Affordable Access

Access to the full text

Compact Open-Path Sensor for Fast Measurements of CO 2 and H 2O using Scanned-Wavelength Modulation Spectroscopy with 1f -Phase Method

Authors
  • Li, Xiang
  • Yuan, Feng1
  • Hu, Mai1
  • Chen, Bin1
  • He, Yabai1
  • Yang, Chenguang
  • Shi, Lifang
  • Kan, Ruifeng1, 2
  • 1 (Y.H.)
  • 2 State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
Type
Published Article
Journal
Sensors
Publisher
MDPI AG
Publication Date
Mar 30, 2020
Volume
20
Issue
7
Identifiers
DOI: 10.3390/s20071910
PMID: 32235470
PMCID: PMC7181033
Source
PubMed Central
Keywords
License
Green

Abstract

We report here the development of a compact, open-path CO2 and H2O sensor based on the newly introduced scanned-wavelength modulation spectroscopy with the first harmonic phase angle (scanned-WMS-θ 1f ) method for high-sensitivity, high temporal resolution, ground-based measurements. The considerable advantage of the sensor, compared with existing commercial ones, lies in its fast response of 500 Hz that makes this instrument ideal for resolving details of high-frequency turbulent motion in exceptionally dynamic coastal regions. The good agreement with a commercial nondispersive infrared analyzer supports the utility and accuracy of the sensor. Allan variance analysis shows that the concentration measurement sensitivities can reach 62 ppb CO2 in 0.06 s and 0.89 ppm H2O vapor in 0.26 s averaging time. Autonomous field operation for 15-day continuous measurements of greenhouse gases (CO2/H2O) was performed on a shore-based monitoring tower in Daya Bay, demonstrating the sensor’s long-term performance. The capability for high-quality fast turbulent atmospheric gas observations allow the potential for better characterization of oceanographic processes.

Report this publication

Statistics

Seen <100 times