Pyroelectric/CCD Hybrid Focal Plane

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Abstract
A pyroelectric detector/Si CCD hybrid focal plane operates at room temperature, and may prove useful in applications where the sensor performance requirement is moderate but low cost is essential. Flip-chip, bump mounted LiTa03/CCD modules are under development at Honeywell (see Figure 1). A one dimensional thermal model of the pyroelectric detector response has been developed. The detector element is modeled as a continuous one dimensional thermal transmission line, consisting of three thermally conductive layers corresponding to the pyroelectric, bump and Si CCD substrate, with the far surface of the substrate layer affixed to an ideal heat sink. The thermal conduction equations were solved exactly within the layers, and from the solutions obtained for the appropriate boundary conditions, the thermal and voltage responsivities were derived as functions of frequency. The responsivities exhibit flat response at low frequencies and a 1/s roll off at high frequencies. The flat portion is dependent only on the thermal conductances of the three layers, while the 1/s portion is dependent only on the heat capacity of the pyroelectric layer. The analysis has been applied to the real pyroelectric devices.

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