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1. 发明授权

EP0464049B1 ELECTRICAL QUENCHING CIRCUIT 失效
标题翻译：电气火灾CIRCUIT
公开(公告)号：EP0464049B1
公开(公告)日：1996-02-28
申请号：EP90904403.4
申请日：1990-03-16
申请人： KIDDE FIRE PROTECTION LIMITED
发明人： HARLEY, Phillip, Edward
IPC分类号： H03K17/74 , H03K17/78 , H03K17/94 , G01J1/44
CPC分类号： H03K17/941 , G01J1/44 , H03K17/74
摘要： An electrical quenching circuit for detecting, and quenching, avalanches in an avalanching device (5), comprises a TTL comparator (14) having one of its inputs (24) fed with a predetermined potential via a potential divider (18, 20) and a voltage reference (22). When a switchable current source (6) is in its low impedance state, and when the device (5) is quiescent, diodes (10) and (16) conduct and input (12) is held at the potential of the voltage reference (22). Comparator (14) is in one stable state. Variations in the voltage reference affect both comparator inputs substantially equally. When the device (5) avalanches, the current from source (6) is diverted through the device and the diodes (10) and (16) cease to conduct. The potential at comparator input (12) falls and, at a critical value, switches the comparator to its other stable state. This is indicated by a pulse on line (34). The output on line (28) switches current source (6) into its high impedance state and quenches the avalanche in the device (5). A time-delayed output to diode (32) raises the potential at comparator input (12) so as to switch the comparator back to its initial state.

2. 发明授权

EP0464048B1 PARTICULATE DETECTING AND OPTICAL COUPLING ARRANGEMENTS 失效
标题翻译：设备对于粒子检测和光学式离合器。
公开(公告)号：EP0464048B1
公开(公告)日：1995-08-16
申请号：EP90904402.6
申请日：1990-03-16
申请人： KIDDE FIRE PROTECTION LIMITED
发明人： HARLEY, Phillip, Edward
IPC分类号： G01N21/47
CPC分类号： G01N21/8507 , G01J2001/4466 , G01J2005/062 , G01N21/51 , G01N21/53 , G01N2015/0238 , G01N2201/0813
摘要： Apparatus for detecting particulates (46) within a medium in a chamber (10) comprises a photo-detector (14) which is maintained at a stable low temperature by a Peltier type cooling device (42). Scattered light from the particulate (46) is focussed by a spherical lens (34) onto the input face (30) of a rod lens (22). The latter has an optical pitch of 0.5 and transfers the image to its output face (25) whence it passes via a light pipe (18) to the sensitive area (16) of the photo-electric device (14). The rod lens (22) provides an inexpensive means for transferring the light and which provides a thermal barrier. Thus, although the photo-electric device (14) is held at a low temperature, the input face (30) of the rod lens (22) can be held at the temperature of the medium within the chamber (10) and is not subjected to the formation of mist or ice. The lens (34) is mounted by means of a collar (28) which is slidable into a position in which the lens (34) focusses the input light onto the face (30) of the lens (22), and then secured in this position by ultra-violet-cured adhesive fillets (32, 34).

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