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A segmented long period fiber grating (LPFG)-based torsion sensor with both high sensitivity and ability to discriminate torsion direction is proposed and experimentally investigated. The sensor is made up of three spatial orthogonal short LPFGs by using a CO2 laser notched method. Experimental results show that the torsion sensitivities can reach −0.54 and 0.33 dB/(rad/m) in dip depth and 0.30 and...
We experimentally generate a stochastic electromagnetic beam with controllable coherence, employing two crossed zero-twisted nematic liquid crystal spatial light modulators. The coherence of the stochastic electromagnetic beam can be controlled by the variation magnitude of phase modulation of the spatial light modulators. We measure the coherence properties of the beam using Young's interference...
This manuscript describes a UAV implemented with vision and laser based localization algorithm to track and land on a moving platform. Specifically, a pre-designed marker is installed on the moving platform and a downward facing monocular camera is mounted on the UAV for pose estimation. For a robust and precise UAV height estimation, a LiDAR scanning range finder is utilized to determine accurate...
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