Photoacoustic analyzer for the artifact-free parallel detection of soot and NO 2 in engine exhaust

Christoph Haisch, Reinhard Niessner

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Soot particles and NO 2 are among the most hazardous emissions from diesel combustion engines. Currently, no analytical system exists which allows for the simultaneous, time-resolved online analysis of these two components. Furthermore, state-of-the-art NO 2 analyzers for exhaust gas require particle filtration prior to the analysis, which may induce artifacts and measurement errors. We present a photoacoustic instrument which overcomes these drawbacks. The sensitivity of the instrument (LOD NO2 = 0.3 ppm, LOD soot = 0.54 μg m -3, limit of detection/quantification) as well as the temporal resolutions are dictated by the needs of typical automotive applications. Also required for this specific application, we developed PA cells which can be heated to 80 ° C, while the microphones maintain a temperature of 45 ° C. Setup and specific parameters of the instrument are discussed, and the results of typical engine tests are compared to reference analytical instrumentation.

Original languageEnglish
Pages (from-to)7292-7296
Number of pages5
JournalAnalytical Chemistry
Volume84
Issue number17
DOIs
StatePublished - 4 Sep 2012

Fingerprint

Dive into the research topics of 'Photoacoustic analyzer for the artifact-free parallel detection of soot and NO 2 in engine exhaust'. Together they form a unique fingerprint.

Cite this