Enhancement of photoacoustic spectroscopy with sorption enrichment for ppt-level benzene detection

Autor:	Juho Karhu, Tuomas Hieta
Přispěvatelé:	Department of Chemistry
Jazyk:	angličtina
Rok vydání:	2022
Předmět:	Physics - Instrumentation and Detectors Lasers Spectrum Analysis 116 Chemical sciences FOS: Physical sciences Benzene Humidity Instrumentation and Detectors (physics.ins-det) EXPOSURE Electrical and Electronic Engineering TOLUENE Engineering (miscellaneous) Atomic and Molecular Physics and Optics
Popis:	A real time trace gas detector for benzene is demonstrated. The measurement system takes an advantage of modest enrichment through short adsorption periods to reach a ppt-level detection limit with a sampling cycle of 90 s, which includes sample adsorption, desorption and a spectroscopic measurement. Benzene is collected on Tenax TA sorbent for 30 s and then detected from the enriched samples with photoacoustic spectroscopy. A high sensitivity is achieved using cantilever-enhanced photoacoustic spectroscopy and a continuous-wave quantum cascade laser emitting at the wavelength 14.8 $\mu$m, which corresponds to the absorption wavelength of the strongest benzene infrared band. We reach a detection limit of 150 ppt of benzene, over one sampling cycle. Interference from humidity and other common petrochemicals is evaluated. Comment: 8 pages, 7 figures
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dc48cf930255e9b6ad27a83bd7500cd9 http://hdl.handle.net/10138/355356 Zobrazit plný text záznamu