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公开(公告)号：EP1194908A4
公开(公告)日：2004-10-13
申请号：EP00914824
申请日：2000-03-03
申请人： BRK BRANDS INC
IPC分类号： G08B17/107 , G08B17/10
CPC分类号： G08B17/107 , G08B17/113
摘要： A photoelectric smoke detector incorporates a short wavelength radiant energy emitter (14). The emitter, an LED or laser diode, emits frequencies in a range of 430 to 450 nanometers. The emitted frequencies can be further shortened by directing them to impinge on a non-linear crystalline material (22). Radiant energy emitted from the material will have a wavelength on the order of sixty percent that of incident radiant energy (14'). The short wavelength energy will be scattered by airborn particulate matter characteristic of relatively fast, flaming fires. The emitter, an LED or laser diode can include an 880 or 940 nm wavelength coupled with shorter wavelength ranges (190-450 nm) with associated detection. It also has the capability of detecting slow burning smoldering-type fires. A control circuit and an audible output device provide a local audible alarm of a detected fire.
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公开(公告)号：EP1004106A4
公开(公告)日：2004-09-08
申请号：EP98940789
申请日：1998-08-05
申请人： BRK BRANDS INC
CPC分类号： G08B29/183 , G01N33/004 , G08B17/10 , G08B21/14 , G08B21/16 , G08B29/145 , Y02A50/243
摘要： A smoke sensor and a carbon monoxide sensor are integrated into a common detector housing. The smoke sensor is coupled to a smoke detector control integrated circuit which generates a binary output signal indicative of the presence of smoke. This signal is coupled to a programmed microprocessor in the detector housing. The carbon monoxide sensor is also coupled to the microprocessor. Outputs from the two sensors are processed substantially independently. In the presence of smoke, the smoke alarm is generated by the microprocessor. In the presence of sufficient levels of carbon monoxide, in the absence of smoke, a carbon monoxide alarm will be generated.
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