title: Mobile spectroscopic system for trace gas detection using a tunable mid-IR laser.
abstract: We describe a mobile spectroscopic system for trace gas analysis based on the open path differential absorption spectrometer and the photoacoustic spectrometer. The first method allows long distance measurements (up to a few kilometers) while the second one provides local in situ detection of pollutants. The open path system is based on the nanosecond (f = 10 Hz, tau = 5 ns) lamp pumped Nd:YAG laser and a tunable two cascade optical parametric generator operating in the 5-12 microm spectral region. This source was mounted into the lidar setup based on the coaxial transmitter/receiver. The photoacoustic system was constructed using the same laser as well as a nonresonant photoacoustic cell.
authors.affiliation: Institute of Physics, Savanoriu 231, LT-02300 Vilnius, Lithuania.
authors.forename: V
authors.initials: V
authors.lastname: Vaicikauskas
authors.forename: M
authors.initials: M
authors.lastname: Kaucikas
authors.forename: V
authors.initials: V
authors.lastname: Svedas
authors.forename: Z
authors.initials: Z
authors.lastname: Kuprionis