Photothermal detection of trace optical absorption in water by use of visible-light-emitting diodes
| dc.contributor.author | Hodgkinson, Jane | |
| dc.contributor.author | Johnson, Mark | |
| dc.contributor.author | Dakin, John P. | |
| dc.date.accessioned | 2010-03-17T11:51:46Z | |
| dc.date.available | 2010-03-17T11:51:46Z | |
| dc.date.issued | 1998 | |
| dc.description.abstract | Visible light emitting diodes of three different colors have been used to detect an absorbing compound (potassiumpermanganate) 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 using optical fiber interferometry. The technique was limited by LED emission intensities and environmental acoustic noise, giving minimum detectable absorption coefficients of 2x10-4 cm-1 at 478 nm and 658 nm, and 3x10-4 cm-1 at 524 nm. The magnitude and form of meniscus deflection signals were shown to be in good agreement with theory. | en_UK |
| dc.identifier.citation | Hodgkinson J, Johnson M, Dakin V. (1998) Photothermal detection of trace optical absorption in water by use of visible-light-emitting diodes. Applied Optics, Volume 37, Issue 31, pp. 7320-7326 | en_UK |
| dc.identifier.issn | 0003-6935 | |
| dc.identifier.uri | http://dx.doi.org/10.1364/AO.37.007320 | |
| dc.identifier.uri | http://hdl.handle.net/1826/4296 | |
| dc.language.iso | en | en_UK |
| dc.publisher | Optical Society of America | en_UK |
| dc.title | Photothermal detection of trace optical absorption in water by use of visible-light-emitting diodes | en_UK |
| dc.type | Article | en_UK |