Spatially engineered optical–acoustic matching in quartz-enhanced photoacoustic spectroscopy
Shanxi University · Polytechnic University of Bari · +1 more institution
Abstract
Quartz-enhanced photoacoustic spectroscopy (QEPAS) offers high sensitivity for trace-gas detection, but its performance is often limited by a spatial mismatch between distributed photoacoustic excitation and the intrinsic sensitivity region of the quartz tuning fork (QTF). In many multi-pass QEPAS configurations, extending the optical path length alone does not ensure efficient signal enhancement. Here, we present a spatially engineered optical-acoustic matching strategy for QEPAS. A confocal-like multi-pass cell folds the excitation beam multiple times while spatially confining optical absorption within the intrinsic high-sensitivity region of the QTF. In parallel, non-resonant conical acoustic collectors…
Citation impact
- FWCI
- 37.44
- Percentile
- 100%
- References
- 39
Authors
11Topics & keywords
- Photoacoustic spectroscopy
- Photoacoustic effect
- Sensitivity (control systems)
- SIGNAL (programming language)
- Narrowband
- Photoacoustic imaging in biomedicine
- Optical path length
- Absorption (acoustics)
- Clean water and sanitation