초록 ▼

An intrusion detector is configured to transmit signal(s) of a very short duration and then process the returned signal(s) reflected from various surfaces and objects within the propagation path in a room to be secured. The return signal(s) is a succession of peaks whose return times represent the l

An intrusion detector is configured to transmit signal(s) of a very short duration and then process the returned signal(s) reflected from various surfaces and objects within the propagation path in a room to be secured. The return signal(s) is a succession of peaks whose return times represent the location of respective objects. As configured, the intrusion detector apparatus includes, inter alia, a microprocessor that stores processed facsimiles of the return signal(s) for an unoccupied room and continually makes comparisons with subsequent returned signal(s). When the returned signal(s) changes, as a result of an unauthorized entry into the room, for example, a visual and/or audible alarm indication is produced.

대표청구항 ▼

An intrusion detector apparatus for detecting an unauthorized entry in a room to be secured, comprising: means for transmitting for a predetermined period transmitted signal(s), said means for transmitting being configured to repeat transmitting of the transmitted signal(s) at a predetermined interv

An intrusion detector apparatus for detecting an unauthorized entry in a room to be secured, comprising: means for transmitting for a predetermined period transmitted signal(s), said means for transmitting being configured to repeat transmitting of the transmitted signal(s) at a predetermined interval(s) following the predetermined period; and means for receiving received or return signal(s) during the predetermined interval in response to the transmitted signal(s) being reflecting from the walls, floor, ceiling or objects in the room to be secured, if present, said means for receiving including a microprocessor and being cofigured to detect, process and store a facsimile of the received signal(s) for the room to be secured when unoccupied, and then to continually compare facsimiles of subsequent received signal(s) therewith, according to a predetermined algorithm, so as to give a visual and/or audible indication of an unauthorized entry into the room to be secured, the predetermined algorithm operating to cause said microprocessor to indicate an alarm when there are two or more errors and/or unauthorized entry occurrences as determined by comparison between the stored facsimile and the current facsimile during at least three consecutive ones of the predetermined interval(s).