MERCURY VAPOR TRACE DETECTION USING PRE-EXCITATION CAVITY RING DOWN SPECTROSCOPY
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United States of America Patent
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Issued Date -
Oct 1, 2015
app pub date -
Oct 11, 2013
filing date -
Oct 12, 2012
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Abstract
Apparatus and techniques can include optically exciting an analyte gas in an optically-resonant cavity using optical energy having a first range of wavelengths including a wavelength specified to provide a metastable excited state of a species to be probed in the analyte gas. Such optical excitation can be referred to as “pre-excitation.” Optical energy having a second range of wavelengths can be coupled to the optically resonant cavity, including a wavelength specified to be absorbed using the metastable excited state of the species to be probed in the analyte gas, and outcoupled to a detector. One or more of a decay rate or a decay duration (e.g., a “ring-down” characteristic) can be monitored, such as to determine a presence or quantity of the species in the analyte gas. Such pre-excitation and probing can be referred to as Pre-Excitation Cavity Ring-Down Spectroscopy (PE-CRDS), such as for trace detection of mercury.
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