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

摘要

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. (C) 1998 Optical Society of America OCIS codes: 010.7340, 060.2370, 120.3180, 230.3670, 300.1030, 300.6430. [References: 8]