title: Detection of elemental mercury by multimode diode laser correlation spectroscopy.
abstract: We demonstrate a method for elemental mercury detection based on correlation spectroscopy employing UV laser radiation generated by sum-frequency mixing of two visible multimode diode lasers. Resonance matching of the multimode UV laser is achieved in a wide wavelength range and with good tolerance for various operating conditions. Large mode-hops provide an off-resonance baseline, eliminating interferences from other gas species with broadband absorption. A sensitivity of 1 μg/m3 is obtained for a 1-m path length and 30-s integration time. The performance of the system shows promise for mercury monitoring in industrial applications.
authors.affiliation: Department of Physics, Harbin Institute of Technology, Harbin 150001, China.
authors.forename: Xiutao
authors.initials: X
authors.lastname: Lou
authors.forename: Gabriel
authors.initials: G
authors.lastname: Somesfalean
authors.forename: Sune
authors.initials: S
authors.lastname: Svanberg
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Zhang
authors.forename: Shaohua
authors.initials: S
authors.lastname: Wu
mesh_terms: D004784:Environmental Monitoring / Q000295:instrumentation*; D004785:Environmental Pollutants / Q000032:analysis*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D054023:Lasers, Semiconductor; D008628:Mercury / Q000032:analysis*; D013057:Spectrum Analysis / Q000295:instrumentation*
chemical_list: D004785:Environmental Pollutants; D008628:Mercury