Pyroelectric detector with feedback amplifier for enhanced...

G - Physics – 01 – J

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Details

G01J 5/14 (2006.01) G01J 5/10 (2006.01) G01J 5/24 (2006.01) G01J 5/30 (2006.01) G01J 5/34 (2006.01)

Patent

CA 2252547

A pyroelectric detector circuit comprises a pyroelectric sensor element connected to a load resistor and to an input of a buffer amplifier having a feedback path for multiplying the resistance of the load resistor at non-zero frequencies. This feedback enables the use of a smaller load resistor which is multiplied to produce a higher effective load resistance necessary for proper low frequency response of the detector circuit.

L'invention concerne un circuit pyroélectrique (10) qui comprend un élément de détection pyroélectrique (14) relié à une résistance de charge (RL) et à une entrée (G) d'un amplificateur séparateur (16) présentant un trajet de réaction (C) permettant de multiplier la résistance de la résistance de charge à des fréquences différentes de zéro. Cette réaction permet l'utilisation d'une résistance de charge plus petite qui est multipliée pour produire une résistance de charge efficace plus élevée nécessaire pour la réaction basse fréquence du circuit de détection.

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