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Deconvolution in Acousto-Optical Tunable Filter Spectrometry

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Abstract:

Spectrometers and spectral imaging systems based on the acousto-optical tunable filter (AOTF) are becoming commonly used in many different fields in which high spectral resolution is crucial, e.g., laser-induced breakdown spectroscopy, Raman spectroscopy, and absorption spectroscopy of gases. As AOTFs have many advantages over other spectroscopic instruments but lack spectral resolution, a procedure for resolution enhancement, composed of point spread function characterization and spectrum preprocessing and deconvolution, is proposed. Wiener, Fourierwavelet regularized (ForWaRD), Richardson–Lucy, and Wavelet–Lucy deconvolution methods were tested and their performances assessed with two deconvolution quality measures: resolution enhancement and noise amplification. It was shown that the proposed spectral resolution enhancement is feasible and gives good results for line spectra and highly dynamic spectra.

Keywords: ACOUSTO-OPTICAL TUNABLE FILTERS; AOTF; DECONVOLUTION; FORWARD DECONVOLUTION; HYPERSPECTRAL IMAGING; RESOLUTION ENHANCEMENT; RICHARDSON–LUCY DECONVOLUTION; SPECTROMETRY; WAVELET–LUCY DECONVOLUTION; WIENER DECONVOLUTION

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210793334945

Affiliations: 1: University of Ljubljana, Faculty of Electrical Engineering, Ljubljana, Slovenia. jaka.katrasnik@fe.uni-lj.si 2: University of Ljubljana, Faculty of Electrical Engineering, Ljubljana, Slovenia; Sensum, Computer Vision Systems, Ljubljana, Slovenia

Publication date: November 1, 2010

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