0394609 - ÚFCH JH 2014 RIV US eng J - Journal Article
Votava, Ondřej - Mašát, Milan - Parker, A. E. - Jain, Ch. - Fittschen, Ch.
Microcontroller based resonance tracking unit for time resolved continuous wave cavity-ringdown spectroscopy measurements.
Review of Scientific Instruments. Roč. 83, č. 4 (2012), 043110. ISSN 0034-6748. E-ISSN 1089-7623
R&D Projects: GA ČR GA203/09/0422
Institutional support: RVO:61388955
Keywords : CW-DIODE-LASER * DOWN SPECTROSCOPY * KINETICS
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 1.602, year: 2012
DOI: https://doi.org/10.1063/1.3698061

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. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3698061]

Permanent Link: http://hdl.handle.net/11104/0222841