摘要:
A portable, self-contained security system for protecting an object external to the system, the system comprising one or more sensors and one or more alarms to draw attention to the unit if the sensors are activated.
摘要:
A microwave detection system includes a transmitter configured to transmit a signal along a path to detect an intruder to a monitored zone and a modulating reflector configured to receive the transmitted signal to generate a modulated signal having a characteristic introduced by said modulating reflector, the modulating reflector being configured to transmit the modulated signal. The system also includes a receiver located to receive the modulated signal and an adaptive threshold adjustment unit configured for providing a variable detection threshold responsive to a change in a gain of the system. The system further includes a processor configured for processing the modulated signal provided by the receiver and configured for measuring a characteristic in the processed modulated signal with respect to the variable detection threshold provided by the adaptive threshold adjustment unit.
摘要:
The application describes a method for the detection of electrically conductive moving elements, which comprises the arrangement of measuring devices (3) located in a monitored space along a protected boundary or perimeter at equal or different distances from each other and connected to each other by a connecting cable (1), the measuring devices having the form of converters converting a magnetic field into an electric voltage, and emitters (4) connected to each other by another connecting cable (2) and having the form of converters converting electric voltage into a magnetic field, wherein changes of the parameters of the resulting field created by the emitters are detected by the measuring devices (3), and information on the detection of an electrically conductive object or a group of electrically conductive objects is worked out for given combinations of measured parameters. To enhance the reliability of the detection of one or several electrically conductive moving objects and to increase the accuracy of the localisation of the place or places where the protected boundary (perimeter) is crossed by the one or several electrically conductive objects, according to the invention the measuring devices (3) are equipped with apparatuses for primary analysis and processing of the measured changes in the parameters of the magnetic and electric fields, "measuring device/emitter pairs" are formed from neighbouring and adjacent measuring devices (3) and emitters (4), the "measuring device/emitter" pairs also identify information on the detection of an electrically conductive object worked out by each "measuring device/emitter" pair, said information is transmitted to the central information analysis and processing apparatus (14), which generates a warning of the detection of an electrically conductive object or a group of electrically conductive objects, indicating the place of the detection of the object or the places of the detection of the objects.
摘要:
One embodiment is provided with a microwave sensor (1) that sends a plurality of microwaves of different frequencies toward a detection area, then outputs a reflected wave detection signal (S1) indicating whether or not there is a detection target object in the detection area based on respective reflected waves, and outputs information (Vd) of a distance to the detection target object, a distance determination means (102) for determining whether or not the distance to the detection target object is a predetermined distance or greater based on the distance information (Vd), and an alarm signal output control means (104) for performing control such that an alarm signal (Dout1) is outputted only when the distance to the detection target object is the predetermined distance or greater and when the reflected wave detection signal (S1) is indicating a presence of a detection target object.
摘要:
A dual mode motion sensor for detecting both motion of a moving target and a range of the moving target. The dual mode motion sensor normally operates in a pulse transmission mode. If motion is detected, the sensor automatically switches to a frequency modulated continuous wave transmission mode. This will allow the sensor to determine the range of the moving target. The sensor includes a microcontroller that compares the determined range of the moving target with a predetermined maximum detection range. If the determined range is outside or exceeds the predetermined maximum detection range the sensor will ignore the motion. If the determined range is within the predetermined maximum detection range, an alarm will be generated.
摘要:
An intrusion detection system includes a microwave transceiver detecting motion in a protected space. The microwave transceiver generates a first signal. A first infrared sensor detects a source of infrared energy in a plurality of upper detection zones within the protected space. The first infrared sensor generates an upper sensor signal. A second infrared sensor detects a source of infrared energy in a plurality of lower detection zones positioned below the upper detection zones within the protected space and intersecting a floor surface within the protected space. The second infrared sensor generates a lower sensor signal. A processor receives the first signal, the upper sensor signal and the lower sensor signal. The processor generates an alarm signal in response to the first signal exceeding a threshold value. The threshold value is varied in response a relationship between the lower sensor signal and the upper sensor signal.
摘要:
Apparatus in one example comprises first and second fence posts that cooperate to represent a subportion of a perimeter to be secured. The first fence post comprises a first motion sensor and a first laser sensor. The second fence post comprises a second motion sensor and a second laser sensor. Upon physical movement in a region outside the subportion of the perimeter, one or more of the first and second motion sensors serve to automatically perform a detection of the physical movement in the region outside the subportion of the perimeter. Upon the detection of the physical movement in the region outside the subportion of the perimeter the one or more of the first and second motion sensors serve to automatically cause the first and second laser sensors to monitor for physical movement at the subportion of the perimeter.
摘要:
An intrusion detection system includes a microwave transceiver detecting motion in a protected space. The microwave transceiver generates a first signal. A first infrared sensor detects a source of infrared energy in a plurality of upper detection zones within the protected space. The first infrared sensor generates an upper sensor signal. A second infrared sensor detects a source of infrared energy in a plurality of lower detection zones positioned below the upper detection zones within the protected space and intersecting a floor surface within the protected space. The second infrared sensor generates a lower sensor signal. A processor receives the first signal, the upper sensor signal and the lower sensor signal. The processor generates an alarm signal in response to the first signal exceeding a threshold value. The threshold value is varied in response a relationship between the lower sensor signal and the upper sensor signal.
摘要:
An anti-intrusion detecting device (1), especially for doors and windows, to be applied on the outside of buildings, presenting a typically parallelepiped shape, where the larger side is placed horizontally over the opening (40) to be protected; the detector (1) incorporates two sensors (2,3) each of which functions in accordance with a different detection principle and each of which covers different volumes (44, 45) and areas (4, 5) of sensitivity.