Infrared intrusion detector with pyroelectric sensor and charge amplifier

摘要: An infrared intrusion detector, utilizing as a sensor element pyroelectric detector element, accomplishes evaluation of the output signal with charge amplifier, for instance by means capacitive feedback coupled operational which is reset at certain time intervals. The circuit operates independently capacitance and therefore enables optimum utilization pyroelectrical properties. By virtue short-circuit operation low ohmic properties there obtained particularly good non-sensitivity against external disturbances noise increased sensitivity.