Curtis, E A; Nicholls, L; Black, N C G; Barwood, G P (2023) Frequency modulation laser spectroscopy method for methane isotopologue ratio and total concentration measurements at 1661 nm. Journal of the Optical Society of America B, 40 (6). pp. 1542-1549.
Full text not available from this repository.Abstract
Source identification and accurate measurements of methane gas concentration are key tools necessary for climate change management. Here we present a method for methane isotopologue ratio measurement using a laser-based frequency modulation (FM) spectroscopy technique in the near infrared (NIR) at 1661 nm. We provide lineshape analysis and discuss a fitting algorithm for accurate isotopologue ratio metrology and investigate and minimise the effects of residual amplitude modulation (RAM) on the experimentally produced FM signal lineshape. This FM technique is further evaluated for future development of a cavity-enhanced and noise-immune system capable of isotopologue ratio as well as ultrasensitive trace gas measurements, all accessible using a single distributed feedback (DFB) laser.
Item Type: | Article |
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Keywords: | Frequency modulation spectroscopy, NICE-OHMS, methane detection, methane isotopologue metrology |
Subjects: | Time and Frequency > Optical Frequency Standards and Metrology |
Divisions: | Time & Frequency |
Identification number/DOI: | 10.1364/JOSAB.482727 |
Last Modified: | 08 Nov 2023 15:30 |
URI: | http://eprintspublications.npl.co.uk/id/eprint/9855 |
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