G - Physics – 01 – K
Patent
G - Physics
01
K
73/52, 340/155.2
G01K 7/34 (2006.01) G01J 5/34 (2006.01) G08B 13/191 (2006.01) H01L 37/02 (2006.01)
Patent
CA 1144776
PHB. 32,651 22 ABSTRACT: In a pyroelectric detector circuit arrangement in which a pair of capacitive detector elements (C1 and C2) formed of polarised pyroelectric material are electri- cally connected in series with the directions of polarisation of the elements being such that the normally produced signal voltages are in opposition, means are provided for inhibiting the depoling of the elements under conditions of cooling or excessive temperature cycling. A pair of ultra-low leakage diode elements (D1 and D2) in series opposition connection are arranged in parallel connection with the capacitive detector elements and connections are present between the common points in the diode series and the capacitive detec- tor element series. The diode elements are arranged with respect to the directions of polarisation of the detector elements so that for an increase in incident radiation on one or both detector elements the potential developed across the irradiated element or elements is in a sense such as to reverse bias the corresponding diode element connected in parallel therewith. In one embodiment the capacitive detec- tors (C1 and C2), the ultra-low leakage diode elements (D1 and D2), and FET amplifier means are present in a common envelope in the form of a hybrid microcircuit having only three external terminal connections.
349578
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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