title: Detection of gaseous elemental mercury using a frequency-doubled green diode laser.
abstract: We demonstrate a second-harmonic-generation (SHG) based method for the detection of gaseous elemental mercury by using a newly available green diode laser. Multimode ultraviolet radiation at 253.7 nm is generated through a process of SHG. Correlation spectroscopy is introduced into the scheme to guarantee the measurement accuracy. The limit of detection achieved is 0.6 μg/m3(0.07 ppb) for 1-m pathlength and 10-s integration time. The measurement accuracy is estimated to be 1.2%. The linear response range is estimated to be 0~60 μg/m2(6.7 ppb·m), within which the linearity error is less than 1%. Real-time monitoring of mercury volatilization is demonstrated with a time resolution of 1 s. The results of performance characterization show that the proposed method has great potentials for mercury sensing in environmental and industrial fields.
authors.forename: Xiutao
authors.initials: X
authors.lastname: Lou
authors.forename: Tie
authors.initials: T
authors.lastname: Zhang
authors.forename: Hongze
authors.initials: H
authors.lastname: Lin
authors.forename: Shiyi
authors.initials: S
authors.lastname: Gao
authors.forename: Lianjie
authors.initials: L
authors.lastname: Xu
authors.forename: Junnan
authors.initials: J
authors.lastname: Wang
authors.forename: Li
authors.initials: L
authors.lastname: Wan
authors.forename: Sailing
authors.initials: S
authors.lastname: He