Passive Infrared Detectors Because Of False Positive And Solution
A passive infrared detector principle In nature, any more than the absolute temperature (-273 degrees) objects will have infrared spectra, vigilance in the passive infrared region, when the non-moving objects, pyroelectric infrared sensor is sensitive to the background temperature, When the moving object into the alert zone, through the Fresnel lens, pyroelectric infrared sensor senses the temperature of moving objects and background temperature differences, changes in the infrared signals into electrical signals to be issued after Alarm Signal. It does not have a passive infrared detector infrared emission.
Two false alarms caused by equipment failure
1, damage of failure. Including the performance of all the failure and sudden failure. Components of such failure is usually caused by damage or poor production technology (such as Weld, false welding, etc.) cause.
2, drift failure. Refers to the parameters and components Power supply Voltage drift caused by too much trouble. For example: high temperature resistance to change will lead to resistance, then equipment is too good and bad performance.
III Environment False alarms caused by the change
1, equipment installation does not always move aroused strong False Alarm;
2, air conditioning and ventilation fans against false alarms caused by temperature changes;
3, Prevention Regional door or window is not closed, it was caused by false alarms or animals after;
4, large difference in temperature, the wind curtains cause false alarms;
5, multiple detectors simultaneously transmit signals, can result in omission or interference (refers only to wireless type);
6, alarm system code errors caused by other wireless infrared detector false alarms. Performance when the equipment is too good and bad (only refer to the wireless type).
IV solution 1, according to the installation instructions require the installation of infrared detectors;
2, to avoid temperature and air flow is the region;
3, doors and windows closed to prevent the region, pay attention to the normal opening detector;
4, the doors and windows closed or tied curtains;
5, reducing the region to prevent cross-detection range, to avoid the simultaneous firing warning signal;
6, of the code, quickly and accurately and avoid the recorded information.
5, low false alarm protection 1, “0” false positives Product Misleading. To think that no one with PIR sensor as the detection of products, there are no absolute “0” false positive products, only by constant Technology Optimized to reduce the frequency and number of false positives. The reason is only a particular environment infrared detectors and detector microprocessor according to specific conditions within the pre-set a good program to discriminate. Detection sensitivity is affected by changes in the environment and conditions change, the change control environment is the key to reduce false positives.
2, CCC Certification . CCC compulsory certification of qualified products is necessary, but also use high-quality electronic components, strict quality system maintenance, credible commitment to quality and perfect after-sales service.
3, multi-detector technology portfolio to improve the reliability of identification, the current products are: passive infrared detectors, microwave + passive infrared Shuangjian detectors, voice + broken glass Shuangjian vibration detectors, passive infrared dual ultrasonic + Kam detectors.
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