Model-Based, Closed-Loop Control of PZT Creep for Cavity Ring-Down Spectroscopy.
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.
Department of Mechanical Engineering, Stanford University, USA ; Center for Accelerator Mass Spectrometry, Lawrence Livermore National Lab, USA.
A D
AD
McCartt
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Lab, USA.
T J
TJ
Ognibene
Center for Accelerator Mass Spectrometry, Lawrence Livermore National Lab, USA.
G
G
Bench
Biology and Biotechnology Division, Lawrence Livermore National Lab, USA.
K W
KW
Turteltaub
CRDS; PZT; cavity; control; creep; spectroscopy