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Integral force feedback control with input shaping: Application to piezo-based scanning systems in ECDLs.

Meng Zhang1, Zhigang Liu1, Yu Zhu1

  • 1Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University, Xi'an 710049, China.

The Review of Scientific Instruments
|August 3, 2017
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Summary
This summary is machine-generated.

This study introduces a hybrid control system combining integral force feedback (IFF) and input shaping to enhance piezo-based scanning systems. The novel approach effectively eliminates hysteresis and reduces vibrations, enabling faster scanning speeds for lasers.

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Area of Science:

  • * Control Systems Engineering
  • * Mechanical Engineering
  • * Optical Engineering

Background:

  • * Piezo-based scanning systems face challenges with hysteresis and dynamic behavior, limiting scanning speed.
  • * Existing control methods struggle to fully address mechanical resonance and non-linearity.
  • * Tunable external cavity diode lasers require high-speed, precise scanning for optimal performance.

Purpose of the Study:

  • * To develop a hybrid control system integrating integral force feedback (IFF) and input shaping.
  • * To overcome hysteresis and dynamic non-linearities in piezo-based scanning systems.
  • * To increase the scanning speed of tunable external cavity diode lasers.

Main Methods:

  • * Analysis of flexible hinges and piezoelectric actuators to establish a dynamic model.
  • * Implementation of integral force feedback (IFF) using a force sensor and integral controller for damping.
  • * Application of time-domain input shaping based on minimum-acceleration trajectory planning to control resonance.

Main Results:

  • * Integral force feedback (IFF) effectively eliminated hysteresis in the scanning systems.
  • * Mechanical resonance was significantly reduced, though initial residual vibrations were observed.
  • * The hybrid IFF and input shaping approach demonstrated effectiveness in controlling non-linearity and resonance.

Conclusions:

  • * The proposed hybrid control system successfully addresses limitations in piezo-based scanning.
  • * Combining IFF with input shaping enhances system stability and performance.
  • * The developed approach enables higher scanning speeds for applications like tunable lasers.