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)