公开(公告)号：EP0995179A4

公开(公告)日：2002-02-06

申请号：EP98935573

申请日：1998-07-13

申请人： LASER GUARD LTD

发明人： FRUCHT YAACOV

IPC分类号： G08B13/181 ,  G01S15/04 ,  G01S17/02 ,  G01V8/12 ,  G08B13/196 ,  G08B15/00

CPC分类号： G08B13/19695 ,  G01S17/023 ,  G01S17/026 ,  G08B13/19608 ,  G08B13/1963

摘要： A light beam, preferably from a laser (68), is reflected from a target, which is a potential intruder. The time period for the beam to return to a light detector and the intensity of the reflected light is recorded (72). A computer analyses the measurements of distance and intensity. Intruders are detected based on changes in these measurements from those made during a 'learning' period. Targets are tracked using data collected in consecutive searches of the protected area. An alarm is sounded and/or a video camera is actuated. An acoustic sensor system (53) may be included, which is able to detect intruders with sound. A sensor fusion unit (74) can determine whether propagation conditions are adequate for the operation of the laser system (70), or alternatively whether the acoustic sensor system (52) should be used instead.

公开(公告)号：EP0995179A1

公开(公告)日：2000-04-26

申请号：EP98935573.0

申请日：1998-07-13

申请人： Laser Guard Ltd.

发明人： FRUCHT, Yaacov

IPC分类号： G08B13/181

CPC分类号： G08B13/19695 ,  G01S17/023 ,  G01S17/026 ,  G08B13/19608 ,  G08B13/1963

摘要： A light beam, preferably from a laser (68), is reflected from a target, which is a potential intruder. The time period for the beam to return to a light detector and the intensity of the reflected light is recorded (72). A computer analyses the measurements of distance and intensity. Intruders are detected based on changes in these measurements from those made during a 'learning' period. Targets are tracked using data collected in consecutive searches of the protected area. An alarm is sounded and/or a video camera is actuated. An acoustic sensor system (53) may be included, which is able to detect intruders with sound. A sensor fusion unit (74) can determine whether propagation conditions are adequate for the operation of the laser system (70), or alternatively whether the acoustic sensor system (52) should be used instead.