Authors: W B Yan Y Chen H Chen C Krusen P T Woods
Publish Date: 2008/06/18
Volume: 29, Issue: 5, Pages: 1567-1577
Abstract
Continuouswave cavity ringdown spectroscopy CWCRDS using continuouswave lasers is now in widespread use for the sensitive detection of a range of different tracegas 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 watervapor species The developments that have been carried out to achieve this will be discussed and some of the applications covering single sensors and multihead 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 ringdown 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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