Abstract
A novel pyroelectric detector, based on a bilayer laminate of pyroelectric thin films, is described. A theoretical analysis shows that this detector element, which is called a pyroelectric bimorph, has the potential of having a higher sensitivity than an equivalent single-element detector. Verification of this result was found by characterizing three bimorph detectors based on polyvinylidene fluoride (PVDF). The specific detectivity for one particular bimorph was measured to be 6.6×108 cm Hz1/2/W, at a modulation frequency of 1 Hz, approximately twice the reported value for a single-element pyroelectric polymer film. We discuss operating characteristics for the three pyroelectric bimorph elements and evaluate their use in optical power monitoring.
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