Microcontroller based resonance tracking unit for time resolved continuous wave cavity-ringdown spectroscopy measurements

The Review of Scientific Instruments
Ondrej VotavaChrista Fittschen

Abstract

We present in this work a new tracking servoloop electronics for continuous wave cavity-ringdown absorption spectroscopy (cw-CRDS) and its application to time resolved cw-CRDS measurements by coupling the system with a pulsed laser photolysis set-up. The tracking unit significantly increases the repetition rate of the CRDS events and thus improves effective time resolution (and/or the signal-to-noise ratio) in kinetics studies with cw-CRDS in given data acquisition time. The tracking servoloop uses novel strategy to track the cavity resonances that result in a fast relocking (few ms) after the loss of tracking due to an external disturbance. The microcontroller based design is highly flexible and thus advanced tracking strategies are easy to implement by the firmware modification without the need to modify the hardware. We believe that the performance of many existing cw-CRDS experiments, not only time-resolved, can be improved with such tracking unit without any additional modification to the experiment.

References

Dec 5, 2002·Applied Optics·Jérĵme MorvilleAlexander Kachanov
Jul 2, 2003·Applied Optics·Nicola J van LeeuwenAndrew C Wilson
Oct 28, 2010·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Chaithanya JainChrista Fittschen

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Citations

Apr 17, 2012·The Journal of Physical Chemistry. a·Chaithanya JainChrista Fittschen
Nov 27, 2015·The Journal of Physical Chemistry. a·Hichem BouzidiAlexandre Tomas
Oct 30, 2016·The Journal of Physical Chemistry. a·Emmanuel AssafChrista Fittschen
Jan 26, 2017·Environmental Science & Technology·Emmanuel AssafChrista Fittschen
Nov 16, 2017·Physical Chemistry Chemical Physics : PCCP·Emmanuel AssafChrista Fittschen
Dec 3, 2016·The Review of Scientific Instruments·Pasquale Arpaia, Pasquale Cimmino
Sep 21, 2013·The Journal of Physical Chemistry. a·M AntiñoloC Fittschen
May 26, 2017·The Journal of Physical Chemistry. a·Christa FittschenLuc Vereecken

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Methods Mentioned

BETA
chip

Software Mentioned

RAMP CONTROL
CRDS
DIL
MCU

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