Trace moisture detection using continuous-wave cavity ring-down spectroscopy.
Trace moisture detection using continuous-wave cavity ring-down spectroscopy.
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DOI：
10.1021/ac0343073
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发表时间：
2003-07
影响因子：
7.4
通讯作者：
J. Dudek;P. Tarsa;A. Velasquez;Mark Wladyslawski;P. Rabinowitz;K. Lehmann
中科院分区：
文献类型：
--
作者：
J. Dudek;P. Tarsa;A. Velasquez;Mark Wladyslawski;P. Rabinowitz;K. Lehmann
We have developed an instrument to measure trace concentrations of small hydride species in gases using continuous-wave cavity ring-down spectroscopy with near-infrared diode laser excitation. An rms baseline equivalent absorbance of 9.2 x 10(-11) cm(-1)/square root(n) is found, where n is the number of ring-down transients. When the 1396.376-nm absorption line of water is used, this corresponds to a noise equivalent moisture concentration in nitrogen gas of 68 pptv/square root(n). Water vapor concentration is detected over a range extending from 3 to 1000 ppbv and found to depend linearly on the concentration as determined by a calibrated commercial moisture sensor.
