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Proceedings Paper

Setup and evaluation of a static imaging Fourier transform spectrometer for the mid-infrared spectral range
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Paper Abstract

Hyperspectral imaging is an established technique for process analysis capturing a two-dimensional spatial image and the spectral information for each pixel simultaneously. When moderate spectral resolution is sufficient, static imaging Fourier transform spectrometers (sIFTS) can offer a viable alternative to their scanning counterparts in the mid-infrared spectral range. Therefore, in this paper we present a sIFTS concept based on a single-mirror interferometer which shows no internal light losses and still works with extended light sources, achieving sufficient signal-to-noise ratios. The interferometer consists of a beam splitter, a plane mirror and a lens, which makes it both inexpensive and relatively easy to adjust. For a proof of principle we present a transmission measurement setup including a light source module, imaging optics and a single-mirror interferometer. The system achieves a spectral resolution of 12 cm−1 in a spectral range from 2700 cm−1 to 800 cm−1 , respectively from 3.7 μm to 13 μm. The spatial resolution amounts to about 10.10 lp/mm, the results for a sample containing different polymers show good agreement with a laboratory FTIR spectrometer.

Paper Details

Date Published: 21 June 2019
PDF: 8 pages
Proc. SPIE 11056, Optical Measurement Systems for Industrial Inspection XI, 110561P (21 June 2019); doi: 10.1117/12.2525600
Show Author Affiliations
Michael H. Köhler, Technische Univ. München (Germany)
The Thien Nguyen, Technische Univ. München (Germany)
Patrick Kienle, Technische Univ. München (Germany)
Xingchen Dong, Technische Univ. München (Germany)
Alexander W. Koch, Technische Univ. München (Germany)

Published in SPIE Proceedings Vol. 11056:
Optical Measurement Systems for Industrial Inspection XI
Peter Lehmann; Wolfgang Osten; Armando Albertazzi Gonçalves Jr., Editor(s)

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