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| Titel |
Cavity ring-down spectroscopy sensor for detection of hydrogen chloride |
| VerfasserIn |
C. L. Hagen, B. C. Lee, I. S. Franka, J. L. Rath, T. C. VandenBoer, J. M. Roberts, S. S. Brown, A. P. Yalin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 2 ; Nr. 7, no. 2 (2014-02-03), S.345-357 |
| Datensatznummer |
250115590
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| Publikation (Nr.) |
 copernicus.org/amt-7-345-2014.pdf |
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| Zusammenfassung |
| A laser-based cavity ring-down spectroscopy (CRDS) sensor for measurement of
hydrogen chloride (HCl) has been developed and characterized. The instrument
uses light from a distributed-feedback diode laser at 1742 nm coupled to a
high finesse optical cavity to make sensitive and quantifiable concentration
measurements of HCl based on optical absorption. The instrument has a
(1σ) limit of detection of <20 pptv in 1 min and has high
specificity to HCl. The measurement response time to changes in input HCl
concentration is <15 s. Validation studies with a previously calibrated
permeation tube setup show an accuracy of better than 10%. The CRDS sensor
was preliminarily tested in the field with two other HCl instruments (mist
chamber and chemical ionization mass spectrometry), all of which were in
broad agreement. The mist chamber and CRDS sensors both showed a 400 pptv
plume within 50 pptv agreement. The sensor also allows simultaneous sensitive
measurements of water and methane, and minimal hardware modification would
allow detection of other near-infrared absorbers. |
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