Development and Applications of Continuous-Wave Cavity Ring-Down Spectroscopy |
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Authors: | W B Yan Y Chen H Chen C Krusen P T Woods |
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Affiliation: | (1) Tiger Optics, LLC, Warrington, PA 18976-2426, USA;(2) National Physical Laboratory, Teddington, Middlesex, TW11 0LW, UK |
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Abstract: | Continuous-wave cavity ring-down spectroscopy (CW-CRDS) (using continuous-wave lasers) is now in widespread use for the sensitive
detection of a range of different trace-gas species, including water vapor as a very important trace contaminant in many gases.
It has also now been applied to monitor trace water vapor in a range of matrix gases, including those that are corrosive and
have the potential for spectral interference with the target water-vapor species. The developments that have been carried
out to achieve this will be discussed, and some of the applications, covering single sensors and multi-head sensors, will
be presented. One limitation of the current sensor technology is that it uses mirrors that are highly reflective over a very
restricted spectral range, and this limits a given sensor to the measurement of one or two gaseous species. Measurements of
other species require the mirrors to be changed, as it is not currently practical to obtain mirrors with the required high
reflectivity that also cover a large spectral range. The development of a new type of ring-down cavity that uses uncoated
reflective optics, and which can be used from the ultraviolet to the infrared spectral regions, is presented. Examples of
industrial and scientific applications are also presented. |
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Keywords: | Industrial processes Monitoring Ring-down spectroscopy Water vapor |
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