Dissolved gas sensing using an anti-resonant hollow core optical fiber

Details

• Journal Title:
  Applied Optics
• Personal Author:
  Kapit, Jason ; Michel, Anna P. M.
• NOAA Program & Office:
  OAR (Oceanic and Atmospheric Research)
• Description:
  Sensors that measure dissolved gases directly are needed for environmental, industrial, and biomedical applications. Here we present a hollow core fiber optic sensor capable of measuring dissolved methane gas in liquids using only nanoliters of sample gas. The sensor is based on an anti-resonant hollow core fiber combined with a permeable capillary membrane inlet that extracts gas from the liquid for analysis. Using a small capillary inlet for gas extraction is only possible due to the small amount of sample gas needed for analysis, and it presents new possibilities for dissolved gas analysis in a simple, robust, and compact sensor configuration. We demonstrate the sensing technique using wavelength modulation spectroscopy and measure methane dissolved in water with a 1 σ lower detection limit of 230 ppb, a resolution of 45 ppb, and a response time of ∼ 8 min .
• Keywords:
  Atomic And Molecular Physics, And Optics Electrical And Electronic Engineering Engineering (miscellaneous) Atomic And Molecular Physics, And Optics Electrical And Electronic Engineering Atomic And Molecular Physics, And Optics Electrical And Electronic Engineering
• Source:
  Applied Optics, 60(33), 10354
• DOI:
  https://doi.org/10.1364/ao.439787
• ISSN:
  1559-128X ; 2155-3165
• Format:
  PDF
• Publisher:
  Optica Publishing Group
• Document Type:
  Journal Article
• Funding:
  Grant no. NA18OAR0110354
• Rights Information:
  Other
• Compliance:
  Library
• Main Document Checksum:
  urn:sha256:40c576aef31223e73571979210d0f0c8715b4e2ab5c969def85ac36948e1f33a
• Download URL:
  https://repository.library.noaa.gov/view/noaa/60301/noaa_60301_DS1.pdf
• File Type:
  [PDF - 2.69 MB ]