13 February 2001 Incoherent Doppler lidar using 355-nm wavelength for wind measurement
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Abstract
This paper studies the wind measurement accuracy of two kinds of incoherent UV Doppler lidars, which use two transmission slopes of one etalon filter and those of one atomic vapor filter. The third harmonic wavelength of the injection seeded Nd:YAG laser is made to change alternately to near the midpoint of one slope and near the midpoint of the another slope using the AO wavelength shifters. The signals that pass through the two edges are synchronously received and the Doppler shift component is derived from the ratio of these signals. It is desirable to use the eye safe wavelengths for the high power lidar or the space borne lidar, and this technique is available to apply to the eye safe wavelength. In this paper, simulation results of the wind measurement accuracy of the space borne Doppler lidar using an etalon filter and a silver atomic vapor filter are shown. They show accuracy of ~5m/s below 35km altitude and ~10m/s below 48km altitude using the etalon filter and accuracy of ~1m/s below 22km altitude and ~10m/s below 54km altitude using the silver vapor filter with 500m range resolution, respectively. The measurement accuracy of the etalon filter method is not so good as the silver filter method, because the thermal stability of the etalon filter is worse than that of the silver filter.
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Yasukuni Shibata, Chikao Nagasawa, "Incoherent Doppler lidar using 355-nm wavelength for wind measurement", Proc. SPIE 4153, Lidar Remote Sensing for Industry and Environment Monitoring, (13 February 2001); doi: 10.1117/12.417101; https://doi.org/10.1117/12.417101
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