Formaldehyde sensor using non-dispersive UV spectroscopy at 340nm
| dc.contributor.author | Davenport, John | - |
| dc.contributor.author | Hodgkinson, Jane | - |
| dc.contributor.author | Saffell, John R. | - |
| dc.contributor.author | Tatam, Ralph P. | - |
| dc.contributor.editor | Berghmans, F. | - |
| dc.contributor.editor | Mignani, A. G. | - |
| dc.contributor.editor | De Moor, P. | - |
| dc.date.accessioned | 2014-09-02T04:01:53Z | |
| dc.date.available | 2014-09-02T04:01:53Z | |
| dc.date.issued | 2014-05-22T00:00:00Z | - |
| 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.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 | http://dx.doi.org/10.1117/12.2052460 | - |
| dc.identifier.uri | http://dspace.lib.cranfield.ac.uk/handle/1826/8668 | |
| 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 | - |