How to Strengthen Motion Detection Alarm Infrared Detection
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For intrusion detection systems or burglar alarms, it is a product used to detect illegal intrusions. As we all know, the current commercial office buildings, retail stores must be equipped with basic intrusion detection products; but in fact, the real demand for the field is still in the financial and military industries. Today, intrusion detection is an important part of an integrated security system, and it also performs excellently with video surveillance, fire alarms, and access control.
Many different technologies and methods are currently used in motion detection schemes. For any intrusion alarm, how to avoid false alarms and increase the sensitivity of the detection device is indeed a headache. This problem may be solved by temperature sensing or passive infrared detection.
PIR is a passive infrared detection technology. The PIR sensor does not send any data information. It performs intelligent determination by receiving changes in infrared radiation. Passive infrared has temperature requirements on the target object, and the temperature of the detected object is higher than absolute zero. At this time, the device can receive the infrared energy it emits.
The PIR sensor consists of a Fresnel lens, a pyroelectric sensor element, and a signal processing unit. The Fresnel lens focuses the infrared energy element on pyroelectricity, and then converts the change in infrared energy into an electrical signal, which is then analyzed by a signal processing unit.
PIR sensors have custom boundaries and the detector can be divided into vertical and horizontal modules. When the detector senses that the infrared energy of the adjacent light beam crossing the boundary is twice the original value, the warning message is issued at this time. The signal processing unit uses an algorithm to decipher the thermoelectric elements and calculates the frequency and time between each pulse signal by studying the waveform (or signal strength) produced by its amplitude. Through such a fine algorithm to determine whether the object is moving or pet-induced false alarms.
Infrared detector is correctly installed <br> <br> dual technology sensor before installing one infrared sensor, the device is in place to ensure that the flow of people can walk through and meet the high alarm through the target, and pay attention to avoid blind detection range.
Because PIR motion sensors are sensitive to infrared energy testing, it is possible that everybody misreading it as a non-human invasion can be avoided. In fact, false alarms caused by animals often exist. Especially small rodents trigger inadvertent alarms. The size of the animal's volume also has a different rate of false positives, so infrared sensors must also support dual-technology capabilities.
Infrared sensors often combine with other motion sensing technologies as an integrated technology to eliminate each other's weaknesses. This type of motion sensing is often referred to as a dual technology motion sensor. This technique is divided into "and", "or", and the two technologies will only alarm if they are in the "and" relationship. In the "or" mode, there will be no alarm, which reduces the false alarm rate. Of course, to increase the sensitivity of the equipment alarm will not appear missing.
For intrusion infrared sensors, I wonder if you have a good solution? For the false positives and false negatives of products, infrared sensing and temperature detection have their advantages and disadvantages. Whether dual technology can reduce underreporting needs verification of truth in practice.