Non-dispersive ultra-violet spectroscopic detection of formaldehyde gas for indoor environments
dc.contributor.author | Davenport, J. J. | |
dc.contributor.author | Hodgkinson, Jane | |
dc.contributor.author | Saffell, J. R. | |
dc.contributor.author | Tatam, Ralph P. | |
dc.date.accessioned | 2018-02-08T16:35:56Z | |
dc.date.available | 2018-02-08T16:35:56Z | |
dc.date.issued | 2018-01-25 | |
dc.description.abstract | We describe a simple method for detecting formaldehyde using low resolution non-dispersive UV absorption spectroscopy. A two channel sensor was developed, making use of a strong absorption peak at 339 nm and a neighbouring region of negligible absorption at 336 nm as a reference. Using a modulated UV LED as a light source and narrow laser-line filters to select the desired spectral bands, a simple detection system was constructed specifically targeted at formaldehyde. By paying particular attention to sources of noise, a minimum detectable absorbance of 5×10 -5 AU was demonstrated with a 20 s averaging period (as ΔI/I0). The system was tested with formaldehyde finding a limit of detection of 4.3 ppm for a 195 mm gas cell. As a consequence of the low gas flow rates used in our test system, a time period of over 8 min was used in further tests, which increased the minimum detectable absorbance to 2×10 -4 AU, 17 ppm of formaldehyde. The increase was the result of thermal drift caused by unwanted temperature variation of the UV LED and the filters, resulting in a zero uncertainty estimated at 560 ppm °C -1 and 100ppm °C -1 respectively. | en_UK |
dc.identifier.citation | Davenport JJ, Hodgkinson J, Saffell JR, Tatam RP. (2018) Non-dispersive ultra-violet spectroscopic detection of formaldehyde gas for indoor environments. IEEE Sensors Journal, Volume 18, issue 6, March 2018, pp. 2218-2228 | en_UK |
dc.identifier.issn | 1530-437X | |
dc.identifier.uri | http://dx.doi.org/10.1109/JSEN.2018.2795042 | |
dc.identifier.uri | https://dspace.lib.cranfield.ac.uk/handle/1826/12973 | |
dc.language.iso | en | en_UK |
dc.publisher | IEEE | en_UK |
dc.rights | Attribution 3.0 International | * |
dc.rights.uri | http://creativecommons.org/licenses/by/3.0/ | * |
dc.subject | gas detectors | en_UK |
dc.subject | light emitting diodes | en_UK |
dc.subject | optical sensors | en_UK |
dc.subject | pollution measurement | en_UK |
dc.subject | spectroscopy | en_UK |
dc.subject | ultraviolet sources | en_UK |
dc.title | Non-dispersive ultra-violet spectroscopic detection of formaldehyde gas for indoor environments | en_UK |
dc.type | Article | en_UK |
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