{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,17]],"date-time":"2026-06-17T16:42:30Z","timestamp":1781714550809,"version":"3.54.5"},"reference-count":44,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2024,4,11]],"date-time":"2024-04-11T00:00:00Z","timestamp":1712793600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Due to a rising importance of the reduction of pollutant, produced by conventional energy technologies, the knowledge of pollutant forming processes during a combustion is of great interest. In this study the in-cylinder temperature, of a near series diesel engine, is examined with a minimal invasive emission spectroscopy sensor. The soot, nearly a black body radiator, emits light, which is spectrally detected and evaluated with a modified function of Planck\u2019s law. The results show a good correlation between the determined temperatures and the NOx concentration, measured in the exhaust gas of the engine, during a variety of engine operating points. A standard deviation between 25 K and 49 K was obtained for the in-cylinder temperature measurements.<\/jats:p>","DOI":"10.3390\/s24082459","type":"journal-article","created":{"date-parts":[[2024,4,12]],"date-time":"2024-04-12T03:34:37Z","timestamp":1712892877000},"page":"2459","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Emission Spectroscopy-Based Sensor System to Correlate the In-Cylinder Combustion Temperature of a Diesel Engine to NOx Emissions"],"prefix":"10.3390","volume":"24","author":[{"given":"J\u00fcrgen","family":"Wultschner","sequence":"first","affiliation":[{"name":"Institute of Engineering Thermodynamics, University of Siegen, D-57076 Siegen, Germany"},{"name":"Center for Sensor Systems (ZESS), University of Siegen, D-57076 Siegen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-8826-2956","authenticated-orcid":false,"given":"Ingo","family":"Schmitz","sequence":"additional","affiliation":[{"name":"Institute of Engineering Thermodynamics, University of Siegen, D-57076 Siegen, Germany"},{"name":"Center for Sensor Systems (ZESS), University of Siegen, D-57076 Siegen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stephan","family":"R\u00e9vidat","sequence":"additional","affiliation":[{"name":"Hyundai Motor Europe Technical Center GmbH, D-65428 R\u00fcsselsheim, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johannes","family":"Ullrich","sequence":"additional","affiliation":[{"name":"Hyundai Motor Europe Technical Center GmbH, D-65428 R\u00fcsselsheim, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9145-5910","authenticated-orcid":false,"given":"Thomas","family":"Seeger","sequence":"additional","affiliation":[{"name":"Institute of Engineering Thermodynamics, University of Siegen, D-57076 Siegen, Germany"},{"name":"Center for Sensor Systems (ZESS), University of Siegen, D-57076 Siegen, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,11]]},"reference":[{"key":"ref_1","unstructured":"(2020, November 25). 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