被动红外探测器(PIR)很早就应用于保安系统,并在10年前以良好的性能引起人们的关注。但是,当时的PIR价格昂贵、样子笨重,而且有些产品还有质量问题。今天的情形已经大大不同;PIR在保安产品市场上几乎已经象磁触点开关那样普遍,而且价格也大大降低。为了便于应用,PIR的形状和规格具有多种特色,本文具体介绍这些特色,以供有关制作厂家和用户参考。 Passive infrared detectors (PIRs) have long been used in security systems and attracted the attention of people with good performance 10 years ago. However, PIRs were expensive, bulky, and some had quality problems. The situation today is vastly different; PIRs are almost as common in the security product market as magnetic contact switches, and their prices are significantly lower. In order to facilitate the application, PIR shape and specifications with a variety of characteristics, this article describes these characteristics, for the production of manufacturers and users reference.