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Escárate P, Coronel M, Carvajal R, Agüero JC. An Optimal Integral Controller for Adaptive Optics Systems. SENSORS (BASEL, SWITZERLAND) 2023; 23:9186. [PMID: 38005572 PMCID: PMC10675203 DOI: 10.3390/s23229186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 11/04/2023] [Accepted: 11/07/2023] [Indexed: 11/26/2023]
Abstract
Integral controllers are commonly employed in astronomical adaptive optics. This work presents a novel tuning procedure for integral controllers in adaptive optics systems which relies on information about the measured disturbances. This tuning procedure consists of two main steps. First, it models and identifies measured disturbances as continuous-time-damped oscillators using Whittles´s likelihood and the wavefront sensor output signal. Second, it determines the integral controller gain of the adaptive optics system by minimizing the output variance. The effectiveness of this proposed method is evaluated through theoretical examples and numerical simulations conducted using the Object-Oriented Matlab Adaptive Optics toolbox. The simulation results demonstrate that this approach accurately estimates the disturbance model and can reduce the output variance. Our proposal results in improved performance and better astronomical images even in challenging atmospheric conditions. These findings significantly contribute to adaptive optics system operations in astronomical observatories and establish our procedure as a promising tool for fine-tuning integral controllers in astronomical adaptive optics systems.
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Affiliation(s)
- Pedro Escárate
- School of Electrical Engineering, Pontificia Universidad Católica de Valparaíso (PUCV), Av. Brasil 2147, Valparaíso 2362804, Chile;
| | - María Coronel
- Department of Electricity, Universidad Tecnológica Metropolitana (UTEM), Av. Jose Pedro Alessandri 1242, Santiago 7800002, Chile;
| | - Rodrigo Carvajal
- School of Electrical Engineering, Pontificia Universidad Católica de Valparaíso (PUCV), Av. Brasil 2147, Valparaíso 2362804, Chile;
| | - Juan C. Agüero
- Electronics Engineering Department, Universidad Técnica Federico Santa María, Av. España 1680, Valparaíso 2390123, Chile;
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Kong L, Yang K, Su C, Guo S, Wang S, Cheng T, Yang P. Adaptive Optics Tip-Tilt Correction Based on Smith Predictor and Filter-Optimized Linear Active Disturbance Rejection Control Method. SENSORS (BASEL, SWITZERLAND) 2023; 23:6724. [PMID: 37571508 PMCID: PMC10422630 DOI: 10.3390/s23156724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2023] [Revised: 07/16/2023] [Accepted: 07/19/2023] [Indexed: 08/13/2023]
Abstract
A tip-tilt mirror (TTM) control method is designed to enhance the control bandwidth and ensure the rejection performance of the adaptive optics (AO) tip-tilt correction system. Optimized with the Smith predictor and filter, linear active disturbance rejection (LADRC) is adopted to achieve the tip-tilt correction. An AO tip-tilt correction experimental platform was built to validate the method. Experimental results show that the proposed method improves the control bandwidth of the system by at least 3.6 times compared with proportional-integral (PI) control. In addition, under the same control bandwidth condition, compared with the Smith predictor and proportional-integral (PI-Smith) control method, the system is more capable of rejecting internal and external disturbances, and its dynamic response performance is improved by more than 29%.
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Affiliation(s)
- Lingxi Kong
- Key Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kangjian Yang
- Key Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
| | - Chunxuan Su
- Key Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
| | - Sicheng Guo
- Key Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shuai Wang
- Key Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
| | - Tao Cheng
- Key Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
| | - Ping Yang
- Key Laboratory on Adaptive Optics, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
- Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
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Qiao Y, Cao J, Huang G, Liu H, Lei Y, Liu Q. Improved subspace modal identification of industrial robots. J FIELD ROBOT 2023. [DOI: 10.1002/rob.22158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Yuting Qiao
- Key Laboratory of Education Ministry for Modern Design and Rotor‐Bearing System, School of Mechanical Engineering Xi'an Jiaotong University Xi'an China
| | - Junyi Cao
- Key Laboratory of Education Ministry for Modern Design and Rotor‐Bearing System, School of Mechanical Engineering Xi'an Jiaotong University Xi'an China
| | - Guohui Huang
- Key Laboratory of Education Ministry for Modern Design and Rotor‐Bearing System, School of Mechanical Engineering Xi'an Jiaotong University Xi'an China
| | - Huan Liu
- Key Laboratory of Education Ministry for Modern Design and Rotor‐Bearing System, School of Mechanical Engineering Xi'an Jiaotong University Xi'an China
| | - Yaguo Lei
- Key Laboratory of Education Ministry for Modern Design and Rotor‐Bearing System, School of Mechanical Engineering Xi'an Jiaotong University Xi'an China
| | - Qinghua Liu
- Key Laboratory of Education Ministry for Modern Design and Rotor‐Bearing System, School of Mechanical Engineering Xi'an Jiaotong University Xi'an China
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Coronel M, Carvajal R, Escárate P, Agüero JC. Disturbance Modelling for Minimum Variance Control in Adaptive Optics Systems Using Wavefront Sensor Sampled-Data. SENSORS 2021; 21:s21093054. [PMID: 33925593 PMCID: PMC8123866 DOI: 10.3390/s21093054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/21/2021] [Accepted: 04/24/2021] [Indexed: 11/16/2022]
Abstract
Modern large telescopes are built based on the effectiveness of adaptive optics systems in mitigating the detrimental effects of wavefront distortions on astronomical images. In astronomical adaptive optics systems, the main sources of wavefront distortions are atmospheric turbulence and mechanical vibrations that are induced by the wind or the instrumentation systems, such as fans and cooling pumps. The mitigation of wavefront distortions is typically attained via a control law that is based on an adequate and accurate model. In this paper, we develop a modelling technique based on continuous-time damped-oscillators and on the Whittle’s likelihood method to estimate the parameters of disturbance models from wavefront sensor time-domain sampled-data. On the other hand, when the model is not accurate, the performance of the minimum variance controller is affected. We show that our modelling and identification techniques not only allow for more accurate estimates, but also for better minimum variance control performance. We illustrate the benefits of our proposal via numerical simulations.
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Affiliation(s)
- María Coronel
- Departamento Electrónica, Universidad Técnica Federico Santa María (UTFSM), Av. España 1680, Valparaíso 2390123, Chile; (M.C.); (R.C.); (J.C.A.)
- Advanced Center for Electrical and Electronic Engiennering, AC3E, Av. Matta 222, Valparaíso 2580129, Chile
- Departamento de Ingeniería Electrica, Facultad de Ingeniería, Universidad de Los Andes, Av. Alberto Carnevali, Mérida 5101, Venezuela
| | - Rodrigo Carvajal
- Departamento Electrónica, Universidad Técnica Federico Santa María (UTFSM), Av. España 1680, Valparaíso 2390123, Chile; (M.C.); (R.C.); (J.C.A.)
| | - Pedro Escárate
- Instituto de Electricidad y Electrónica, Facultad de Ciencias de la Ingeniería, Universidad Austral de Chile (UACH), Genaral Lagos 2086, Valdivia 5111187, Chile
- Correspondence:
| | - Juan C. Agüero
- Departamento Electrónica, Universidad Técnica Federico Santa María (UTFSM), Av. España 1680, Valparaíso 2390123, Chile; (M.C.); (R.C.); (J.C.A.)
- Advanced Center for Electrical and Electronic Engiennering, AC3E, Av. Matta 222, Valparaíso 2580129, Chile
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Ran B, Wen L, Zhu L, Yang K, Yang P, Du R, Wang S, Xu B. Coupled dynamic reaction force study of a large-aperture piezoelectric fast steering mirror. APPLIED OPTICS 2021; 60:3393-3402. [PMID: 33983244 DOI: 10.1364/ao.420904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 03/08/2021] [Indexed: 06/12/2023]
Abstract
The reaction force of a large-aperture piezoelectric fast steering mirror (PFSM) has adverse coupling interference for the stability and pointing accuracy of laser beams, and the dynamic characteristics of the reaction force are coupled with the inner components of the PFSM. In order to compensate for and eliminate the reaction force, it is essential to accurately analyze the dynamic characteristics. In this paper, a simplified piezoelectric-coupling model of PFSM is established. The coupling mathematical equations for investigating the characteristics of the reaction force are deducted based on the piezoelectric constitutive equation and Hamiltonian's principle. Then the coupling characteristics of the reaction force are probed by a finite element (FE) piezoelectric-coupling method. The simulations for three large apertures' (250, 320, and 400 mm) FE models show that the reaction force has a linear positive correlation with the actuating voltage, and coupled with the materials of the central flexure hinge, the relationship between the reaction force and driving frequency is not completely quadratic. Experiments with the 320 mm aperture are completed, and the testing results are consistent with the mathematical model and the FE piezoelectric-coupling simulation. The dynamic characteristics of the reaction force demonstrated in this paper are significance for the accurate estimation of the reaction force, the design of compensation structure, and the optimization of algorithm for beam jitter controlling.
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Zhou Z, Feng Z, Xian H, Huang L. Single preloaded piezoelectric-ceramic-stack-actuator-based fast steering mirror with an ultrahigh natural frequency. APPLIED OPTICS 2020; 59:3871-3877. [PMID: 32400654 DOI: 10.1364/ao.387262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 03/23/2020] [Indexed: 06/11/2023]
Abstract
To meet the requirements of the adaptive optics systems with high bandwidths and large excursion angles, we propose a fast steering mirror (FSM) with an ultrahigh natural frequency and a large angular range. The proposed FSM is driven by a preloaded piezoelectric ceramic stack actuator (PCSA), which has a higher shear stress limit in the working direction. We describe the structure of the preloading device and analyze the stiffness improvement of the preloaded PCSA. Then we introduce the structure of the proposed FSM and perform theoretical analysis based on the established static model and dynamical model. We also build an experimental setup of the proposed FSM. The experimental results show that the angular range of the proposed FSM is up to 8.4 mrad, and its first natural frequency is 6660 Hz, which surpass the performances of current FSMs.
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