| 摘要 |
PCT No. PCT/CH83/00111 Sec. 371 Date Apr. 16, 1984 Sec. 102(e) Date Apr. 16, 1984 PCT Filed Oct. 5, 1983 PCT Pub. No. WO84/01650 PCT Pub. Date Apr. 26, 1984.In a scattered radiation smoke detector (D) the energy supply from the evaluation unit (A) and the signal returned thereto take place exclusively optically by means of radiation conducting elements (L1, L2) and all electrical components are situated in the evaluation unit (A) remote from the smoke detector (D). An approximately parallel transmitting or reception zone of small diameter is generated by collimating devices (4, 6) disposed at the ends (3, 8) of the optical conductors and thereby the interference radiation level in the smoke detector is reduced and the sensitivity increased. Since the smoke detector (D) comprises no metallic components, it is insensitive to temperature and corrosion and is especially well suited for application in environments subject to the danger of explosion and electrical interference. |
