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Probes that use light-blocking methods, when someone crosses a surveillance zone, interrupt an invisible infrared beam and cause an alarm. Commonly used for outdoor wall alarms, it is always used in pairs: one for transmission and one for reception. The transmitter emits one or more infrared light that cannot be seen by the human eye to form a cordon. When an object passes through, the light is blocked, the receiver signal changes, and the alarm is amplified after processing. Infrared on the radio probe to choose the appropriate response time: too short and easy to cause unnecessary interference, such as small birds flying over, small animals through, etc.; too long will miss the report. The shortest shading time is usually determined at a speed of 10 meters per second. If the person's width is 20 centimeters, the shortest interruption time is 20 milliseconds. More than 20 milliseconds alarm, less than 20 milliseconds no alarm.
Dual-beam alarms are widely used in urban security, community, factories, companies, schools, homes, villas, warehouses, resources, petroleum, chemicals, gas transmission and distribution and many other fields. Beam interrupter sensor <br> <br> main advantage of the dual beam infrared radio:
1, using infrared light beam, the human visual is not visible, with a covert way of prevention, so that intruders can not escape to trigger the alarm.
2, multi-beam infrared curtain wall products, there is no blind spot and dead ends.
3, complete defense performance, regardless of the intruder with a fast jump, crouching or other actions, trying to pass the infrared beam to prevent the area, will trigger the alarm.
4, good anti-jamming performance, only at the same time block all infrared beam, will trigger the alarm. When there are insects, deciduous or small animals, etc., when passing through an infrared light beam, since the entire infrared light beam cannot be interrupted at the same time, false alarms are not generated.
5, all-day work mode.
National Standard GB10408.4 - 2000 active infrared intrusion detectors 4.1.7 Detection distance b) Outdoor Use: The maximum beam distance of the active infrared intrusion detector should be more than 6 times the detection distance specified by the manufacturer.
According to the national standard, the detector can resist the attenuation of rain, fog, helium, strong water vapor, strong sunlight to the beam, and resist bad wind (especially lateral high wind) blowing to cause the deviation of the beam and other bad weather and meteorological conditions. .
Infrared shot full name is called "beam intercept type sensor" (PhotoelectricBeamDetector), its basic structure including the aiming hole, beam intensity indicator, spherical lens, LED indicator and so on. The detection principle is that infrared light is used to transmit the diodes through the LED infrared light, and then the focusing process is performed through the optical mirror so that the light is transmitted to a long distance and is received by the light receiver. When the light is interrupted, an alarm is issued. Infrared is an invisible light, and it spreads, and it projects to form a cone beam. Infrared light emits 1000 beams without a second, so it is a pulsed infrared beam. As a result, these shots cannot be transmitted over a long distance (within 600 meters).