A near-infrared laser dispersion spectrometer with phase modulation for open-path methane sensing

Author:

Wall Thomas E.1ORCID,Macleod Neil A.1ORCID,Weidmann Damien1ORCID

Affiliation:

1. Space Science and Technology Department (RAL Space), STFC Rutherford Appleton Laboratory, Harwell Campus , Didcot, Oxfordshire OX11 0QX, United Kingdom

Abstract

A laser-based open-path dispersion spectrometer for measuring atmospheric methane has been developed with the goal of achieving a very simple architecture, yet enabling molecular dispersion measurements immune to optical power variation. Well-mature, near-infrared photonics components were retained to demonstrate a compact, cost-effective, and low-power consumption dispersion spectrometer. In particular, measurements immune to received optical power variations are demonstrated despite the use of only phase modulation and are supported by the development of the corresponding physical model. The instrument has been validated under laboratory conditions, finding a precision of 2.6 ppb 100 m for a 2 s measurement, and demonstrated through atmospheric measurements performed continuously over six days with an 86 m path length.

Funder

Innovate UK

Science and Technology Facilities Council

Publisher

AIP Publishing

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