Measuring NO and temperature in plasma preheated air using UV absorption spectroscopy
2020 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 126, no 6, article id 100Article in journal (Refereed) Published
Abstract [en]
A new fast sensor for simultaneous high temperature diagnostics (above 800 K) of nitrogen oxide (NO) concentration and gas temperature (T) was developed based on the spectral fitting of low-resolution NO UV absorption near 226 nm. The sensor was intended for process control in future low-carbon footprint heavy process industries using renewable powered electro fuels (e.g. H2, NH3) or plasma torches as heat source. Due to excitation of molecular vibration, the shape of the selected NO feature, including (0, 0), (1, 1), and (2, 2) vibrational transitions of the A2Σ+ − X2Π2 electronic system had a strong temperature sensitivity at temperatures above 800 K. The fitting was made using the well-known NO molecular constants of the A2Σ+ − X2Π2 electronic system. To reduce the computational time, a library of the molecular spectra calculated at different temperatures was created. The fitting of an experimental spectrum representing the convolution of the instrument line function of the spectrometer with the molecular spectra was performed using the pre-calculated library spectra. Based on comparison with conventional measurement methods, the accuracy of the developed sensor was within 15% for NO and about 40 K for T, clearly showing the potential for fast in situ diagnostics in hot process gases. © 2020, The Author(s).
Place, publisher, year, edition, pages
Springer , 2020. Vol. 126, no 6, article id 100
Keywords [en]
Absorption spectra, Ammonia, Carbon footprint, Light absorption, Mass spectrometry, Molecular spectroscopy, Nitrogen oxides, Spectrometers, Computational time, Conventional measurements, Experimental spectra, Molecular constants, Process industries, Temperature sensitivity, UV absorption spectroscopy, Vibrational transitions, Absorption spectroscopy
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-45079DOI: 10.1007/s00340-020-07451-2Scopus ID: 2-s2.0-85084914824OAI: oai:DiVA.org:ri-45079DiVA, id: diva2:1441164
Note
Funding details: Energimyndigheten; Funding text 1: Open access funding provided by RISE Research Institutes of Sweden. This work has been conducted as part of the HYBRIT research project RP1. We gratefully acknowledge financial support from the Swedish Energy Agency. HYBRIT (Hydrogen Breakthrough Ironmaking Technology) is a joint initiative of the three companies SSAB, LKAB, and Vattenfall with the aim of developing the world’s first fossil-free ore-based steelmaking route.
2020-06-152020-06-152023-05-19Bibliographically approved