Open AccessAll optical quartz-enhanced photoacoustic spectroscopy
Author(s) -
Yanyan Liu,
Lei Dong,
Hongpeng Wu,
Hongfei Zheng,
Weiguang Ma,
Lei Zhang,
Wen Yin,
Suotang Jia
Publication year - 2013
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.62.220701
Subject(s) - photoacoustic spectroscopy , materials science , optics , trace gas , spectroscopy , absorption (acoustics) , sensitivity (control systems) , quartz , photoacoustic effect , interference (communication) , absorption spectroscopy , optoelectronics , photoacoustic imaging in biomedicine , physics , computer science , electronic engineering , channel (broadcasting) , quantum mechanics , composite material , engineering , computer network , meteorology
A trace gas sensor based on all optical quartz-enhanced photoacoustic spectroscopy (QEPAS) is designed and demonstrated. An extra detection light beam is added to the traditional QEPAS setup to convert the amplitude of vibration of the quartz tuning fork, which is proportional to the concentration of the target gas, into the variation of the detection light intensity. As a result, there are not any electrical components near the measurement position. Such a design makes it immune to electromagnetic interference and provides a compact sensor head, which can be used in a tiny space or an adverse environment. Using the new setup to measure the water concentration in air, the obtained noise equivalent absorption coefficient is 1.13×10-6 cm-1W/√Hz. The approaches to further optimizing the system and improving the sensitivity are also discussed in detail.