公开(公告)号：US3928843A

公开(公告)日：1975-12-23

申请号：US48278374

申请日：1974-06-24

Applicant: OPTICAL COATING LABORATORY INC

Inventor： SPROUT JAMES COLE ,  BERMAN HERBERT L

IPC: H01H47/24 ,  G01J5/20 ,  G08B13/18 ,  G08B13/19

CPC classification number: G01J5/20 ,  G08B13/19 ,  Y10S250/01

Abstract: An infrared intrusion alarm system utilizes two sensing elements and two signal processing channels arranged such that an intruder produces signals of opposite polarities in the two channels. An alarm signal is delivered only in the event that the two signals of opposite polarities are present simultaneously. Disturbances, such as component noise, which affect only one channel cannot give rise to an alarm, nor can power supply disturbances which produce signals of the same polarity in both channels.

Abstract translation: 红外入侵报警系统利用两个感测元件和两个信号处理通道，这两个信号处理通道被布置成使得入侵者在两个通道中产生相反极性的信号。 只有在相反极性的两个信号同时存在的情况下才报告信号。 仅影响一个通道的干扰，例如元件噪声，不会引起报警，也不会在两个通道中产生相同极性信号的电源干扰。