LiSA system is a backscattering Lidar. It can work separately or simultaneous on two wavelengths. The operating principle consists in emitting of a short pulse of light in the atmosphere, followed by the registration of backscattered radiation as function of distance.
The system is useful to study the lower troposphere, including the planetary boundary layer.

The main component of the emission block is a pulsed, Q-switched YAG:Nd laser, which produces short pulses (6 ns length) in a beam with 0.5 mrad divergence. A part of emitted laser pulse is utilized as marker of ‘zero’ time (the reference signal to normalize the return signal, when the reproducibility of laser emission is not proper). The backscattered field collected by the receiver optics is passed through a spectrum analyzer, which selects only the specific wavelength interval of interest for the application, in order to minimize the background radiation contribution.  The electric signal generated by photodetectors is electronically synchronized, amplified and converted in digital signal, which is finally delivered to a PC for processing. 

Technical Data