3 May 2010 Advanced dynamic pyroelectric focal plane array
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The pyroelectric effect has been characterized for single-pixel elements consisting of strontium bismuth tantalate (SBT) ferroelectric material as the sensing elements. These pixels have been integrated into second-generation focal plane arrays. The constituent second-generation pixels include thermal insulating layers and an infrared absorber layer. The MEMS-less arrays are operated in active mode, a technique that eliminates radiation choppers found in other passive pyroelectric IR imagers. This paper addresses the results of precursor 2x2 to 14x14 second-generation arrays of SBT elements, the active detection mechanism, and the unique read-out, interrogation signal, and the synchronization electronics. The second-generation 14x14 pixels array was implemented to demonstrate the performance of an active pyroelectric array as a precursor to larger size arrays using different pixel dimensions. The active mode detection eliminates the use of a chopper, enables the dynamic partition of the array into pixel domains in which pixel sensitivity in the domains can be adjusted independently. This unique feature in IR detection can be applied to the simultaneous tracking of diverse contrast objects. In addition, by controlling the thickness of the absorber material the arrays can be optimized for maximum response at specified wavelengths by means of quarter-wavelength interferometry.
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Ricardo A. G. Unglaub, Ricardo A. G. Unglaub, Jolanta B. Celinska, Jolanta B. Celinska, Christopher R. McWilliams, Christopher R. McWilliams, Carlos A. Paz de Araujo, Carlos A. Paz de Araujo, Timothy Forbes, Timothy Forbes, Jayson D. Pankin, Jayson D. Pankin, } "Advanced dynamic pyroelectric focal plane array", Proc. SPIE 7660, Infrared Technology and Applications XXXVI, 76601A (3 May 2010); doi: 10.1117/12.849967; https://doi.org/10.1117/12.849967

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