Control issues of MEMS nanopositioning devices

Yong Zhu, Seyed O Reza Moheimani, Mehmet Yuce, Ali Bazaei

Research output: Chapter in Book/Report/Conference proceedingChapter (Book)Otherpeer-review

Abstract

In this chapter, the control issues of microelectromechanical system (MEMS) nanopositioning devices are introduced and discussed. The real-time feedback control of a novel micro-machined 1-degree-of-freedom (1-DoF) thermal nanopositioner with on-chip electrothermal position sensors is presented. The actuation works based on the thermal expansion of V-shaped silicon beams. The sensing mechanism works based on measuring the resistance difference between two electrically biased identical silicon beams. The resistance difference varies with displacement. The heat conductance of the sensor beams varies oppositely with the position of the movable stage, resulting in different beam temperatures and resistances. A pair of position sensors are operated in differential mode to reduce low-frequency drift. The micro-machined nanopositioner has a nonlinear static input-output characteristic. The electrothermal actuator has a dynamic range of 14.4 µm and the electrothermal sensor has a low drift of 8.9 nm over 2000 s. An open-loop controller is first designed and implemented. It is experimentally shown that uncertainties result in unacceptable positioning performance. Hence, feedback control is required for accurate positioning. The on-chip displacement sensor is able to provide high-resolution displacement control. Therefore, a real-time closed-loop feedback control system is designed using a proportional-integral (PI) controller together with the nonlinear compensator used for the open-loop control system. The closed-loop system provides acceptable and robust tracking resolution for a wide range of set point values. The step response results show a positioning resolution of 7.9 nm and a time constant of 1.6 ms in a 10 µm stroke. For triangular reference tracking, which is required in raster-scanned scanning probe microscopy (SPM), the steady-state tracking error has a standard deviation of 20 nm within a wide range of 10 µm.

Original languageEnglish
Title of host publicationNanopositioning Technologies
Subtitle of host publicationFundamentals and Applications
EditorsChanghai Ru, Xinyu Liu, Yu Sun
Place of PublicationSwitzerland
PublisherSpringer
Pages325-346
Number of pages22
ISBN (Electronic)9783319238531
ISBN (Print)9783319238524
DOIs
Publication statusPublished - 2016

Keywords

  • Electrothermal actuation
  • Electrothermal position sensing
  • Feedback control
  • Microelectromechanical systems (MEMS)
  • Nanopositioning

Cite this

Zhu, Y., Moheimani, S. O. R., Yuce, M., & Bazaei, A. (2016). Control issues of MEMS nanopositioning devices. In C. Ru, X. Liu, & Y. Sun (Eds.), Nanopositioning Technologies: Fundamentals and Applications (pp. 325-346). Switzerland: Springer. https://doi.org/10.1007/978-3-319-23853-1_10
Zhu, Yong ; Moheimani, Seyed O Reza ; Yuce, Mehmet ; Bazaei, Ali. / Control issues of MEMS nanopositioning devices. Nanopositioning Technologies: Fundamentals and Applications. editor / Changhai Ru ; Xinyu Liu ; Yu Sun. Switzerland : Springer, 2016. pp. 325-346
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Zhu, Y, Moheimani, SOR, Yuce, M & Bazaei, A 2016, Control issues of MEMS nanopositioning devices. in C Ru, X Liu & Y Sun (eds), Nanopositioning Technologies: Fundamentals and Applications. Springer, Switzerland, pp. 325-346. https://doi.org/10.1007/978-3-319-23853-1_10

Control issues of MEMS nanopositioning devices. / Zhu, Yong; Moheimani, Seyed O Reza; Yuce, Mehmet; Bazaei, Ali.

Nanopositioning Technologies: Fundamentals and Applications. ed. / Changhai Ru; Xinyu Liu; Yu Sun. Switzerland : Springer, 2016. p. 325-346.

Research output: Chapter in Book/Report/Conference proceedingChapter (Book)Otherpeer-review

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N2 - In this chapter, the control issues of microelectromechanical system (MEMS) nanopositioning devices are introduced and discussed. The real-time feedback control of a novel micro-machined 1-degree-of-freedom (1-DoF) thermal nanopositioner with on-chip electrothermal position sensors is presented. The actuation works based on the thermal expansion of V-shaped silicon beams. The sensing mechanism works based on measuring the resistance difference between two electrically biased identical silicon beams. The resistance difference varies with displacement. The heat conductance of the sensor beams varies oppositely with the position of the movable stage, resulting in different beam temperatures and resistances. A pair of position sensors are operated in differential mode to reduce low-frequency drift. The micro-machined nanopositioner has a nonlinear static input-output characteristic. The electrothermal actuator has a dynamic range of 14.4 µm and the electrothermal sensor has a low drift of 8.9 nm over 2000 s. An open-loop controller is first designed and implemented. It is experimentally shown that uncertainties result in unacceptable positioning performance. Hence, feedback control is required for accurate positioning. The on-chip displacement sensor is able to provide high-resolution displacement control. Therefore, a real-time closed-loop feedback control system is designed using a proportional-integral (PI) controller together with the nonlinear compensator used for the open-loop control system. The closed-loop system provides acceptable and robust tracking resolution for a wide range of set point values. The step response results show a positioning resolution of 7.9 nm and a time constant of 1.6 ms in a 10 µm stroke. For triangular reference tracking, which is required in raster-scanned scanning probe microscopy (SPM), the steady-state tracking error has a standard deviation of 20 nm within a wide range of 10 µm.

AB - In this chapter, the control issues of microelectromechanical system (MEMS) nanopositioning devices are introduced and discussed. The real-time feedback control of a novel micro-machined 1-degree-of-freedom (1-DoF) thermal nanopositioner with on-chip electrothermal position sensors is presented. The actuation works based on the thermal expansion of V-shaped silicon beams. The sensing mechanism works based on measuring the resistance difference between two electrically biased identical silicon beams. The resistance difference varies with displacement. The heat conductance of the sensor beams varies oppositely with the position of the movable stage, resulting in different beam temperatures and resistances. A pair of position sensors are operated in differential mode to reduce low-frequency drift. The micro-machined nanopositioner has a nonlinear static input-output characteristic. The electrothermal actuator has a dynamic range of 14.4 µm and the electrothermal sensor has a low drift of 8.9 nm over 2000 s. An open-loop controller is first designed and implemented. It is experimentally shown that uncertainties result in unacceptable positioning performance. Hence, feedback control is required for accurate positioning. The on-chip displacement sensor is able to provide high-resolution displacement control. Therefore, a real-time closed-loop feedback control system is designed using a proportional-integral (PI) controller together with the nonlinear compensator used for the open-loop control system. The closed-loop system provides acceptable and robust tracking resolution for a wide range of set point values. The step response results show a positioning resolution of 7.9 nm and a time constant of 1.6 ms in a 10 µm stroke. For triangular reference tracking, which is required in raster-scanned scanning probe microscopy (SPM), the steady-state tracking error has a standard deviation of 20 nm within a wide range of 10 µm.

KW - Electrothermal actuation

KW - Electrothermal position sensing

KW - Feedback control

KW - Microelectromechanical systems (MEMS)

KW - Nanopositioning

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BT - Nanopositioning Technologies

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Zhu Y, Moheimani SOR, Yuce M, Bazaei A. Control issues of MEMS nanopositioning devices. In Ru C, Liu X, Sun Y, editors, Nanopositioning Technologies: Fundamentals and Applications. Switzerland: Springer. 2016. p. 325-346 https://doi.org/10.1007/978-3-319-23853-1_10