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Proceedings Paper

A method of incident angle estimation for high resolution spectral recovery in filter-array-based spectrometers
Author(s): Cheolsun Kim; Woong-Bi Lee; Gun Wu Ju; Jeonghoon Cho; Seongmin Kim; Jinkyung Oh; Dongsung Lim; Yong Tak Lee; Heung-No Lee
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Paper Abstract

In recent years, there has been an increasing interest in miniature spectrometers for research and development. Especially, filter-array-based spectrometers have advantages of low cost and portability, and can be applied in various fields such as biology, chemistry and food industry. Miniaturization in optical filters causes degradation of spectral resolution due to limitations on spectral responses and the number of filters. Nowadays, many studies have been reported that the filter-array-based spectrometers have achieved resolution improvements by using digital signal processing (DSP) techniques. The performance of the DSP-based spectral recovery highly depends on the prior information of transmission functions (TFs) of the filters. The TFs vary with respect to an incident angle of light onto the filter-array. Conventionally, it is assumed that the incident angle of light on the filters is fixed and the TFs are known to the DSP. However, the incident angle is inconstant according to various environments and applications, and thus TFs also vary, which leads to performance degradation of spectral recovery. In this paper, we propose a method of incident angle estimation (IAE) for high resolution spectral recovery in the filter-array-based spectrometers. By exploiting sparse signal reconstruction of the L1- norm minimization, IAE estimates an incident angle among all possible incident angles which minimizes the error of the reconstructed signal. Based on IAE, DSP effectively provides a high resolution spectral recovery in the filter-array-based spectrometers.

Paper Details

Date Published: 20 February 2017
PDF: 6 pages
Proc. SPIE 10117, Emerging Digital Micromirror Device Based Systems and Applications IX, 101170K (20 February 2017); doi: 10.1117/12.2251138
Show Author Affiliations
Cheolsun Kim, Gwangju Institute of Science and Technology (Korea, Republic of)
Woong-Bi Lee, Gwangju Institute of Science and Technology (Korea, Republic of)
Gun Wu Ju, Gwangju Institute of Science and Technology (Korea, Republic of)
Jeonghoon Cho, P-Cube Co., Ltd. (Korea, Republic of)
Seongmin Kim, P-Cube Co., Ltd. (Korea, Republic of)
Jinkyung Oh, P-Cube Co., Ltd. (Korea, Republic of)
Dongsung Lim, P-Cube Co., Ltd. (Korea, Republic of)
Yong Tak Lee, Gwangju Institute of Science and Technology (Korea, Republic of)
Heung-No Lee, Gwangju Institute of Science and Technology (Korea, Republic of)


Published in SPIE Proceedings Vol. 10117:
Emerging Digital Micromirror Device Based Systems and Applications IX
Michael R. Douglass; Benjamin L. Lee, Editor(s)

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