ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 1, pp. 71-74

Elimination of backscattering noise of laser radiation in quasi-continuous lidars

V.I. Grigorievsky 1 , Y.A. Tezadov 2 , A.V. Elbakidze 1 
1 V. A. Kotelnikov Institute of Radioengineering and Electronics RAS, Moscow region, Fryazino, Russia
2 IPG – Photonics Group, Moscow region, Fryazino, Russia
Accepted: 29.11.2017
DOI: 10.21046/2070-7401-2018-15-1-71-74
The paper presents the results of a theoretical and experimental investigation of the backscattering of light in lidars operating in a continuous or quasi-continuous regime when it is impossible to perform gating and eliminate the effect of backscattering of light in the atmosphere on the received signal. Theoretical calculations give backscattering at a level of ~4•10–12 W at a wavelength of 1600 nm with a transmitter power of 2 W and a separation of the receiver and transmitter from each other by a distance of 5 cm. The experiment confirmed the correctness of the theoretical backscatter estimation. A slight discrepancy between the theoretical and experimental data is due to cloudy weather and the presence of moisture in the atmosphere. Separation of the receiver and the transmitter by 25 cm from each other allowed reducing the backscatter to the value of the noise of the photodetector.
Keywords: lidar, backscattering, atmosphere, indicatrix, remote sensing, optical transmitter, receiver
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