Chun-yang WANG, Lan-ting LI, Hong-wei SHI, et al. Beam deflection control method based on liquid crystal phased array[J]. Chinese journal of liquid crystals and displays, 2018, 33(10): 857-863.
DOI:
Chun-yang WANG, Lan-ting LI, Hong-wei SHI, et al. Beam deflection control method based on liquid crystal phased array[J]. Chinese journal of liquid crystals and displays, 2018, 33(10): 857-863. DOI: 10.3788/YJYXS20183310.0857.
Beam deflection control method based on liquid crystal phased array
the liquid crystal phased array can realize beam deflection in a small angle range. However
due to the influence of manufacturing process
temperature and atmospheric disturbances
there is a certain error between the actual and the expected deflection angle of the beam deflection system. In order to make beam deflection more accurate
this paper proposes a closed-loop control loop for beam deflection based on fractional-order-controller. As the detection element
CCD receives the light diffusely reflected from measured object
adopting oblique triangulation to calculate the deflection error between the expected and the actual deflection angle. Then the error signal is transmitted to controller
the generated control signal will be sent to the controlled object-liquid crystal phased array
to achieve accurate beam deflection. Through simulation experiments and performance analysis
the system step response test reach a steady output state after two iterations. The closed-loop bandwidth is 7.67 rad/s
the suppression ratio of the sinusoidal disturbance signal system with amplitude 1 and frequency 1 is -18.06 dB. It is verified that the fractional-order-control algorithm can quickly suppress the disturbance and noise
furtherly
the disturbance suppression effect is good and the stability is high.
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references
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