title: Photothermal detection of trace optical absorption in water by use of visible-light-emitting diodes.
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(-1) at 478 and 658 nm and 3 x 10(-4) cm(-1) at 524 nm. The magnitude and form of meniscus deflection signals were shown to be in good agreement with theory.
authors.forename: J
authors.initials: J
authors.lastname: Hodgkinson
authors.forename: M
authors.initials: M
authors.lastname: Johnson
authors.forename: J P
authors.initials: JP
authors.lastname: Dakin