Light beam jitter suppression method based on LQG + PI hybrid control strategy
A beam dithering and hybrid control technology, applied in adaptive control, general control system, control/regulation system, etc., to achieve the effect of increasing the control bandwidth of the system and reducing the wavefront residual error
Active Publication Date: 2021-04-20
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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[0003] The technical problem solved by the present invention is: Aiming at the low-frequency broadband beam jitter caused by atmospheric turbulence and the high-frequency narrow-band beam jitter caused by mechanical vibration in the adaptive optics system, a beam jitter suppression method based on the LQG+PI hybrid control strategy is proposed
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[0060] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific implementation examples and with reference to the accompanying drawings.
[0061] figure 1 It is a schematic diagram of the closed-loop control structure of the adaptive optical system, which consists of WFS (Wavefront Sensor, wavefront detector), CC (Control Cell, control unit), D / A converter (Digital / Analog) and TTM (Tip-tilt Mirror, tilt mirror) composition. The beam jitter control system is actually a closed-loop control realized by WFS and TTM. beam jitter signal After TTM compensation correction get residual signal After the residual signal is detected by the wavefront detector, it is sent to the control unit, and the control voltage u is obtained and then applied to the TTM to produce a change in surface shape, thereby obtaining phase correction Then, the closed-loop control...
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The invention discloses a light beam jitter suppression method based on an LQG + PI hybrid control strategy. The method comprises the following steps: firstly, building a jitter model for a light beam jitter signal, analyzing a PSD curve corresponding to the jitter model, carrying out the least square fitting of actual measurement data and calculation data, extracting a frequency component, and obtaining the accurate description of the light beam jitter signal; secondly, constructing a state vector space based on the light beam jitter signal, establishing Kalman filter-based LQG control, accurately predicting the jitter signal, and calculating to obtain a corresponding control voltage by using the predicted jitter signal; and then, superposing the voltage with a control voltage calculated by PI controllers connected in parallel to obtain a final control voltage to complete real-time correction of wavefront distortion. The method has the most remarkable advantages that the LQG control can well inhibit the jitter of the high-frequency narrow-band light beam, and the PI control has good inhibition capability on the jitter of the low-frequency wide-band light beam, so that the correction residual error is greatly reduced, the control bandwidth is improved, and the real-time performance is high.
Description
technical field [0001] The invention belongs to the technical field of wave front processing and control, and relates to a method for suppressing beam jitter based on an LQG+PI hybrid control strategy, which is suitable for wave front processing of an adaptive optical system. Background technique [0002] During the beam propagation process, due to the interference of external factors, the optical axis of the beam will be deflected, and then the beam propagation direction will continue to change. This phenomenon is called beam jitter, which is mainly composed of low-frequency broadband disturbances caused by transmission media such as atmospheric turbulence and high-frequency narrow-band disturbances caused by vibrations such as mechanical devices and beam platforms. Finding a beam jitter suppression method that effectively suppresses low-frequency disturbances and high-frequency vibrations is a direction that scholars at home and abroad are constantly exploring. The tradit...
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IPC IPC(8): G05B13/04
Inventor 杨康建曾凤娇杨平王帅向立苏春轩赵孟孟晏旭
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI