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Detectors in the security industry

Mar 23, 2017

As the alarm information collection device, the importance of the detector in the anti-theft alarm system is self-evident, whether its performance is stable or not directly related to the entire burglar alarm system. In many of the detection technology, in addition to the traditional infrared, microwave, vibration, ultrasonic and other detectors, the perimeter protection class of electronic fence, vibration cable, vibration fiber also appeared. In addition, in order to meet the practical needs of users, many manufacturers make great efforts in new detector product forms, which is behaved in fulfilling the special needs in different environment. To create a variety of product form at the same time, the detector technology is also improving. In the course of many years of research and development, overcoming false positives, omission, interference and other issues has been the main theme of burglar alarm industry. In this regard, R & D personnel choose multi-beam, multi-probe element, micro-processing digital processing technology to enhance its sensitivity and detection accuracy. According to Bosch product manager Wang Yu introduced, as the window function is set to extend the scope of the detector, the detector has a certain range of detection limitations, first of all, the area below the detector is a blind spot, although the previous products has been related to the next window function before, but the user is still think that the next window is too small, by strengthening the next window function, you can achieve greater expansion of the next window detection range, so as to enhance the detector detection and accuracy.

Nowadays, pets are also family members, such as cats, dogs, birds and other animals. When the pet are (even children) entering the test area, they often trigger the detector and cause false alarm, so the excellent anti-pet detector has become the focus of the company's research and development. In fact, anti-pet technology has appeared for a long time, but the effect has long been unsatisfactory, especially now pets have been very popular, so in order to avoid pet false positives, anti-pet detection technology research and development is also continuous. Such as the use of self-developed MASK chip, with "random dynamic time segmentation processing" technology, the signal processing for each second of the infrared signal random sampling, and the cycle of the infrared signal into the corresponding digital signal And then the frequency of the infrared radiation of the object in one cycle is obtained; and then the frequency data of the infrared radiation of the object in one cycle is compared with the infrared characteristic frequency of the human body stored in the ROM. If the detected frequency range is 6-12Hz, then it will judge its  the pet activity, and give up alarm, if the detection frequency range of 0-5Hz, then it will judge thats  invaders, and then alarm.