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公开(公告)号：EP0630510A4
公开(公告)日：1996-04-10
申请号：EP93905108
申请日：1993-03-08
申请人： COMMW OF AUSTRALIA
IPC分类号： G08B13/19 , G08B13/193 , G08B13/18 , G08B13/181 , G08B13/183 , G08B13/189
CPC分类号： G08B13/19 , G08B13/193 , Y10S250/01
摘要： An infrared intrusion sensor comprising an array of infrared detectors (17), infrared collection optics which may include a Cassegrain-style telescope (11, 12), a focal plane scanning device (11, 12, 13), including dither means adapted to repetitively scan the infrared radiation across the detector array, signal process means and local or remote display means. The sensor may incorporate heterodyne detection techniques with a local oscillator signal derived from the scanning frequency of the focal plane scanning device. The sensor has a low false alarm rate and enhanced detection range. Also disclosed is a method of processing signals involving A/D conversion, integration of the digital signals to produce a background signal, phase sensitive detection of the digital signal producing a target signal and comparison of the background and target signals producing a difference signal. This difference signal is then integrated to produce a background noise signal and processed to become a threshold signal which is finally compared to the difference signal to produce an alarm signal.
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公开(公告)号：EP0181891A4
公开(公告)日：1988-04-18
申请号：EP85902417
申请日：1985-05-17
申请人： COMMW OF AUSTRALIA
CPC分类号： G06K7/10653 , G02B17/0605 , G02B26/0825 , G02B26/10
摘要： A focal plane scanning device having a mirror pivoted to nod driven by at least one of a pair of piezoceramic drive elements (4-5) arranged generally parallel to the plane of the mirror (1) and extending in opposite directions past a first flexure member (3) which forms the pivot of the mirror (1), the other piezoceramic member being either oppositely driven or used as a control member.
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