5 October 2017 New microwave modulation LIDAR scheme for naval mine detection
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Abstract
In this paper, a new modulator design suited for hybrid Lidar-radar applications is proposed and implemented. This modulator delivers a stable and tunable modulated optical pulse. Modulation frequency is in the GHz range, and associated with a bandpass filtering at the detection allow detecting a target echo embedded in the backscattering noise. This principle is known as hybrid Lidar-radar. We expose in this article theoretical principle of this new modulator and its experimental implementation. As polarization filtering can be coupled with the hybrid Lidar-radar technique to further improve target return, polarimetric sensitivity of this modulator was investigated. Since, theoretical results mismatched the experimental ones, thus, further investigations were taken. Mechanical constraint induced by mirror mount caused birefringent behavior to the mirror substrate. As this effect was not homogeneously distributed in the material, we were not being able to compensate it by modelling. However, we propose an experimental approach to solve this problem.
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Nour Alem, Fabrice Pellen, Bernard Le Jeune, "New microwave modulation LIDAR scheme for naval mine detection", Proc. SPIE 10434, Electro-Optical Remote Sensing XI, 1043403 (5 October 2017); doi: 10.1117/12.2279148; https://doi.org/10.1117/12.2279148
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