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Sensors
Volume 22
Issue 7
10.3390/s22072626
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Article

Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS)

by
Ryan Thalman
1,*,
Nitish Bhardwaj
2,
Callum E. Flowerday
2 and
Jaron C. Hansen
2
1
Department of Chemistry, Snow College, Richfield, UT 84701, USA
2
Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA
*
Author to whom correspondence should be addressed.
Sensors 2022, 22(7), 2626; https://doi.org/10.3390/s22072626
Submission received: 23 February 2022 / Revised: 27 March 2022 / Accepted: 27 March 2022 / Published: 29 March 2022
(This article belongs to the Special Issue Advances in Optical and Laser Sensing Technologies for Environmental Applications)
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Abstract

Sulfur dioxide (SO2) 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 SO2 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 SO2 concentrations and were compared to fluorescence standard measurements for SO2. The comparison was well correlated, R2 = 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.
Keywords: optical cavity; SO2 interference; trace gas detection; air quality monitoring; air pollution optical cavity; SO2 interference; trace gas detection; air quality monitoring; air pollution
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MDPI and ACS Style

Thalman, R.; Bhardwaj, N.; Flowerday, C.E.; Hansen, J.C. Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS). Sensors 2022, 22, 2626. https://doi.org/10.3390/s22072626

AMA Style

Thalman R, Bhardwaj N, Flowerday CE, Hansen JC. Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS). Sensors. 2022; 22(7):2626. https://doi.org/10.3390/s22072626

Chicago/Turabian Style

Thalman, Ryan, Nitish Bhardwaj, Callum E. Flowerday, and Jaron C. Hansen. 2022. "Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS)" Sensors 22, no. 7: 2626. https://doi.org/10.3390/s22072626

APA Style

Thalman, R., Bhardwaj, N., Flowerday, C. E., & Hansen, J. C. (2022). Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS). Sensors, 22(7), 2626. https://doi.org/10.3390/s22072626

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