Upgraded raman lidar with ultraspectral resolution

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 CH
4
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.