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Sensors 2018, 18(2), 508; https://doi.org/10.3390/s18020508

H∞ Robust Control of a Large-Piston MEMS Micromirror for Compact Fourier Transform Spectrometer Systems

1
School of Mechanical Engineering, HangZhou DianZi University, Hangzhou 310018, China
2
Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA
3
College of Mechanical and Electronic Engineering, Shangdong University of Science and Technology, Qingdao 266590, China
4
School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
*
Author to whom correspondence should be addressed.
Received: 10 November 2017 / Revised: 24 January 2018 / Accepted: 31 January 2018 / Published: 8 February 2018
(This article belongs to the Special Issue Smart Sensors for Mechatronic and Robotic Systems)

Abstract

Incorporating linear-scanning micro-electro-mechanical systems (MEMS) micromirrors into Fourier transform spectral acquisition systems can greatly reduce the size of the spectrometer equipment, making portable Fourier transform spectrometers (FTS) possible. How to minimize the tilting of the MEMS mirror plate during its large linear scan is a major problem in this application. In this work, an FTS system has been constructed based on a biaxial MEMS micromirror with a large-piston displacement of 180 μm, and a biaxial H∞ robust controller is designed. Compared with open-loop control and proportional-integral-derivative (PID) closed-loop control, H∞ robust control has good stability and robustness. The experimental results show that the stable scanning displacement reaches 110.9 μm under the H∞ robust control, and the tilting angle of the MEMS mirror plate in that full scanning range falls within ±0.0014°. Without control, the FTS system cannot generate meaningful spectra. In contrast, the FTS yields a clean spectrum with a full width at half maximum (FWHM) spectral linewidth of 96 cm−1 under the H∞ robust control. Moreover, the FTS system can maintain good stability and robustness under various driving conditions. View Full-Text
Keywords: electrothermal micromirror; robust control; bimorph actuator modeling; active tilting rejection; Fourier transform spectrometer electrothermal micromirror; robust control; bimorph actuator modeling; active tilting rejection; Fourier transform spectrometer
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Chen, H.; Li, M.; Zhang, Y.; Xie, H.; Chen, C.; Peng, Z.; Su, S. H∞ Robust Control of a Large-Piston MEMS Micromirror for Compact Fourier Transform Spectrometer Systems. Sensors 2018, 18, 508.

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