发明名称 |
MERCURY VAPOR TRACE DETECTION USING PRE-EXCITATION CAVITY RING DOWN SPECTROSCOPY |
摘要 |
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. |
申请公布号 |
US2015276586(A1) |
申请公布日期 |
2015.10.01 |
申请号 |
US201314434598 |
申请日期 |
2013.10.11 |
申请人 |
University of Virginia Patent Foundation |
发明人 |
Lehmann Kevin K. |
分类号 |
G01N21/31;G01N21/39 |
主分类号 |
G01N21/31 |
代理机构 |
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代理人 |
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主权项 |
1. A method, comprising:
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; generating optical energy having a second range of wavelengths including a wavelength specified to be absorbed by the metastable excited state of the species to be probed in the analyte gas; coupling the optical energy having the second range of wavelengths to the optically-resonant cavity; outcoupling a portion of the optical energy having the second range of wavelengths from the optically-resonant cavity to an optical detector; and detecting the outcoupled portion of the optical energy using an optical detector. |
地址 |
Charlottesville VA US |