title: Single-tube on-beam quartz-enhanced photoacoustic spectroscopy.
abstract: Quartz-enhanced photoacoustic spectroscopy (QEPAS) with a single-tube acoustic microresonator (AmR) inserted between the prongs of a custom quartz tuning fork (QTF) was developed, investigated, and optimized experimentally. Due to the high acoustic coupling efficiency between the AmR and the QTF, the single-tube on-beam QEPAS spectrophone configuration improves the detection sensitivity by 2 orders of magnitude compared to a bare QTF. This approach significantly reduces the spectrophone size with respect to the traditional on-beam spectrophone configuration, thereby facilitating the laser beam alignment. A 1σ normalized noise equivalent absorption coefficient of 1.21×10(-8) cm(-1)·W/√Hz was obtained for dry CO2 detection at normal atmospheric pressure.
authors.forename: Huadan
authors.initials: H
authors.lastname: Zheng
authors.forename: Lei
authors.initials: L
authors.lastname: Dong
authors.forename: Angelo
authors.initials: A
authors.lastname: Sampaolo
authors.forename: Hongpeng
authors.initials: H
authors.lastname: Wu
authors.forename: Pietro
authors.initials: P
authors.lastname: Patimisco
authors.forename: Xukun
authors.initials: X
authors.lastname: Yin
authors.forename: Weiguang
authors.initials: W
authors.lastname: Ma
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.forename: Wangbao
authors.initials: W
authors.lastname: Yin
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Spagnolo
authors.forename: Suotang
authors.initials: S
authors.lastname: Jia
authors.forename: Frank K
authors.initials: FK
authors.lastname: Tittel