Remote Sensing        INOE

The principle of an Ozone Differential Absorption Lidar is based on differential absorption of optical radiation from atmospheric molecules. This technique is used to measure atmospheric gas concentration.

The laser emission / detection wavelengths are 266, 289, 299, 316 nm (having a total of 120mJ). The laser pulse duration is ~ 8 ns (at 266 nm), repetition rate 10 Hz, and the beam diameter between 5-7 mm at fwhm. The dynamic range covers 0.4-12 km depending on atmosphere transmission, with a 7.5 m spatial resolution. The reception has a 400 mm quasi-Cassegrain telescope with 2.5 mrad field of view, and the system acquisition is both analog and photon counting, with a 20 MS/s on 12 bits analog sampling rate and 250 Mhz photon counting count rate.

The final output of this system is vertical profile of ozone concentration up to 12 km with a resolution of few hundred meters.