THERMAL DETECTORS OF UNCOOLED MULTI-ELEMENT INFRARED IMAGING ARRAYS. II. NEW THERMALLY UNINSULATED ELEMENTS
S. D. Ivanov, E. G. Kostsov
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 1, Novosibirsk, 630090 Russia
Keywords: инфракрасная техника, тепловые приёмники излучения, пироэлектрические плёнки, мегапиксельная матрица, пироэлектрический заряд, температуропроводность, infrared equipment, thermal detectors of infrared radiation, pyroelectric films, megapixel array, pyroelectric charge, thermal diffusion
Abstract
A new approach to constructing the thermal element of a multi-element array on the basis of thin pyroelectric films is developed: the element is neither thermally insulated from the substrate nor separated by a gap from the substrate surface; instead, it operates owing to accumulation of the charge generated by infrared radiation during the frame. A new principle of high-speed modulation of radiation is described. Experimental results for the behavior of the pyroelectric coefficient in barium-strontium niobate films (BaxSr1-xNb2O6), whose values reach up to (1-2)·10-3 C/m2, are presented. It is demonstrated that the specific detectivity of sensitive elements 12 × 12 μm in size in the charge accumulation mode is greater than 109 cm × Hz0.5 ×·W-1.
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