Edwards, C S; Barwood, G P; Gill, P; Bell, S A; Stevens, M; Schirmer, B*; Melling, A*; Venzke, H*; Weber, H*; Benyon, R*; Mackrodt, P*; Nielsen, J*; de Groot, M J*; Pusterla, L* (2001) Development and evaluation of a tunable diode laser absorption spectrometer for trace humidity measurements. In: TEMPMEKO 01, June 2001, Berlin, Germany.

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Abstract

A tunable diode laser absorption spectrometer has been developed and evaluated by a European consortium. The spectrometer uses a distributed feedback diode laser to access a strong water vapour absorption at 1393nm. In tests over the humidity range 1ppmv, the system showed a reproducibility of ±5%. The minimum detection sensitivity was estimated to be 25 ppmv. In addition, the dynamic response of the system was investigated, as well as its cross-sensitivity to other gas species including N2, He and CH4. After modification to electronics, a reproducibility of 12ppmb was observed in the range 15ppbv to 1ppmv over a 3-month period.

Item Type:	Conference or Workshop Item (UNSPECIFIED)
Subjects:	Engineering Measurements Engineering Measurements > Thermal
Last Modified:	02 Feb 2018 13:17
URI:	https://eprintspublications.npl.co.uk/id/eprint/2873