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Abstract

A detector assembly for imaging a scene over a predetermined temperature range and a predetermined wavelength range including a central wavelength includes an imaging-sensor array, a plurality of focusing elements and a plurality of optical filtering elements. The imaging-sensor array includes a plurality of detector-array sections and the focusing elements are arranged with respect to the detector array such that each focusing element is capable of focusing upon a corresponding one of the detector-array sections an image of the scene correlating to the image of the scene that each of the other focusing elements is capable of focusing upon the detector-array section corresponding thereto. Each focusing element and the detector-array section corresponding thereto defines an associated optical path. Disposed within each optical path is an optical filtering element such that electromagnetic energy that passes through that filtering element impinges upon the detector-array section optically correlated with that filtering element. Each filtering element is configured to transmit, at a filter-specific maximum intensity, the central wavelength at a temperature disparate from the temperature at which each of the other filtering elements is configured to transmit the central wavelength. The transmittance as a function of temperature for each filtering element at least partially overlaps the transmittance as a function of temperature of at least one other filtering element among the plurality of filtering elements, thereby extending the operative temperature range of the detector assembly.

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