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400– to 1000–nm imaging spectrometer based on acousto-optic tunable filters

[+] Author Affiliations
Javier Calpe-Maravilla, Joan Vila-Frances, Emilio Ribes-Gomez

University of Valencia, Department of Electronic Engineering, C/Doctor Moliner 50, 46100, Burjassot, Spain

Vicente Duran-Bosch

University Jaume I, Department of Experimental Sciences (Optics), Castellon, Spain

Jordi Munoz-Mari, Julia Amoros-Lopez, Luis Gomez-Chova

University of Valencia, Department of Electronic Engineering, C/Doctor Moliner 50, 46100, Burjassot, Spain

Enrique Tajahuerce-Romera

University Jaume I, Department of Experimental Sciences (Optics), Castellon, Spain

J. Electron. Imaging. 15(2), 023001 (May 09, 2006). doi:10.1117/1.2201057
History: Received January 25, 2005; Revised October 17, 2005; Accepted November 28, 2005; Published May 09, 2006
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An imaging spectrometer covering the 400– to 1000–nm band is conceived and developed. The system is based on an acousto-optic tunable filter (AOTF) attached to a high-performance digital camera. The AOTF enables the selection of spectral bands with an rf signal in the range of 70 to 218 MHz. It includes a telecentric optical system that enhances system efficiency. Additionally, a smart choice of integration time reduces the dependence of the efficiency on the frequency. Calibration includes filter characterization and compensation of crystal nonconstant diffraction efficiency and spatial nonhomogeneity. The system is controlled by a PC application specifically developed for this purpose, providing wide versatility, while enabling transparent and intuitive management to nonexpert users. The spectrometer is validated by estimating the light absorption of leaves and their chlorophyll content.

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© 2006 SPIE and IS&T

Citation

Javier Calpe-Maravilla ; Joan Vila-Frances ; Emilio Ribes-Gomez ; Vicente Duran-Bosch ; Jordi Munoz-Mari, et al.
"400– to 1000–nm imaging spectrometer based on acousto-optic tunable filters", J. Electron. Imaging. 15(2), 023001 (May 09, 2006). ; http://dx.doi.org/10.1117/1.2201057


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