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4 November 2004 400- to 1000-nm imaging spectrometer based on acousto-optic tunable filters
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An imaging spectrometer covering the 400-1000 nm band has been conceived and developed. The system is based on an Acousto-Optic Tunable Filter (AOTF) attached to a high performance digital camera. The AOTF permits the selection of spectral bands with an RF signal in the range of 70-210 MHz. The range is covered using two transducers attached to a single crystal. Although the idea is not new it covers a broader spectrum than previous systems. It includes a telecentric optical system that enhances system efficiency, by ensuring that the chief ray of each light cone emerges out of this doublet parallel to the optical axes. Additionally, an smart choice of integration time reduces the dependence of the efficiency on the frequency. Calibration includes filter characterisation and compensation of crystal non-constant diffraction efficiency and spatial non-homogeneity. The system is controlled by a PC application, specifically developed for this purpose, providing wide versatility, while enabling transparent and intuitive management to typical users.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Javier Calpe-Maravilla, Joan Vila-Frances, Emilio Ribes-Gomez, Vicente Duran-Bosch, Jordi Munoz-Mari, Julia Amoros-Lopez, Luis Gomez-Chova, and Enrique Tajahuerce-Romera "400- to 1000-nm imaging spectrometer based on acousto-optic tunable filters", Proc. SPIE 5570, Sensors, Systems, and Next-Generation Satellites VIII, (4 November 2004);

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