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Model-Based, Closed-Loop Control of PZT Creep for Cavity Ring-Down Spectroscopy.

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Measurement Science & Technology
|November 15, 2014
PubMed
Summary

This study introduces a new single-laser, model-based, closed-loop system to control cavity length in spectrometers. This method overcomes piezoelectric transducer (PZT) hysteresis, improving precision for spectroscopic measurements.

Keywords:
CRDSPZTcavitycontrolcreepspectroscopy

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Area of Science:

  • Spectroscopy
  • Optical Engineering
  • Instrument Science

Background:

  • Cavity ring-down spectrometers commonly use PZT stacks for spectral modulation.
  • PZT hysteresis complicates cavity-length stabilization and precise data acquisition.
  • Existing methods to mitigate hysteresis, like frequency-stabilized cavity ring-down spectroscopy, are complex for commercial use.

Purpose of the Study:

  • To present a novel, simplified method for cavity length control in spectrometers.
  • To address the challenge of PZT hysteresis in achieving stable cavity-length measurements.
  • To enable more accessible and precise spectroscopic data acquisition.

Main Methods:

  • Development of a single-laser, model-based, closed-loop control system.
  • Implementation of a routine for cavity length stabilization.
  • Utilizing the cavity's free spectral range for precise wavelength axis calibration.

Main Results:

  • Demonstration of a closed-loop system effectively controlling cavity length.
  • Mitigation of PZT hysteresis issues without significant added complexity.
  • Achieved high linearity and precision in the measured spectrum's wavelength axis.

Conclusions:

  • The proposed method offers a practical solution for cavity length control in spectrometers.
  • This approach simplifies instrument design while maintaining measurement accuracy.
  • The technique has potential for broader commercial application in spectroscopy.