A Portable ppb-Level Formaldehyde Sensor for Real-Time Air Quality Monitoring

verfasst von
Kun Duan, Junjun Wu, Tobias Grabe, Roland Lachmayer, Wei Ren
Abstract

— We report the development of a battery-driven, portable, and ultrasensitive optical gas sensor for parts per billion (ppb)-level formaldehyde (H2CO) diagnostics. The sensor consists of an interband cascade laser exploiting the intense H2CO absorption line at 3.6 µm, an open-path multipass gas cell with 26.4-m pathlength, and homemade electronics for signal processing, data acquisition, and results display. Besides the advantage of being interference-free from other atmospheric constituents, the Allan deviation analysis reveals a minimum detection limit (MDL) of 1.42 ppb at a time resolution of 0.2 s. This limit can be enhanced to 43 parts per trillion (ppt) with an average time of 230 s. Ultimately, we successfully showcased the practical use of the portable sensor for detecting indoor H2CO.

Organisationseinheit(en)
Institut für Produktentwicklung und Gerätebau
Externe Organisation(en)
The Chinese University of Hong Kong
Chongqing University
Typ
Artikel
Journal
IEEE Transactions on Instrumentation and Measurement
Band
73
Seiten
1-7
Anzahl der Seiten
7
ISSN
0018-9456
Publikationsdatum
01.2024
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Instrumentierung, Elektrotechnik und Elektronik
Elektronische Version(en)
https://doi.org/10.1109/TIM.2023.3338688 (Zugang: Geschlossen)