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Study of the Laser Auto Focus Control System of Laser Radar

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Tutor: AnZhiYong
School: Changchun University of Science and Technology
Course: Optical Engineering
Keywords: Beam focus,DSP,Closed-loop control,light intensity signal,Motorcontrol
CLC: TN958.98
Type: Master's thesis
Year:  2013
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Abstract:
With the rapid development of laser technology, laser radar combined with the radar technology came into being. Because of the strong anti-interference ability and high resolution, laser radar has been applied to many fields. Laser beam of the transmitting and receiving system is an important information carrier of the laser radar and the measurement basis, so the modulation of the laser beam emitted by the laser radar is important. For the measured distance changed at any time, to ensure the measurement accuracy of the laser radar. It is hoped that the reflected laser beam has a strong echo energy. To avoid a laser spot is too large at the target point, real-time adjustment of the focusing distance of the laser beam is required; therefore it is necessary in real time focusing control of the laser beam.This paper used the motor driven linkage structure to change the focal length of the optical system. At the same time, in order to design the optimization of the system better, this paper introduced a closed-loop control method. This method used a light intensity signal as a closed loop control signal, and then thought of it as the rotation of the stepper motor control reference. So we can achieve the purpose that real-time detection about back waves and beam focusing quickly at target point in any measurement. This approach makes the beams are most convergence state in any measurement position.
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