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Proceedings Paper

A technique for phase correction in Fourier transform spectroscopy
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Paper Abstract

Fourier transform spectroscopy (FTS) is a type of spectroscopy that can be used to analyze components in the sample. The basic setup that is commonly used in this technique is “Michelson interferometer”. The interference signal obtained from interferometer can be Fourier transformed into the spectral pattern of the illuminating light source. To experimentally study the concept of the Fourier transform spectroscopy, the project started by setup the Michelson interferometer in the laboratory. The implemented system used a broadband light source in near infrared region (0.81-0.89 μm) and controlled the movable mirror by using computer controlled motorized translation stage. In the early study, there is no sample the interference path. Therefore, the theoretical spectral results after the Fourier transformation of the captured interferogram must be the spectral shape of the light source. One main challenge of the FTS is to retrieve the correct phase information of the inferferogram that relates with the correct spectral shape of the light source. One main source of the phase distortion in FTS that we observed from our system is the non-linear movement of the movable reference mirror of the Michelson interferometer. Therefore, to improve the result, we coupled a monochromatic light source to the implemented interferometer. We simultaneously measured the interferograms of the monochromatic and broadband light sources. The interferogram of the monochromatic light source was used to correct the phase of the interferogram of the broadband light source. The result shows significant improvement in the computed spectral shape.

Paper Details

Date Published: 5 March 2018
PDF: 6 pages
Proc. SPIE 10714, Third International Conference on Photonics Solutions (ICPS2017), 107140U (5 March 2018); doi: 10.1117/12.2300966
Show Author Affiliations
P. Artsang, Suranaree Univ. of Technology (Thailand)
P. Pongchalee, Suranaree Univ. of Technology (Thailand)
K. Palawong, Suranaree Univ. of Technology (Thailand)
C. Buisset, National Astronomical Research Institute of Thailand (Thailand)
P. Meemon, Suranaree Univ. of Technology (Thailand)

Published in SPIE Proceedings Vol. 10714:
Third International Conference on Photonics Solutions (ICPS2017)
Thawatchai Mayteevarunyoo, Editor(s)

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