Formaldehyde sensor using non-dispersive UV spectroscopy at 340nm

Show simple item record Davenport, John - Hodgkinson, Jane - Saffell, John R. - Tatam, Ralph P. -
dc.contributor.editor Berghmans, F. -
dc.contributor.editor Mignani, A. G. -
dc.contributor.editor De Moor, P. - 2014-09-02T04:01:53Z 2014-09-02T04:01:53Z 2014-05-22T00:00:00Z -
dc.identifier.citation J. J. Davenport, J. Hodgkinson, J. R. Saffell, R. P. Tatam, Formaldehyde sensor using non-dispersive UV spectroscopy at 340nm, Proceedings of Optical Sensing and Detection III, volume 9141, held in 14th April, Brussels, Belgium, Proceedings of SPIE 9141, 91410K (May 15, 2014).
dc.identifier.isbn 9781628410891 -
dc.identifier.issn 0277-786X -
dc.identifier.uri -
dc.description.abstract Formaldehyde is a volatile organic compound that exists as a gas at room temperature. It is hazardous to human health causing irritation of the eyes, nose and throat, headaches, limited pulmonary function and is a potential human carcinogen. Sources include incomplete combustion, numerous modern building materials and vehicle fumes. Here we describe a simple method for detecting formaldehyde using low resolution non-dispersive UV absorption spectroscopy for the first time. A two channel system has been developed, making use of a strong absorption peak at 339nm and a neighbouring region of negligible absorption at 336nm as a reference. Using a modulated UV LED as a light source and narrowband filters to select the desired spectral bands, a simple detection system was constructed that was specifically targeted at formaldehyde. A minimum detectable absorbance of 4.5 × 10-5 AU was estimated (as ΔI/I0), corresponding to a limit of detection of approximately 6.6 ppm for a 195mm gas cell, with a response time of 20s. However, thermally-induced drift in the LED spectral output caused this to deteriorate over longer time periods to around 30 ppm or 2 × 10-4 AU en_UK
dc.publisher International Society for Optical Engineering; 1999 en_UK
dc.rights Copyright 2014 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
dc.title Formaldehyde sensor using non-dispersive UV spectroscopy at 340nm en_UK
dc.type Conference paper -

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