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公开(公告)号：EP2162675A1
公开(公告)日：2010-03-17
申请号：EP08761016.8
申请日：2008-06-13
发明人： GRIMM, Max , WÄLTI, Hansjürg , MÜLLER, Kurt , PEDROSA, Antonio
CPC分类号： G08B5/38
摘要： The invention relates to a flashlight for alarm systems, comprising a light source (L) containing at least one light emitting diode (1) and a circuit which controls said light source, said circuit comprising a feed supply (2), a current converter (W) and flash control device (B). Said current converter (W), the light source (L) and flash control device (B) are connected in series. The current converter (W) comprises a control unit (4), an inductor (6), an induction stop (7) and a resistor (8) which are connected in series. The flash control device (B) comprises at least one switch (10) for actuating the light source (L) and a microprocessor (9) for controlling the at least one switch (10).
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公开(公告)号：EP1407248B1
公开(公告)日：2010-05-12
申请号：EP02737710.0
申请日：2002-06-17
IPC分类号： G06T7/20 , G08B13/194 , G08B17/12 , G08B29/14
CPC分类号： G08B13/19602 , G01N21/532 , G06T7/20 , G08B17/125
摘要： The invention relates to a video smoke detection system that comprises a camera (1) for recording video images and a signal processing stage (2) in which the brightness of the individual pixels or groups of pixels of the video images is determined. The inventive method is characterized by obtaining a value representative of the brightness of the pixels and examining said value in its temporal progression for changes that are characteristic of the occurrence of smoke. For an examination of the system for the purpose of a performance check or calibration, the signal of the camera (1) can be influenced in such a manner that a change of the video signal characteristic of the occurrence of smoke is simulated to the signal processing stage (2), namely by means of the element reducing the contrast of the video signal.
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