Asian dust appears in the atmosphere in spring, spreads over long distances, and affects significantly on the environment. Scattering and absorption of Asian dust can be observed in the atmosphere at different angles on the basis of diurnal movement of the Sun. For this purpose, we used a solar tracker, which provides the Sun pointing and tracking. We present an optimal optical model of the solar tracker for atmospheric spectroscopy. A solution of the problem of loss stability of еру tracker pointing at the Sun near the zenith is shown. Test results demonstrate the efficiency of the proposed optimization methods.
In this paper, we propose a new type of Doppler discrimination system using an unseeded pulsed Q-switched laser and
solid etalon. To substantiate our system, we calculate the transmitting spectral power distribution and discriminator
characteristics. In our calculation, we use a 25 mm thick solid etalon with a finesse of 30, as well as a normal pulsed
laser with a bandwidth of 1 cm-1. The results reveal that the change in the receiving scattered signal through the
discriminator with a given LOS(Line of Sight) wind velocity is more sensitive than a normal iodine metal vapor-based
Doppler lidar receiving system. We experimentally verify our suggestion using our Doppler discriminator and
transmitter, and confirm that this combination is more sensitive than a metal vapor filter. Moreover, we suggest a more
efficient transmitter and a more sensitive double-edge receiving system based on our calculations and experimental
results.
We have designed and manufactured an optical system with dual field of view (FOV) for an uncooled IR camera. Fnumber
of the optical system with five elements is given by F/1.04. FOVs are given by 8°x6° for narrow FOV and 24° x
18° for wide FOV. One of the five lenses is linearly moved along the optical axis not only to change FOV but also to
athermalize for the optical system. The movement of the lens is fulfilled with a stepping motor within a few
micrometers' accuracy. The athermalization is compensated for 100 K of the temperature difference. The optical system
is integrated into an uncooled IR detector engine to verify the optical performance of the dual FOV IR system. The
uncooled IR detector consists of 320x240 pixels with 25μm pitch. Minimum resolvable temperature difference (MRTD)
as measured values at each FOV will be presented in this paper.
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