After in - depth structure analysis, a passive infrared sensor ( PIR ) model was presented.

通过对系统的物理结构分析提出了一种被动式 红外传感器 模型.

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Ceiling detector, dual passive infrared + microwave.

吸顶双鉴探测器, 双元被动红外+微波.

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Infrared night - vision technology is divided into active and passive infrared night vision technology, infrared night - vision technology.

红外夜视技术分为主动红外夜视技术和被动红外夜视技术.

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