Detection of nitric oxide by ultraviolet diode laser absorption spectrometry: Comparison between direct absorption techniques and wavelength modulation spectrometry
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
An evaluation of the detectability of a fully diode laser based system for detection of nitric oxide (NO) by different techniques, i.e. direct absorption (DAS), differential direct absorption (DDAS) and wavelength modulation spectroscopy (WMS), in the UV-region is presented. The laser system is targeting a strong electronic transition of NO at wavelengths around 226.6 nm. The system performance and stability has been assessed by measuring its Allan deviation. It has been shown that the sensitivity of WMS is one order of magnitude higher than that of the DAS and DDAS. The WMS 1-σ detectability is as low as 9 ppb∙m, while those for DAS and DDAS are 54 ppb∙m and 120 ppb∙m, respectively.
Place, publisher, year, edition, pages
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:umu:diva-117142OAI: oai:DiVA.org:umu-117142DiVA: diva2:905519
Subject / course
Fysik D - examensarbete