{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,25]],"date-time":"2026-07-25T03:17:16Z","timestamp":1784949436605,"version":"3.55.0"},"reference-count":54,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2022,3,29]],"date-time":"2022-03-29T00:00:00Z","timestamp":1648512000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["AGS-2114655"],"award-info":[{"award-number":["AGS-2114655"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Utah NASA Space Grant Consortium Faculty Seed Grant","award":["Faculty Seed Grant"],"award-info":[{"award-number":["Faculty Seed Grant"]}]},{"name":"Brigham Young University Department of Chemistry and Biochemistry","award":["Undergraduate Research Award"],"award-info":[{"award-number":["Undergraduate Research Award"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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-\u03c3) using the spectral range 305.5\u2013312 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.<\/jats:p>","DOI":"10.3390\/s22072626","type":"journal-article","created":{"date-parts":[[2022,3,29]],"date-time":"2022-03-29T21:45:51Z","timestamp":1648590351000},"page":"2626","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS)"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1893-7315","authenticated-orcid":false,"given":"Ryan","family":"Thalman","sequence":"first","affiliation":[{"name":"Department of Chemistry, Snow College, Richfield, UT 84701, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nitish","family":"Bhardwaj","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4172-3910","authenticated-orcid":false,"given":"Callum E.","family":"Flowerday","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jaron C.","family":"Hansen","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2022,3,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1111\/j.1749-6632.1987.tb37648.x","article-title":"Both Sides Now","volume":"502","author":"Schwartz","year":"1987","journal-title":"Ann. 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