Simple unimorph deformable mirrors fabricated from piezo buzzers

Pribosek, Jaka; Diaci, Janez; Sinzinger, Stefan

doi:10.1088/0960-1317/26/5/055009

Cited by 8 publications

(2 citation statements)

References 30 publications

(29 reference statements)

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“…And due to the existence of time delay, PID control algorithm cannot predict the disturbance with time-varying characteristics, and it does not have the ability to automatically adjust the control strategy according to the change of the disturbance 9 – 12 Therefore, the overshoot of the control system becomes larger, the stability becomes worse, the adjustment time is prolonged, and it is difficult to ensure the optimal performance of the system.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear active disturbance rejection control for deformable mirror

Chen,

Zhang,

Zhou

et al. 2023

Opt. Eng.

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.The disturbance in the adaptive optical system includes not only the low-frequency broadband disturbance but also the high-frequency narrow-band disturbance caused by the vibration of system components and atmospheric turbulence. A nonlinear active disturbance rejection control (NLADRC) method is proposed to solve the control problem of a deformable mirror under high-frequency narrow-band disturbance. This method does not completely depend on the mathematical model, and the algorithm structure is simple. The differential tracker flattens the abrupt part of the signal, and the extended state observer is used to estimate the disturbance in real time. Finally, the nonlinear control rate is used to compensate the disturbance. The simulation results show that compared with the classical PID control and the classical linear active disturbance rejection control, the NLADRC method can effectively improve the bandwidth of the control system and show good suppression performance against high-frequency narrow-band disturbance, and the system is more robust. Both in time domain and frequency domain, it can accurately track the system state, reduce the system delay and system error, and has better dynamic performance.

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Section: Introductionmentioning

confidence: 99%

Nonlinear active disturbance rejection control for deformable mirror

Chen,

Zhang,

Zhou

et al. 2023

Opt. Eng.

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“…Adaptive optics (AO) is a technology that enables us to achieve complex aberration corrections for a wide range of applications [ 1 , 2 ]. Conventional AO systems utilize spatial light modulators [ 3 , 4 ] or solid deformable mirrors (DM) [ 5 , 6 ] to compensate for the phase fluctuations that result from non-uniformity in the properties of the medium through which light travels or imperfections in the geometry of the optical components. The spatial light modulators are available in both reflective as well as transparent modes.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Fluid Deformable Mirror with a Two-Layer Layout of Actuators †

Kong

Zhu

et al. 2017

Micromachines

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In this paper, a new type of magnetic fluid deformable mirror (MFDM) with a two-layer layout of actuators is proposed to improve the correction performance for full-order aberrations with a high spatial resolution. The shape of the magnetic fluid surface is controlled by the combined magnetic field generated by the Maxwell coil and the two-layer array of miniature coils. The upper-layer actuators which have a small size and high density are used to compensate for small-amplitude high-order aberrations and the lower-layer actuators which have a big size and low density are used to correct large-amplitude low-order aberrations. The analytical model of this deformable mirror is established and the aberration correction performance is verified by the experimental results. As a new kind of wavefront corrector, the MFDM has major advantages such as large stroke, low cost, and easy scalability and fabrication.

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