Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS)
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| Format: | Preprint |
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2024
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| _version_ | 1866909402945028096 |
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| author | Thalman, Ryan Bhardwaj, Nitish Flowerday, Callum E. Hansen, Jaron C. |
| author_facet | Thalman, Ryan Bhardwaj, Nitish Flowerday, Callum E. Hansen, Jaron C. |
| contents | Sulfur dioxide ($\mathrm{SO}_2$) is an important precursor for the formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of $\mathrm{SO}_2$ with a minimum limit of detection of 0.75 ppbv (3-$σ$) using the spectral range 305.5--312 nm and an averaging time of 5 min. The instrument consists of high-reflectivity mirrors (0.9985 at 310 nm) and a deep UV light source (Light Emitting Diode). The effective absorption path length of the instrument is 610 m with a 0.966 m base length. Published reference absorption cross sections were used to fit and retrieve the $\mathrm{SO}_2$ concentrations and were compared to fluorescence standard measurements for $\mathrm{SO}_2$. The comparison was well correlated ($R^2 = 0.9998$) with a correlation slope of 1.04. Interferences for fluorescence measurements were tested, and the BBCEAS showed no interference, while ambient measurements responded similarly to standard measurement techniques. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_15601 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) Thalman, Ryan Bhardwaj, Nitish Flowerday, Callum E. Hansen, Jaron C. Instrumentation and Detectors Atmospheric and Oceanic Physics Sulfur dioxide ($\mathrm{SO}_2$) is an important precursor for the formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of $\mathrm{SO}_2$ with a minimum limit of detection of 0.75 ppbv (3-$σ$) using the spectral range 305.5--312 nm and an averaging time of 5 min. The instrument consists of high-reflectivity mirrors (0.9985 at 310 nm) and a deep UV light source (Light Emitting Diode). The effective absorption path length of the instrument is 610 m with a 0.966 m base length. Published reference absorption cross sections were used to fit and retrieve the $\mathrm{SO}_2$ concentrations and were compared to fluorescence standard measurements for $\mathrm{SO}_2$. The comparison was well correlated ($R^2 = 0.9998$) with a correlation slope of 1.04. Interferences for fluorescence measurements were tested, and the BBCEAS showed no interference, while ambient measurements responded similarly to standard measurement techniques. |
| title | Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) |
| topic | Instrumentation and Detectors Atmospheric and Oceanic Physics |
| url | https://arxiv.org/abs/2411.15601 |