期刊
APPLIED PHYSICS B-LASERS AND OPTICS
卷 122, 期 8, 页码 -出版社
SPRINGER
DOI: 10.1007/s00340-016-6486-9
关键词
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资金
- Chemical and Biological Metrology Programme of the UK Department for Business, Innovation and Skills (BIS)
- European Metrology Research Programme (EMRP) of the European Union
- EMRP within EURAMET
- European Union
A correction for the undesirable effects of direct and indirect cross-interference from water vapour on ammonia (NH3) measurements was developed using an optical laser sensor based on cavity ring-down spectroscopy. This correction relied on new measurements of the collisional broadening due to water vapour of two NH3 spectral lines in the near infra-red (6548.6 and 6548.8 cm(-1)), and on the development of novel stable primary standard gas mixtures (PSMs) of ammonia prepared by gravimetry in passivated gas cylinders at 100 mu mol mol(-1). The PSMs were diluted dynamically to provide calibration mixtures of dry and humidified ammonia atmospheres of known composition in the nmol mol(-1) range and were employed as part of establishing a metrological traceability chain to improve the reliability and accuracy of ambient ammonia measurements. The successful implementation of this correction will allow the extension of this rapid on-line spectroscopic technique to exposure chamber validation tests under controlled conditions and ambient monitoring in the field.
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