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Related Experiment Video

Updated: Jun 7, 2025

Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer
05:00

Measuring Dissolved Methane in Aquatic Ecosystems Using An Optical Spectroscopy Gas Analyzer

Published on: July 26, 2024

407

An Underwater Methane Sensor Based on Laser Spectroscopy in a Hollow Core Optical Fiber.

Jason A Kapit1, Sarah Youngs1, William A Pardis1

  • 1Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, Massachusetts 02543, United States.

ACS Sensors
|November 11, 2024
PubMed
Summary

This study introduces a new underwater sensor for dissolved methane, offering faster response times and a compact design. The innovative hollow core fiber spectrometer enables precise, real-time methane measurements in marine environments.

Keywords:
hollow core fibermethaneoceansensorunderwater

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Area of Science:

  • Oceanography
  • Environmental Science
  • Spectroscopy

Background:

  • In situ dissolved methane sensors often exhibit slow response times, large size, and complexity.
  • Accurate and efficient measurement of dissolved methane is crucial for understanding marine biogeochemical cycles.

Purpose of the Study:

  • To develop and characterize a novel, compact, and responsive sensor for in situ dissolved methane detection.
  • To demonstrate the sensor's capability for underwater methane mapping and profiling.

Main Methods:

  • Utilized a hollow core optical fiber (HFC) as the detection cell within an underwater infrared laser spectrometer.
  • Employed a polymer membrane inlet for continuous dissolved gas extraction from water.
  • Applied tunable diode laser spectroscopy for methane quantification within the HCF.

Main Results:

  • A submersible prototype was developed and tested to depths of 2000 m.
  • Laboratory tests showed a methane partial pressure (pCH4) detection range up to 10,000 μatm with high accuracy (±1.4% or 5.6 μatm).
  • Achieved a rapid response time of 4.6 minutes under controlled conditions.

Conclusions:

  • The hollow core fiber spectrometer offers significant advantages in sensitivity, selectivity, compactness, and response time for dissolved methane sensing.
  • The developed sensor is effective for generating dissolved methane maps, targeted sampling, and water column profiling in oceanic environments.