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Proceedings Paper

Compact Fourier transform spectrometer without moving parts
Author(s): Chu-Yu Huang; B. Estroff; Wei-Chih Wang
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Paper Abstract

Fourier transform spectroscopy (FTS) is a potent analytical tool for chemical and biological analysis, but is limited by system size, expense, and robustness. To make FTS technology more accessible, we present a compact, inexpensive FTS system based on a novel liquid crystal (LC) interferometer. This design is unique because the optical path difference (OPD) is controlled by voltage applied to the LC cell. The OPD is further improved by reflecting the polarized incident light through the LC several times before reaching the second polarizer and measurement. This paper presents the theoretical model and numerical simulations for the liquid crystal Fourier transform spectrometer (LCFTS), and experimental results from the prototype. Based on the experimental results, the LCFTS performs in accordance with the theoretical predictions, achieving a maximum OPD of 210μm and a resolution of 1nm at a wavelength of 630nm. The instrumental response refresh rate is just under 1 second. Absorbance measurements were conducted for single and mixed solutions of deionized water and isopropyl alcohol, demonstrating agreement with a commercial system and literature values. We also present the LCFTS transmission spectra for varying concentrations of potassium permanganate to show system sensitivity.

Paper Details

Date Published: 19 April 2012
PDF: 11 pages
Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 83480W (19 April 2012); doi: 10.1117/12.915228
Show Author Affiliations
Chu-Yu Huang, Univ. of Washington (United States)
B. Estroff, Univ. of Washington (United States)
Wei-Chih Wang, Univ. of Washington (United States)
National Cheng Kung Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8348:
Health Monitoring of Structural and Biological Systems 2012
Tribikram Kundu, Editor(s)

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