Fourier transform and grating-based spectroscopy with a mid-infrared supercontinuum source for trace gas detection in fruit quality monitoring

We present a multi-species trace gas sensor based on a fast, compact home-built Fourier transform spectrometer (FTS) combined with a broadband mid-infrared supercontinuum (SC) source. The spectrometer covers the spectral bandwidth of the SC source (2 - 4 µm) and provides a best spectral resolution o...

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Bibliographic Details
Published in:Optics express 2021-04, Vol.29 (8), p.12381-12397
Main Authors: Jahromi, Khalil Eslami, Nematollahi, Mohammadreza, Krebbers, Roderik, Abbas, Muhammad Ali, Khodabakhsh, Amir, Harren, Frans J M
Format: Article
Language:English
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Summary:We present a multi-species trace gas sensor based on a fast, compact home-built Fourier transform spectrometer (FTS) combined with a broadband mid-infrared supercontinuum (SC) source. The spectrometer covers the spectral bandwidth of the SC source (2 - 4 µm) and provides a best spectral resolution of 1 GHz in 6 seconds. It has a detection sensitivity of a few hundred of ppbv Hz for different gas species. We study the performance of the developed spectrometer in terms of precision, linearity, long-term stability, and multi-species detection. We use the spectrometer for measuring fruit-produced volatiles under different atmospheric conditions and compare the performance with a previously developed scanning grating-based spectrometer.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.418072