11 October 2010 An acousto-optic based hyperspectral imaging camera for security and defence applications
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Abstract
Acousto Optic Tunable Filters (AOTFs) are solid-state, electronically addressable random-access optical pass-band filters, they are also inherently polarisation-selective. Devices with apertures larger than 10mm×10mm suitable for imaging applications are now routinely manufactured. The access time of less than 20μs gives rise to operational speeds significantly faster than is achievable with alternative technologies. These factors can be exploited to realise a polarimetric spectral-imaging system capable of flexible operation at high-speed. Additionally the band-sequential operation with the ability of random access can further increase the operational speed since it is not necessary to sweep continuously across the spectrum and so acquire unwanted data. The addition of further polarising components such as retardation plates further enhance the performance as a polarimeter, with the potential of acquiring the full Stokes parameters. By exploiting the undiffracted 0-order output an RGB image of the scene as viewed through a common objective may be captured, delivering a detailed real-time image to the operator. Any areas of interest identified by the HSI may be highlighted in false-colour on the display.
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J. Ward, J. Ward, M. Farries, M. Farries, C. Pannell, C. Pannell, E. Wachman, E. Wachman, } "An acousto-optic based hyperspectral imaging camera for security and defence applications", Proc. SPIE 7835, Electro-Optical Remote Sensing, Photonic Technologies, and Applications IV, 78350U (11 October 2010); doi: 10.1117/12.864972; https://doi.org/10.1117/12.864972
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