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

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...

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Veröffentlicht in:	Review of scientific instruments 2024-02, Vol.95 (2)
Hauptverfasser:	Wall, Thomas E., Macleod, Neil A., Weidmann, Damien
Format:	Artikel
Sprache:	eng
Schlagworte:	Dispersion Infrared lasers Infrared spectrometers Laser applications Methane Near infrared radiation Phase modulation Power consumption
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creator	Wall, Thomas E. Macleod, Neil A. Weidmann, Damien
description	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.
doi_str_mv	10.1063/5.0170281
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subjects	Dispersion Infrared lasers Infrared spectrometers Laser applications Methane Near infrared radiation Phase modulation Power consumption
title	A near-infrared laser dispersion spectrometer with phase modulation for open-path methane sensing
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