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Pressure-Compensated Fiber-Optic Photoacoustic Sensors for Trace SO2Analysis in Gas Insulation Equipment
- Source :
- Analytical Chemistry; July 2024, Vol. 96 Issue: 27 p10995-11001, 7p
- Publication Year :
- 2024
-
Abstract
- A high-sensitivity fiber-optic photoacoustic sensor with pressure compensation is proposed to analyze the decomposition component SO2in high-pressure gas insulation equipment. The multiple influence mechanism of pressure on photoacoustic excitation and cantilever detection has been theoretically analyzed and verified. In the high-pressure environment, the excited photoacoustic signal is enhanced, which compensates for the loss of sensitivity of the cantilever. A fiber-optic F–P cantilever is utilized to simultaneously measure static pressure and dynamic photoacoustic wave, and a spectral demodulation method based on white light interference is applied to calculate the optical path difference of the F–P interferometer (FPI). The real-time pressure is judged through the linear relationship between the average optical path difference of FPI and the pressure, which gives the proposed fiber-optic photoacoustic sensor the inherent advantages of being uncharged and resistant to electromagnetic interference. The average optical path difference of FPI is positively related to pressure, with a responsivity of 0.6 μm/atm, which is based on changes in the refractive index of gas. In the range of 1–4 atm, the SO2sensor has a higher detection sensitivity at high-pressure, which benefits from the pressure compensation effect. With the pressure environment of gas insulation equipment at 4 atm as the application background, the SO2gas is tested. The detection limit is 20 ppb with an averaging time of 400 s.
Details
- Language :
- English
- ISSN :
- 00032700 and 15206882
- Volume :
- 96
- Issue :
- 27
- Database :
- Supplemental Index
- Journal :
- Analytical Chemistry
- Publication Type :
- Periodical
- Accession number :
- ejs66729938
- Full Text :
- https://doi.org/10.1021/acs.analchem.4c01480