Liquid crystal based non-mechanical beam tracking technology

2017 
Abstract The simulation and experimental testing of a non-mechanical beam tracking technology was investigated, in which a liquid crystal spatial light modulator (LCSLM) was used as a beam steering control device. The LCSLM was capable of steering the beam from −2.8947 to 2.8947° with a resolution of approximately 0.0226°. The LCSLM-based tracking system was simulated by MATLAB, and the Bode diagram indicated that the tracking performance was better than −17 dB when the disturbance frequency was 1 Hz. The tracking experiment was also executed to test the actual performance. The experimental data revealed that the tracking error (1 σ ) ranged from 0.024 θ max to 0.225 θ max when the disturbance frequency ranged from 0.2 to 2.0 Hz with an amplitude of θ max =2.4873°. Simulation and experimental testing demonstrated the feasibility of the non-mechanical beam tracking technology that employs liquid crystals.
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