发明名称 |
Miniature photoelectric sensing chamber |
摘要 |
A low profile, low volume smoke chamber displaces a light source, such as a light emitting diode or laser diode, and a sensor, such as photodiode or phototransistor, to the exterior of the sensing volume. A symmetrical sensing volume results which can be coupled to symmetrical input/output ports via a generally U-shaped flow path. A two part sensing chamber housing is formed with a lower cylindrical base portion and an upper cylindrical cover portion which slideably engage one another. At least the upper cylindrical portion carries a plurality of grooves for suppression of reflections and collection of dust. An exterior end of the upper portion carries a plurality of spaced apart openings which can be filled with a screen. A reduced sensing volume in combination with a selected screen size produces an acceptable signal to noise ratio and response rate while still excluding insects and other non-smoke related particulate matter. <IMAGE> |
申请公布号 |
EP1049060(B1) |
申请公布日期 |
2004.06.09 |
申请号 |
EP20000303627 |
申请日期 |
2000.04.28 |
申请人 |
PITTWAY CORPORATION |
发明人 |
SHOAFF, THOMAS W.;WATSON, KALVIN;PETROVIC, DRAGAN;SCHOENFELDER, GEORGE A.;CONFORTI, FREDERICK J.;WIEMEYER, JAMES F. |
分类号 |
G08B17/107 |
主分类号 |
G08B17/107 |
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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