As a Principal Investigator (PI):
Adaptive Optical Systems
Development of Fixed-Order H_infinity sub-Optimal Controller for Adaptive Optical Systems:
Adaptive optics are used to enhance the capability of optical systems by actively compensating for aberrations. These aberrations, such as atmospheric turbulence, optical fabrication errors, thermally induced distortions, or laser device aberrations, reduce the peak intensity and smear an image or a laser beam propagating to a target. The twinkling of stars or distorted images across a paved road on a hot summer day is caused by turbulence in the atmosphere. Distortions like these were corrected by adaptive optics for a long time. The principal uses for adaptive optics are improving image quality in optical and infrared astronomical telescopes, imaging and tracking rapidly moving space objects, and compensating for laser beam distortion through the atmosphere. Adaptive optics system consists of a wave front sensor, deformable mirror, and a control unit. The basic operating principle of adaptive optics system is detection, calculation and activation. First the distortion in the wavefront is determined by the sensors. Then, the control unit derive DM up to takes the shape in the reverse form of distorted wavefront and the wave reflected front face of the mirror would be corrected.
Many problems particularly (long distance secure wireless communication, laser weapons, imaging systems etc.) needed for adaptive optics systems in the defense industry, already cannot be produced in our country at the moment. The main reason is that the system can not be easily controlled with conventional methods or the inability to reach the desired success rate with these methods. For example, because of absence the adaptive optic system in laser damage or blinding system, manufacturers are forced to enhance their laser power. Sufficient energy density to destroy the target cannot be formed without eliminated atmospheric distortions. In order to obtain an applicable control system, the problem needs to solve as an optimization problem with a proper definition of the performance index.
Reducing the Conservatism on the Design of Fixed Order H_infinity Controller:
As a Researcher:
Dwell Time Optimisation
Determination of Stability and Stability Conditions for Linear and Nonlinear Discrete-Time Bi-Model Systems, Controller Design and Implementation:
Active Suspension System
As a Technical Consultant: