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Analysis of infrared detector technology

Date: 2018-10-19 14:10:52 Traffic: 3842 Source: Original

I. Wireless Detectors <br /> Unique wireless dual-monitoring technology US security technology FOCUS wireless detector is a combination of infrared and microwave detection methods, which is commonly known as dual-monitoring technology. The microwave detection method of the dual-spectrum detector is based on the Doppler principle of physics. The microwave is transmitted at one frequency. When there is a moving object within its coverage, it will be reflected at another frequency. There is a frequency difference in the reflection frequency. According to the size of the detection change, the volume and moving speed of the person can be known, combined with the signals detected by the infrared, the internal CPU chip performs arithmetic processing on the two trigger signals, comprehensively analyzes the relevant characteristics of the signals, and finally determines whether the viewing area has invaded. By.

When two detectors are launched at the same time when the microwave is launched at the same time, the transmission time of the microwave will be different, thereby canceling the same-frequency interference and completely changing the phenomenon that two dual detectors cannot be installed in a room. FOCUS infrared microwave dual detector can be installed in the same space of four.

The two-way wireless communication system defaults to set the communication between the detector and the alarm host every 0-4 hours, which can grasp the operating procedures and working status of the host in real time. In addition, the system determines the front-end detector status and the undervoltage of the wireless detector through the communication status. Reports, lost reports, etc.

Random dynamic time division processing of at least two pyroelectric human infrared sensors to detect weak infrared signals in the detection area, randomly sampling the infrared signal of each second with a period of at least two seconds, and corresponding to the infrared signal of this period The digital signal is stored in RAM, and the frequency of infrared radiation of the object every second in a cycle is obtained; the frequency data of infrared radiation of the object every second in a cycle in RAM is compared with the infrared characteristic frequency of the human body stored in ROM. If the detected frequency range is 6-12Hz, it is judged as a pet activity and the alarm is abandoned; if the detected frequency range is 0-5Hz, an alarm is issued.

The energy accumulation logic processes at least two pyroelectric human infrared sensors with a high and a low setting to detect weak infrared signals, and stores the digital signal corresponding to the infrared signal every second in RAM; judging that within every second in RAM Whether each digital signal is the same, if it is different, it is judged as a pet activity, and the alarm is abandoned. If it is the same, the digital signal data stored in the RAM is added and the result of the addition operation is determined to be in ROM. Within the range of the corresponding infrared characteristic data of the human body, if it is, the alarm is issued, if not, the alarm is abandoned.

Ultra-low-power design uses micro-power technology. The FOCUS wireless dual infrared probe has a static current of 9uA, an alarm of 10uA, and a dual-view infrared probe with microwave operating current of 20uA, and an alarm of 15mA. If two high-performance batteries are used, the service life can reach 36 months, and the dual-monitor can reach more than 18 months. In the case of weak electricity, it can also work for three months, saving users money.

The solar battery is powered by a built-in rechargeable lithium battery, and the power supply part is powered by 12V / 3W solar panels. There is no need to lay power lines and signal lines. The power supply capacity of the solar panel is much greater than the power consumption of the detector, ensuring no light at night and continuous rainy days. Works as usual.

2. Wired detectors <br /> The energy accumulation logic processes at least two pyroelectric human infrared sensors with a high and low setting to detect weak infrared signals, and stores the digital signals corresponding to the infrared signals every second in RAM. ; Determine whether each digital signal in RAM is the same for each second; if they are different, judge it as a pet activity and give up the alarm; if they are the same, add the digital signal data stored in RAM and judge Whether the result of the addition operation falls within the corresponding range of the infrared characteristic data of the human body in the ROM; if it is, the alarm is issued; if not, the alarm is abandoned.

When the anti-camouflage function detector is set to the anti-camouflage mode, the CPU digitally analyzes the very weak infrared signal. If it is analyzed that the signal is caused by an intruder blocking the body with a UV-protective umbrella or other objects, the CPU will start immediately. Microwave detection performs digital logic analysis on the signals generated by the intruder's movement. If the signals generated by the intruder are analyzed, an alarm is issued. Conversely, if the false alarm signal is generated by a tree swing or other object, the alarm will not be issued.

Random dynamic time division processing of at least two pyroelectric human infrared sensors to detect weak infrared signals in the detection area, randomly sampling the infrared signal of each second with a period of at least two seconds, and corresponding to the infrared signal of this period The digital signal is stored in RAM, and the frequency of infrared radiation of the object every second in a cycle is obtained; the frequency data of infrared radiation of the object every second in a cycle in RAM is compared with the infrared characteristic frequency of the human body stored in ROM. If the detected frequency range is 6-12Hz, it is judged as a pet activity and the alarm is abandoned; if the detected frequency range is 0-5Hz, an alarm is issued.

Automatic temperature compensation When the temperature changes, the center of gravity of the positive and negative charges in the crystal structure of the infrared sensor is relatively shifted, and the spontaneous polarization changes. However, the sensitivity of the sensor will also change with the change of the ambient temperature. The temperature compensation technology is derived from the thermal sensor detecting the ambient temperature and sent to the CPU microprocessor and the infrared signal is used as the normal signal to enhance the sensitivity of the detector, which is reliable. Sex is higher.
The detector uses voltage drift with temperature to enhance the detection capability of the detector. The temperature compensation technology analyzes the received signal amplitude, phase and frequency through the built-in CPU microprocessor. Adjustable microwave range, low current and microwave monitoring make FOCUS detectors more reliable. The anti-pet function design only responds quickly to invading humans, but does not give false alarms to pets under 45 kg.

The four-source infrared reverse polarity detection probe has two built-in infrared sensors.The moving signal will cause the two sensors to generate two signals with opposite polarities; instead of the moving signal (radio frequency, electromagnetic, spark, static electricity, etc.), the Both sensors produce two signals with the same polarity. With this principle, mobile and non-mobile signals can be accurately distinguished. The anti-interference ability obtained by applying this technology is incomparable with the traditional filtering and shielding technology; it has excellent anti-small animal ability.

Automatic pulse number adjustment
All Focus probes have this advanced feature. "Automatic pulse number adjustment" can detect the amount of energy of each infrared signal, and then store the data in the memory. The probe can automatically change the working mode according to the energy level in the memory: When the energy level is high (the probability of false alarms is low at this time), the low pulse number mode is used, and the function is the same as the general non-pulse number adjustment probe. When the energy level is low (the probability of false positives is high), using the high pulse number mode (up to 25 pulses) can effectively prevent false positives. Effectively prevent false positives without reducing sensitivity.

The fulcrum reflecting two microwave channels can distinguish forward moving targets from backward moving targets, and subtract their Doppler pulses to measure the net moving distance. The target's net movement distance in swing is very limited, so it can be immediately excluded from the intrusion event.

Shenzhen Meian Technology Co., Ltd.

Shenzhen Meian Technology Co. Ltd.
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National Phone: 400-8824-888
Landline: 0755-84844181
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