Fibre-coupled, multiplexed methane detection using range-resolved interferometry

Date published

2021-02-08

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Institute of Physics

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Article

ISSN

2515-7647

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Citation

Bremner J, Kissinger T, Hodgkinson J, Tatam RP. (2021) Fibre-coupled, multiplexed methane detection using range-resolved interferometry. Journal of Physics: Photonics, Volume 3, Issue 2, 2021, Article No. 02LT01

Abstract

We describe the first use of range-resolved interferometric signal processing for measurement of spectral transmission. This was applied to gas sensing using tunable diode laser spectroscopy, allowing the simultaneous and independent measurement of methane concentrations in multiple gas cells. The system uses a single injection-current modulated diode laser and a single photodetector. For three gas cells, we show the ability of the system to measure methane at noise equivalent concentrations of less than 200 ppm for a 0.5 s measurement period and a potential noise equivalent concentration (1σ) of <20 ppm with 150 s averaging time. We further show that cross-talk between cells is below the experimental uncertainty for the system

Description

Software Description

Software Language

Github

Keywords

interferometry, multiplexed, multipoint, gas

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Attribution 4.0 International

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