Sensing of gaseous HF at low part-per-trillion levels using a tunable 2.5-µm diode laser spectrometer operating at ambient pressure

Ian M. Craig, Bret D. Cannon, Matthew S. Taubman, Bruce E. Bernacki, Robert D. Stahl, John T. Schiffern, Tanya L. Myers, Mark C. Phillips

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We demonstrate a sensor based on tunable diode laser absorption spectroscopy for the detection of hydrogen fluoride (HF) gas at ambient pressure. Absorption from the HF R(1) ro-vibrational peak at ν̃ = 4038.962 cm−1 (2.476 µm) in the fundamental (Δν = 1) band is measured. A quantitative spectral fit based on HITRAN data is used to account for overlapping spectral peaks of HF and water vapor, with an rms residual noise of 5 × 10−4 absorbance units. The sensor is optimized for the detection of transient variations in HF concentration. We measure noise-equivalent concentrations for HF of 38 parts-per-trillion by volume (ppt) for 1-s integration times and 2.3 ppt for 10-min integration times.

Original languageEnglish (US)
Pages (from-to)505-515
Number of pages11
JournalApplied Physics B: Lasers and Optics
Volume120
Issue number3
DOIs
StatePublished - Sep 12 2015
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • General Physics and Astronomy

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