Model-based, closed-loop control of PZT creep for cavity ring-down spectroscopy

A. D. McCartt, T. J. Ognibene, G. Bench, Ken W Turteltaub

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Cavity ring-down spectrometers typically employ a PZT stack to modulate the cavity transmission spectrum. While PZTs ease instrument complexity and aid measurement sensitivity, PZT hysteresis hinders the implementation of cavity-length-stabilized, data-acquisition routines. Once the cavity length is stabilized, the cavity's free spectral range imparts extreme linearity and precision to the measured spectrum's wavelength axis. Methods such as frequency-stabilized cavity ring-down spectroscopy have successfully mitigated PZT hysteresis, but their complexity limits commercial applications. Described herein is a single-laser, model-based, closed-loop method for cavity length control.

Original languageEnglish (US)
Article number095201
JournalMeasurement Science and Technology
Issue number9
StatePublished - Sep 1 2014
Externally publishedYes


  • cavity
  • control
  • CRDS
  • creep
  • PZT
  • spectroscopy

ASJC Scopus subject areas

  • Applied Mathematics
  • Instrumentation


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