doi: 10.17586/2226-1494-2016-16-6-1004-1009


V. V. Elizarov, A. S. Grishkanich, P. A. Zhevlakov, S. V. Kascheev, A. A. Rybikov, I. S. Sidorov

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For citation: Elizarov V.V., Grishkanich A.S., Kascheev S.V., Zhevlakov A.P., Rybikov A.A., Sidorov I.S.. Lidar combined scanning unit. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2016, vol. 16, no. 6, pp. 1004–1009. doi: 10.17586/2226-1494-2016-16-6-1004-1009


Subject of Research. The results of lidar combined scanning unit development for locating leaks of hydrocarbons are presented The unit enables to perform high-speed scanning of the investigated space in wide and narrow angle fields. Method. Scanning in a wide angular field is produced by one-line scanning path by means of the movable aluminum mirror with a frequency of 20Hz and amplitude of 20 degrees of swing. Narrowband scanning is performed along a spiral path by the deflector. The deflection of the beam is done by rotation of the optical wedges forming part of the deflector at an angle of ±50. The control function of the scanning node is performed by a specialized software product written in C# programming language. Main Results. This scanning unit allows scanning the investigated area at a distance of 50-100 m with spatial resolution at the level of 3 cm. The positioning accuracy of the laser beam in space is 15'. The developed scanning unit gives the possibility to browse the entire investigated area for the time not more than 1 ms at a rotation frequency of each wedge from 50 to 200 Hz. The problem of unambiguous definition of the beam geographical coordinates in space is solved at the software level according to the rotation angles of the mirrors and optical wedges. Lidar system coordinates are determined by means of GPS. Practical Relevance. Development results open the possibility for increasing the spatial resolution of scanning systems of a wide range of lidars and can provide high positioning accuracy of the laser beam in space.

Keywords: remote sensing, lidar, scanning system, spiral scanning, spatial resolution


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