barcode scanner java download FIGURE 7-2 Wall-mounted and ceiling-mounted ultrasonic detectors in Software

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FIGURE 7-2 Wall-mounted and ceiling-mounted ultrasonic detectors
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edy this shortcoming proper calibration is necessary to detect slow movement Another way a knowledgeable intruder can defeat the system is to use a special test light to detect the coverage patterns and then avoid these areas Figure 7-3 shows the active ultrasonic detector
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There are two types of infrared sensors, passive and active The passive infrared (PIR) sensors are divided into zones or sectors with each being defined with specific boundaries Passive infrared sensors detect electromagnetic radiated energy
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FIGURE 7-3 Active ultrasonic detector
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that is generated by sources that produce temperatures below that of visible light The sensors measure the change in thermal radiation Passive sensors do not emit any signal Instead the radiation of any movement in the room is checked against the environment of the room and changes that are hot images as contrasted between the hot image and the cooler background are detected as an intruder and an alarm is sent This occurs because the room is at a certain temperature, usually below what a human emits so the image appears as hot to the sensor The infrared energy is measured in microns and for humans the micron range is 7-14 with PIR sensors being focused on this narrow band Passive infrared, like the ultrasonic sensors, are mounted on the wall or ceiling and are used in conjunction with ultrasonic sensors, balance magnetic switches, glass break sensors, and time-delayed CCTV cameras
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Alarms (Intrusion Detection Systems)
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A condition that can cause nuisance alarms is the radiation produced by small animals and/or rodents Time-activated space heaters, ovens, and hot water pipes also will produce false alarms if they are in the field of view of the sensors Room temperatures that are between 80 to 100 degrees will make the sensors less effective Passive infrared sensors can be defeated by cloaking, masking, or shadowing the intruding heat source from the field of view and this will decrease the probability of detection (PD) since it reduces the possibility of sufficient radiant heat being focused on the thermal sensor Knowing the dead spots of the detection pattern can permit an intruder to bypass active regions Also walking into the sensor rather than across the sensor s field of view will also reduce the detection capability by not allowing the boundaries of the detection beams to be broken Figure 7-4 shows the number ranges and projection angles of the detection beams vary depending upon design Figure 7-5 is a ceiling-mounted PIR detector Figure 7-6 is a wall-mounted PIR with a curtain-detection pattern Figure 7-7 is a PIR wall mount showing the most sensitive area field of view Figure 7-8 shows PIR placement and coverage patterns Active infrared, on the other hand, generates a curtain pattern of modulated infrared energy The sensor then reacts to a change in the modulation of the frequency or an interruption in the received energy These occurrences happen when an intruder passes through the area being protected by the sensor Active infrared sensors have a transmitter and a receiver within a single unit The transmitter uses a laser to create the protection zone and the laser is projected onto a special retro-reflective tape that is used to define the protection zones outline The energy is reflected off the tape back to the receiver located in the same housing as the laser projector The energy is converted to an electrical signal and when the signal drops below a preset threshold for a specific period of time, an alarm is sent The coverage patterns are dependant upon the type of reflective tape used The range can be between 15-25 feet wide by 17-30 feet long The laser plane can be adjusted from 37 to 180 degrees The system has a high probability of detection (PD) of an intruder and the speed, direction, and the temperature of the intruder have no effect on the detection characteristics Some conditions can cause unreliable detection and nuisance alarms Dust or other particles that are deposited on the surface of the reflective tape will hinder the detection capabilities Gaps in the reflective tape will cause unreliable detection The tape must be continuous The angle from the sensor to the ends or corners of the tape must not exceed 45 degrees
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