Spectral Characterization of Near-Infrared Acousto-optic Tunable Filter (AOTF) Hyperspectral Imaging Systems Using Standard Calibration Materials

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Abstract:

In this study, we propose and evaluate a method for spectral characterization of acousto-optic tunable filter (AOTF) hyperspectral imaging systems in the near-infrared (NIR) spectral region from 900 nm to 1700 nm. The proposed spectral characterization method is based on the SRM-2035 standard reference material, exhibiting distinct spectral features, which enables robust non-rigid matching of the acquired and reference spectra. The matching is performed by simultaneously optimizing the parameters of the AOTF tuning curve, spectral resolution, baseline, and multiplicative effects. In this way, the tuning curve (frequency-wavelength characteristics) and the corresponding spectral resolution of the AOTF hyperspectral imaging system can be characterized simultaneously. Also, the method enables simple spectral characterization of the entire imaging plane of hyperspectral imaging systems. The results indicate that the method is accurate and efficient and can easily be integrated with systems operating in diffuse reflection or transmission modes. Therefore, the proposed method is suitable for characterization, calibration, or validation of AOTF hyperspectral imaging systems.

Keywords: ACOUSTO-OPTIC TUNABLE FILTERS; AOTF; CALIBRATION; HYPERSPECTRAL IMAGING; NEAR-INFRARED SPECTROSCOPY; NIR SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/10-05987

Affiliations: 1: University of Ljubljana, Faculty of Electrical Engineering, Laboratory of Imaging Technologies, Ljubljana, Slovenia, Sensum, Computer Vision Systems, Tehnoloski park 21, 1000 Ljubljana, Slovenia. miran.burmen@fe.uni-lj.si 2: University of Ljubljana, Faculty of Electrical Engineering, Laboratory of Imaging Technologies, Ljubljana, Slovenia, Sensum, Computer Vision Systems, Tehnoloski park 21, 1000 Ljubljana, Slovenia

Publication date: April 1, 2011

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