Title :
Small mobile lidar intended to control leakage of methane and methane-bearing gas mixtures
Author :
Andreev, Yu.M. ; Alampiev, M.V. ; Geiko, P.P. ; Gusamov, A.I. ; Petrov, B.M. ; Kataev, M.Yu. ; Shvom, E.M.
Author_Institution :
Inst. for Opt. Monitoring, Acad. of Sci., Tomsk, Russia
Abstract :
In this paper we present results obtained at the first stage of development of Small Mobile DAS Lidar to control leakage of methane and methane-bearing gas mixtures. We developed two models of the emission sources for the Lidar. Both of them are small Optical Parametric Oscillators (OPO) based on KTP crystals pumped with Nd:YAG (1.064 μm) or Nd:YA (1.079 μm) lasers. They overlap the 1.52 to 1.58 and 3.2 to 3.5 μm ranges and allow work on both the most intense and weak CH4 absorption bands with the center at λ=1.57 μm having the emission line width of 1 and 2.5 nm, respectively. The energies of single 5-ns emission pulses are equal to 4-5 and 8-10 mJ, respectively. It is enough for sensing up to 1 to 3-km distances with sensitivity of 50 ppb/km. Second Harmonic Generation (SHG) of OPO emission allows one to make measurements on 1.66 and 0.77 μm bands
Keywords :
gas sensors; optical harmonic generation; optical parametric oscillators; optical radar; optical sensors; remote sensing by laser beam; 0.77 micrometre; 1 to 3 km; 1.52 to 1.58 micrometre; 1.66 micrometre; 3.2 to 3.5 micrometre; 4 to 5 mJ; 5 ns; 8 to 10 mJ; KTP; KTiOPO4; Small Mobile DAS Lidar; emission line width; emission sources; methane leakage; methane-bearing gas mixtures; optical parametric oscillators; second harmonic generation; Crystals; Gas lasers; Laser excitation; Laser radar; Nonlinear optics; Optical harmonic generation; Optical pumping; Optical sensors; Oscillators; Stimulated emission;
Conference_Titel :
Science and Technology, 1999. KORUS '99. Proceedings. The Third Russian-Korean International Symposium on
Conference_Location :
Novosibirsk
Print_ISBN :
0-7803-5729-9
DOI :
10.1109/KORUS.1999.876256
