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Related Experiment Videos

Trace moisture detection using continuous-wave cavity ring-down spectroscopy.

John B Dudek1, Peter B Tarsa, Armando Velasquez

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.

Analytical Chemistry
|November 25, 2003
PubMed
Summary

We developed a new instrument for measuring trace hydride species in gases. This cavity ring-down spectroscopy system achieves high sensitivity for detecting moisture down to 68 parts-per-trillion by volume.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Environmental Monitoring

Background:

  • Accurate measurement of trace gases is crucial for environmental and industrial applications.
  • Existing methods for detecting small hydride species and moisture may lack sensitivity or specificity.

Purpose of the Study:

  • To develop and validate a novel instrument for measuring trace concentrations of small hydride species in gases.
  • To achieve high sensitivity and a wide dynamic range for moisture detection in nitrogen gas.

Main Methods:

  • Utilized continuous-wave cavity ring-down spectroscopy (CW-CRDS).
  • Employed near-infrared diode laser excitation at 1396.376 nm for water absorption line.
  • Implemented averaging of ring-down transients to improve signal-to-noise ratio.

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Main Results:

  • Achieved an RMS baseline equivalent absorbance of 9.2 x 10(-11) cm(-1)/sqrt(n).
  • Demonstrated a noise-equivalent moisture concentration in nitrogen gas of 68 parts-per-trillion by volume (pptv)/sqrt(n).
  • Successfully detected water vapor concentrations linearly over a range of 3 to 1000 ppbv.

Conclusions:

  • The developed CW-CRDS instrument offers high sensitivity for trace moisture detection.
  • The instrument's performance is validated against a commercial moisture sensor.
  • This technology has potential applications in gas analysis and environmental monitoring.