, Vol. 37, Issue 31, pp. 7320-7326 (1998)

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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 × 10-4 cm-1 at 478 and 658 nm and 3 × 10-4 cm-1 at 524 nm. The magnitude and form of meniscus deflection signals were shown to be in good agreement with theory.

© 1998 Optical Society of America

OCIS Codes
(010.7340) Atmospheric and oceanic optics : Water
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(230.3670) Optical devices : Light-emitting diodes
(300.1030) Spectroscopy : Absorption
(300.6430) Spectroscopy : Spectroscopy, photothermal

Original Manuscript: January 5, 1998
Revised Manuscript: May 12, 1998
Published: November 1, 1998

Jane Hodgkinson, Mark Johnson, and John P. Dakin, "Photothermal detection of trace optical absorption in water by use of visible-light-emitting diodes," Appl. Opt. 37, 7320-7326 (1998)

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