Acta Photonica Sinica, Volume. 51, Issue 6, 0601002(2022)
Sliding Mode Control of Tip-tilt Mirror Based on Disturbance Observer
Tip-tilt mirror is a type of precision optical equipment that controls the direction of beam propagation in modern photoelectric systems. It has been utilized in space laser communications, adaptive optics, vehicle/airborne laser systems, image stabilization, astronomical telescopes, confocal microscopy, real-time laser scanning, capture target tracking, and other applications. The tip-tilt mirror is used in adaptive optics to correct the phase wavefront caused by atmospheric turbulence, which accounts for approximately 87% of the overall tilt. As a result, the tip-tilt mirror helps to rectify the first-order tilt of the system.The closed-loop performance of the adaptive optics system is severely harmed because the tip-tilt mirror is susceptible to wind vibration, equipment vibration, and platform vibration. As a result, the vibration must be minimized to approach the diffraction limit of optics. The standard closed-loop feedback control is ineffective in suppressing the vibration of the tip-tilt mirror, reducing closed-loop performance. In consequence, research into novel anti-vibration technology is critical to improving the closed-loop performance of the tip-tilt mirror. There are numerous methods for reducing vibration in use today. For example, literature offered a disturbance-based feedforward control method to suppress structural vibration of the tip-tilt mirror system, which involved measuring the disturbance with an accelerometer or a gyroscope and then feeding the disturbance with signal reconstruction. Returning to the system, the controller is not limited by low-rate sampling because it can produce a large suppression bandwidth. Additional measurement equipment, on the other hand, will raise the cost of the system as well as its complexity and analytical difficulty. Accelerometers or gyroscopes suffer from severe low-frequency drift and high-frequency noise. Existing control systems face extra control issues as a result of the accuracy of vibration estimation. Many enhanced control structures and optimized controllers, such as the Linear Quadratic Gaussian controller (LQG) and
Get Citation
Copy Citation Text
Dechun ZHAO, Yansong SONG, Yang LIU, Yan DONG, Baishuo ZHANG. Sliding Mode Control of Tip-tilt Mirror Based on Disturbance Observer[J]. Acta Photonica Sinica, 2022, 51(6): 0601002
Category:
Received: Jan. 6, 2022
Accepted: Jan. 27, 2022
Published Online: Sep. 23, 2022
The Author Email: SONG Yansong (songyansong2006@126.com)