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Sensors 2017, 17(10), 2281; doi:10.3390/s17102281

Novel Semi-Parametric Algorithm for Interference-Immune Tunable Absorption Spectroscopy Gas Sensing

1
https://udata.science, Dübendorf 8600, Switzerland
2
Institute of Applied Mathematics and Physics, Zurich University of Applied Sciences, Winterthur 8401, Switzerland
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 10 September 2017 / Revised: 1 October 2017 / Accepted: 4 October 2017 / Published: 7 October 2017
(This article belongs to the Section Physical Sensors)
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Abstract

One of the most common limits to gas sensor performance is the presence of unwanted interference fringes arising, for example, from multiple reflections between surfaces in the optical path. Additionally, since the amplitude and the frequency of these interferences depend on the distance and alignment of the optical elements, they are affected by temperature changes and mechanical disturbances, giving rise to a drift of the signal. In this work, we present a novel semi-parametric algorithm that allows the extraction of a signal, like the spectroscopic absorption line of a gas molecule, from a background containing arbitrary disturbances, without having to make any assumption on the functional form of these disturbances. The algorithm is applied first to simulated data and then to oxygen absorption measurements in the presence of strong fringes.To the best of the authors’ knowledge, the algorithm enables an unprecedented accuracy particularly if the fringes have a free spectral range and amplitude comparable to those of the signal to be detected. The described method presents the advantage of being based purely on post processing, and to be of extremely straightforward implementation if the functional form of the Fourier transform of the signal is known. Therefore, it has the potential to enable interference-immune absorption spectroscopy. Finally, its relevance goes beyond absorption spectroscopy for gas sensing, since it can be applied to any kind of spectroscopic data. View Full-Text
Keywords: interference; interference cancellation; noise reduction; digital filtering; spectroscopy; sensors interference; interference cancellation; noise reduction; digital filtering; spectroscopy; sensors
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Michelucci, U.; Venturini, F. Novel Semi-Parametric Algorithm for Interference-Immune Tunable Absorption Spectroscopy Gas Sensing. Sensors 2017, 17, 2281.

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