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Development of continuous monitoring of ambient carbon dioxide using near-infrared quartz-enhanced photoacoustic spectroscopy
- Source :
- Japanese Journal of Applied Physics; January 2024, Vol. 63 Issue: 1 p017001-017001, 1p
- Publication Year :
- 2024
-
Abstract
- We demonstrate continuous measurement of carbon dioxide (CO2) in the atmosphere using quartz-enhanced photoacoustic spectroscopy (QEPAS) at 2.008 μm with a fiber-coupled distributed-feedback laser. The QEPAS sensor is composed of a quartz tuning fork with a resonance frequency f0of 12.4 kHz. The photoacoustic second-harmonic (2f) signal resulting from CO2absorption was detected using a digital lock-in amplifier. The photoacoustic signal is proportional to the laser power. The limit of detection at an absorption line of 4980.13161 cm−1with a line strength of 3.87 × 10−22cm2molecule−1cm−1was 12 parts per million with an integration time of 10 s. The results of the continuous monitoring of ambient CO2using the QEPAS sensor corresponded to those obtained using a nondispersive IR sensor. The QEPAS sensor exhibited a suitable performance for field measurements of the CO2mixing ratio.
Details
- Language :
- English
- ISSN :
- 00214922 and 13474065
- Volume :
- 63
- Issue :
- 1
- Database :
- Supplemental Index
- Journal :
- Japanese Journal of Applied Physics
- Publication Type :
- Periodical
- Accession number :
- ejs64962597
- Full Text :
- https://doi.org/10.35848/1347-4065/ad1011