发明名称 |
FIRE ALARM BOX |
摘要 |
The invention relates to a fire alarm call box for detecting gaseous and powdery combustion products, comprising at least one optical transmitter and at least two optical receivers, each for sending an electrical signal to an evaluation unit connected downstream. At least one of said optical receivers (28) is located beyond a direct range of radiation (8) of the optical transmitter (2) and acts as a scattered light receiver. At least one other optical receiver (4) is located within the direct range of radiation (8) of the optical transmitter (2). A gas sensitive layer (18) is connected upstream of this optical receiver (4). Upon contact with a specific gas, said layer preferably absorbs light components of a certain narrow wavelength range. |
申请公布号 |
WO9945515(A1) |
申请公布日期 |
1999.09.10 |
申请号 |
WO1998DE02750 |
申请日期 |
1998.09.17 |
申请人 |
ROBERT BOSCH GMBH;PFEFFERSEDER, ANTON;HENSEL, ANDREAS |
发明人 |
PFEFFERSEDER, ANTON;HENSEL, ANDREAS |
分类号 |
G01N21/75;G01N21/27;G01N21/49;G01N21/53;G08B17/103;G08B17/107 |
主分类号 |
G01N21/75 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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