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本发明提供一种被动式红外探测器,它有一个热敏感器和一个聚焦装置。其聚焦装置由若干聚焦元件组成,每个聚焦元件又包括若干子元件,因此,监视区在垂直方向被分解成了高度略微有些不同的若干小区。在大多数监视区中,这种小区最多只有略微的重叠。
The present invention provides a passive infrared detector having a thermal sensor and a focusing device. The focusing device consists of a number of focusing elements each of which further comprises a number of sub-elements so that the monitoring zone is vertically divided into several cells of slightly different height. In most surveillance areas, such cells have only a slight overlap at best.