The cost of intelligent identification of human-sensing radar modules is comparable to that of infrared PIR. With the advent of the global wave of intelligence and the era of carbon neutrality, human-sensing has been widely used in smart lighting, smart home, smart home appliances, smart security and various IoT scenarios.
Radar technology and PIR are the core technology solutions of intelligent sensing. What are the technical characteristics and differences? Follow us to learn more about it~
Radar comes from English RADAR (Radiodetectionandranging) that is "radio detection and ranging". It is a method of irradiating the target by emitting electromagnetic waves and receiving its echoes to obtain the distance, distance change rate (radial velocity), azimuth, Equipment with information such as altitude.
PIR Pyroelectric Infrared Sensor: PIR (PassiveInfra-Rey)
Composition: It is mainly composed of shell (Fresnel lens) + pyroelectric probe (filter + pyroelectric element PZT + field effect tube FET) + signal amplification processing unit.
How it works: At 37°C, the human body emits about 10μm of infrared light, which is enhanced by the Fresnel filter and concentrated on the infrared sensor source. The infrared sensor source usually uses a pyroelectric element. When the temperature of the infrared radiation of the human body changes, the charge balance will be lost, and the charge will be released outward. The subsequent circuit will generate an alarm signal after detection and processing. The purpose of this probe is to detect human radiation. Therefore, the pyroelectric element must be very sensitive to infrared radiation with a wavelength of 10 μm. In order to be only sensitive to infrared radiation, its radiating surface is usually covered with special Fresnel filters to significantly control environmental disturbances.
Fresnel mirrors come in two forms: refractive and reflective. One of its functions is to filter and focus, refract the pyroelectric infrared signal (reflection) PIR second, divide the detection area into several light and dark areas, so that the moving object entering the detection area enters the detection area PIR in the form of temperature change to generate a changing pyroelectric infrared signal. , so as to generate a pyroelectric infrared signal PIR which can generate a changing electrical signal. A passive infrared probe whose sensor contains two heat-releasing cells connected in series or in parallel. The polarization directions of the two electrodes are just opposite, and the environmental background radiation has almost the same effect on the two heat release elements, so that the release effects cancel each other out, so the detector has no signal output. Once people invade the detection area and move laterally, the infrared radiation of the human body is focused by some mirrors and received by the heat release cells. However, the heat received by the two heat release cells is different, and the heat release power is different and cannot be offset. Signal processing alarms; Doing radial motion, its detection ability will be much weaker.
Infrared functions and use conditions are very limited, ugly appearance, vulnerable to temperature, airflow, heat source interference, low sensitivity, short service life and other defects; radar sensors have all-weather, small size, high sensitivity, good consistency, stable performance, easy to use, etc. The advantage is that it can provide more comprehensive target information (distance, speed, direction) than infrared, and realize functions such as micro-motion and life presence detection, and intelligent applications are more scalable.
The innovative human-sensing radar module 5.8GHz Soc radar core greatly reduces the chip cost, module peripheral circuit cost, production and testing cost of the radar while maintaining its excellent radar performance. In this way, the overall cost performance can be PK PIR pyroelectric infrared. Due to the high degree of module integration, the size is greatly reduced (as small as 14mm*14mm), which can meet the needs of various structural sizes and greatly promote the development process of intelligent sensing products.
With the rapid development of the Internet of Things, the human body sensor radar module sensor has also exploded as the bottom layer and core of the Internet of Things, and more and more industries and products are using sensors to complete intelligent upgrades. With the continuous optimization and upgrading of civilian radar technology, the functions, performance, stability and anti-jamming characteristics of radar sensing technology solutions will be better reflected. As the world's most advanced IoT sensor expert, with the support of a strong team and strong funds, Space Technology will focus on high-performance radio frequency, microwave/millimeter wave radar sensing technology and low-power MCU technology and module technology, assisting objects Smart upgrades in networking, smart home, smart lighting, smart security and other industries.
