Intrusion detection system
    1.
    发明授权
    Intrusion detection system 失效
    入侵检测系统

    公开(公告)号:US5021766A

    公开(公告)日:1991-06-04

    申请号:US372317

    申请日:1989-06-28

    IPC分类号: G08B13/20

    CPC分类号: G08B13/20

    摘要: A pressure sensitive perimeter intrusion detector comprises at least two pressure sensitive housing members adapted for the transmission of acoustic waves in response to pressure applied to the exterior of the housing members. Each housing member is capable of providing a first electric signal in response to seismic waves or ground vibrations. In addition, distributed along the housing members are pressure-sensing elements for detecting pressure applied along the housing members. These pressure-sensing elements for each housing member provide a second electric signal having substantially no time delay. The first and second electric signals are transmitted to an evaluation circuit adapted to produce an alarm signal in response to the detection of an intrusion occurrence.

    摘要翻译: 压敏周边入侵检测器包括至少两个压力敏感的壳体构件,其适于响应于施加到壳体构件的外部的压力而传播声波。 每个壳体构件能够响应于地震波或地面振动而提供第一电信号。 此外,沿着壳体部件分布的是用于检测沿着壳体构件施加的压力的压力感测元件。 用于每个壳体构件的这些压力感测元件提供基本上没有时间延迟的第二电信号。 第一和第二电信号被发送到适于响应于入侵发生的检测而产生报警信号的评估电路。

    Testing apparatus for intrusion detectors
    2.
    发明授权
    Testing apparatus for intrusion detectors 失效
    入侵检测仪测试装置

    公开(公告)号:US4743886A

    公开(公告)日:1988-05-10

    申请号:US783222

    申请日:1985-09-23

    摘要: The monitoring of intrusion detectors is effected by an apparatus for testing the responsiveness to environment-caused, detector-specific useful and spurious signals. This testing apparatus is arranged inside of the intrusion detector and ensures that during installation and during the operation of the intrusion detector its electrical parameters are optimally adjusted. Deviations of these parameters from their nominal values and the location of these deviations are indicated.

    摘要翻译: PCT No.PCT / EP85 / 00035 Sec。 371日期:1985年9月23日 102(e)1985年9月23日PCT 1985年2月7日PCT PCT。 出版物WO85 / 03589 1985年8月15日。入侵检测器的监控由用于测试对环境引起的检测器特定有用和杂散信号的响应的装置来实现。 该测试装置布置在入侵检测器的内部,并确保在入侵检测器的安装和操作期间,其电参数被最佳地调整。 这些参数与其标称值的偏差和这些偏差的位置被指示。

    Method of, and circuit arrangement for, function control of ultrasonic
alarm installations
    3.
    发明授权
    Method of, and circuit arrangement for, function control of ultrasonic alarm installations 失效
    超声波报警装置的功能控制方法及电路装置

    公开(公告)号:US4727522A

    公开(公告)日:1988-02-23

    申请号:US783230

    申请日:1985-09-23

    CPC分类号: G08B29/14 G01S7/52004

    摘要: In an ultrasonic alarm installation ultrasonic waves are continuously emitted into a monitored region and a frequency shift due to a moving object, e.g. an intruder, by virtue of the Doppler effect is evaluated for giving an alarm signal. The function control in this installation occurs during a test phase by means of brief aperiodic modulation of the emitted ultrasonic waves. The resulting brief frequency broadening generates in the same evaluating circuit a signal if the installation is functioning correctly. The time duration of the aperiodic modulation is selected to be so short that no standing waves can form, so that the function control can also work faultlessly if the installation, because of vectorial addition of the received ultrasonic waves, accidentally is in an insensitive state. Thus even coverings of the ultrasonic transmitter during a sabotage attempt can be recognized and distinguished from an insensitive state.

    摘要翻译: PCT No.PCT / EP85 / 00036 Sec。 371日期:1985年9月23日 102(e)1985年9月23日PCT 1985年2月7日PCT PCT。 公开号WO85 / 03590 日期为1985年8月15日。在超声波报警装置中,超声波被连续地发射到被监视的区域中,并且由于移动物体,例如, 通过多普勒效应评估入侵者给出报警信号。 这种安装中的功能控制通过对发射的超声波进行短暂的非周期性调制而在测试阶段发生。 如果安装正常工作,则产生的短暂的频率展宽在相同的评估电路中产生信号。 选择非周期性调制的持续时间非常短,从而不会形成驻波,使得由于接收到的超声波的向量加法意外地处于不敏感状态,所以功能控制也可以无故障地工作。 因此,在破坏尝试期间甚至可以识别超声波发射器的覆盖物并将其与不敏感状态区分开来。

    Method of, and circuit arrangement for, function control of ultrasonic
alarm installations
    4.
    发明授权
    Method of, and circuit arrangement for, function control of ultrasonic alarm installations 失效
    超声波报警装置的功能控制方法及电路装置

    公开(公告)号:US4729120A

    公开(公告)日:1988-03-01

    申请号:US782716

    申请日:1985-09-23

    CPC分类号: G01S7/52004 G08B29/14

    摘要: In an ultrasonic alarm installation, ultrasonic waves are continuously emitted into a monitored region and a frequency shift caused by a moving object, e.g. an intruder, is received by an ultrasonic receiver and evaluated by virtue of the Doppler effect for generating an alarm signal. For testing the ultrasonic alarm installation the emitted ultrasonic waves are modulated by a plurality of modulation frequencies in the range of the frequency shifts effective for triggering the alarm signal. Thus, the function test can be carried out using the same electrical evaluation circuit as for generating the alarm signal. The plurality of modulation frequencies conjointly with the switch-off of the transmitter signal has the effect that the reflected signals, which arrive at the ultrasonic receiver with different phase relationships, are not vectorially added to the ultrasonic transmitter signal to yield zero, so that a reliable function control is always ensured. Furthermore and for determining changes in the monitored region, the time decay of the modulation-caused signal is compared with a reference signal in the electrical evaluation circuit after switch-off of the modulation signal.

    摘要翻译: PCT No.PCT / EP85 / 00037 Sec。 371日期:1985年9月23日 102(e)1985年9月23日PCT 1985年2月7日PCT PCT。 第WO85 / 03591号公报 日期为1985年8月15日。在超声波报警装置中,超声波被连续地发射到被监视的区域中,并且由移动物体(例如, 入侵者由超声波接收器接收,并且通过用于产生报警信号的多普勒效应进行评估。 为了测试超声波报警装置,发射的超声波由频率范围内的多个调制频率进行调制,有效触发报警信号。 因此,可以使用与产生报警信号相同的电气评估电路来执行功能测试。 与发射机信号的关断结合的多个调制频率具有这样的效果:到达具有不同相位关系的超声波接收机的反射信号不被向量地添加到超声发射机信号以产生零,使得 始终保证可靠的功能控制。 此外,为了确定监视区域的变化,将调制信号的时间衰减与关断调制信号之后的电气评估电路中的参考信号进行比较。

    Infrared intrusion detector with pyroelectric sensor and charge amplifier
    5.
    发明授权
    Infrared intrusion detector with pyroelectric sensor and charge amplifier 失效
    具有热释电传感器和电荷放大器的红外入侵检测器

    公开(公告)号:US4418335A

    公开(公告)日:1983-11-29

    申请号:US303630

    申请日:1981-09-18

    申请人: Rudolf Genahr

    发明人: Rudolf Genahr

    IPC分类号: G08B13/18 G08B13/191

    摘要: An infrared intrusion detector, utilizing as a sensor element a pyroelectric detector element, accomplishes evaluation of the output signal of the detector element with a charge amplifier, for instance by means of a capacitive feedback coupled operational amplifier, the output signal of which is reset at certain time intervals. The evaluation circuit operates independently of the detector capacitance and therefore enables optimum utilization of the pyroelectrical properties. By virtue of the short-circuit operation and the low ohmic properties of the circuit there is obtained a particularly good non-sensitivity against external disturbances and low noise and increased sensitivity.

    摘要翻译: 红外线入侵检测器利用热电检测器元件作为传感器元件,利用电荷放大器来实现对检测器元件的输出信号的评估,例如通过电容反馈耦合的运算放大器,其输出信号被复位在 一定的时间间隔。 评估电路独立于检测器电容工作,因此能够最佳地利用热电特性。 由于电路的短路操作和低欧姆特性,可以获得对外部干扰和低噪声以及增加灵敏度的特别好的非灵敏度。