11 November 2010 Optical design for near range lidar
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Abstract
Nowadays air-flow and certain gas measurements in near range are needed as a lidar application. Lidar optics, however, has blind area because it takes a certain distance to overlap the transmitting beam and the receiver's field of view. To detect the near range lidar echo with the narrow field of view, the optical design should be adequate. In this study, several cases of concrete lidar systems for near range measurement will be introduced. The near range compact Raman lidar applications, here the author mainly explain, are hydrogen leakage gas detection up to 50m ahead, monitoring exhaust fume at an intersection, air-flow measurement for a closed space such as a exhibition hall, and so on. The system should be compact as the near range lidar. The optical design should be simple to accomplish the near range measurement. The author has started the theoretical calculation of the lidar echo simulation with the various types of optical designs such as biaxial, coaxial and inline optics, which has common optics for the transmitting and receiving optics. The signal-to-noise ratio will be also estimated in the viewpoint of lowering transmitting beam power for eye-safe. The near range from zero to a few hundred meters is a target distance. The calculated results were compared and evaluated with the optical specification of the actual lidar. Now, the studies are extended, and the several types of near range lidars were developed mainly for the disaster prediction. They are certain gas detection, heavy rain prediction and lightning stroke detection. The "inline" optics adapt to the various kinds of lidar techniques, such as usual Mie lidar, Raman lidar, and polarization lidar. In this report, such a variety of the inline lidars are also introduced.
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Tatsuo Shiina, Tatsuo Shiina, } "Optical design for near range lidar", Proc. SPIE 7860, Lidar Remote Sensing for Environmental Monitoring XI, 78600B (11 November 2010); doi: 10.1117/12.869568; https://doi.org/10.1117/12.869568
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