公开(公告)号：US4156816A

公开(公告)日：1979-05-29

申请号：US821742

申请日：1977-08-04

申请人： Erik G. Lindgren

发明人： Erik G. Lindgren

IPC分类号： G08B17/103 ,  G01N21/26

CPC分类号： G08B17/103

摘要： The invention relates to an optical fire-detector in which a radiation-emitting means is arranged to emit a beam of radiation and which has modulator means for the modulation of the beam of radiation in a phase-inverted relationship within a first and a second wavelength band, and a radiation-detecting means is arranged to receive the beam of radiation after it has passed through an intermediate air medium and includes first means for an individual measurement of intensity in the two wavelength bands and second means for the detection of such variations in the measured intensities which are representative for a fire.

摘要翻译： 本发明涉及一种光学火灾检测器，其中辐射发射装置被布置成发射辐射束，并且具有调制装置，用于在第一和第二波长内以相位倒相的关系调制辐射束 并且放射线检测装置被布置成在辐射束通过中间空气介质之后接收辐射束，并且包括用于单独测量两个波长带中的强度的第一装置和用于检测这些变化的第二装置 测量的火焰代表的强度。