发明授权
- 专利标题: Method and apparatus for detecting smoke in an ion chamber
- 专利标题(中): 用于在离子室中检测烟雾的方法和装置
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申请号: US13667165申请日: 2012-11-02
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公开(公告)号: US09207209B2公开(公告)日: 2015-12-08
- 发明人: Benjamin T. Cooke , Joseph Julicher , Keith Edwin Curtis
- 申请人: Microchip Technology Incorporated
- 申请人地址: US AZ Chandler
- 专利权人: MICROCHIP TECHNOLOGY INCORPORATED
- 当前专利权人: MICROCHIP TECHNOLOGY INCORPORATED
- 当前专利权人地址: US AZ Chandler
- 代理机构: Slayden Grubert Beard PLLC
- 主分类号: G01N27/66
- IPC分类号: G01N27/66 ; G08B17/11 ; H03M3/00 ; G08B29/18
摘要:
A smoke detection sensor ion chamber has a leakage current that is dependent upon the permittivity of the ionized gas (air) in the chamber. Smoke from typical fires is mainly composed of unburned carbon that has diffused in the surrounding air and rises with the heat of the fire. The permittivity of the carbon particles is about 10 to 15 times the permittivity of clean air. The addition of the carbon particles into the air in the ion chamber changes the permittivity thereof that is large enough to detect by measuring a change in the leakage current of the ion chamber.
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