The Sulfur Dioxide Analyzer measures sulfur dioxide based on absorbance of UV light at one wavelength by SO2 molecules which then decay to a lower energy state by emitting UV light at a longer wavelength.
so2: Sulfur Dioxide Monitor
Springston SR. 2017. Sulfur Dioxide (SO2) Analyzer Instrument Handbook. Ed. by Robert Stafford, ARM Research Facility. DOE/SC-ARM-TR-180.
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