Small mobile lidar intended to control leakage of methane and methane-bearing gas mixtures
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 KT...
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Zusammenfassung: | 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 /spl mu/m) or Nd:YA (1.079 /spl mu/m) lasers. They overlap the 1.52 to 1.58 and 3.2 to 3.5 /spl mu/m ranges and allow work on both the most intense and weak CH/sub 4/ absorption bands with the center at /spl lambda/=1.57 /spl mu/m 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 /spl mu/m bands. |
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DOI: | 10.1109/KORUS.1999.876256 |