Title :
Upgraded raman lidar with ultraspectral resolution
Author :
Kascheev, S.V. ; Elizarov, V.V. ; Grishkanich, A.S. ; Kosachev, D.V. ; Petrov, S.B. ; Zhevlakov, A.P.
Author_Institution :
Nat. Res. Univ. of Informational Technol. Mech. & Opt., St. Petersburg, Russia
fDate :
June 30 2014-July 4 2014
Abstract :
Upgraded Raman Lidar with spectral resolution of dλ / λ<;10-3 have been design and elaborated for the aerosearch of leaks on the main gas pipelines. The sensing is carried out by 7ns - pulses of DPSS laser with energy of 10 mJ at 300Hz frequency and wavelength of 261,7 nm. Polycromator have been implemented on base of the concave grating (N=1200 mm) and operates in 4th diffraction order. Lidar measures the leaks of CH4 with concentration of 2 ppm and above. Scanning in angles of ±30° and at frequency of 20 Hz allows to carry out measurements on inclined courses.
Keywords :
Raman lasers; diffraction gratings; measurement by laser beam; optical design techniques; optical pumping; optical radar; organic compounds; pipelines; solid lasers; 4th diffraction order; DPSS laser; aerosearch; concave grating; energy 10 mJ; frequency 20 Hz; frequency 300 Hz; inclined courses; main gas pipelines; methane leaks; polycromator; time 7 ns; ultraspectral resolution; upgraded Raman lidar design; wavelength 2617 nm; Diffraction gratings; Frequency measurement; Geology; Instruments; Measurement by laser beam;
Conference_Titel :
Laser Optics, 2014 International Conference
Conference_Location :
Saint Petersburg
Print_ISBN :
978-1-4799-3884-1
DOI :
10.1109/LO.2014.6886397
