Living Presence Sensor Radar Sensing Smart Lighting

Application of Living Body Presence Sensor Radar Sensing LED Lamp Intelligent Lighting,Radar (RADAR) is a radio detection and distance measurement. Radar is mainly composed of transmitter, transmitting antenna, receiver, receiving antenna, signal processor and display (external). The electromagnetic energy generated by the radar transmitter is transmitted to the transmitting antenna. Transmitting antennas radiate this electromagnetic energy into the atmosphere, forming radar electromagnetic waves that travel forward. When the radar wave encounters an object during driving, it will bounce and be acquired by the radar receiving antenna, forming the radar echo signal.

According to the principle of the Doppler effect, the frequency and amplitude of the bounced radar waves vary with the movement of the objects encountered. If the object encountered by the radar wave is stationary, the frequency of the bounced wave does not change. When the target is close to the radar antenna, the frequency of the reflected signal will be higher than that of the transmitter; conversely, when the target is farther away from the antenna, the frequency of the reflected signal will be lower than that of the transmitter. In this way, by changing the frequency value and processing by the signal processor, the relative movement speed of the target and the radar is calculated, and then the position of the target and the shape of the movement track are identified.

In many cases, we will be using devices that need to detect human motion, so people's first instinct is to use human body infrared sensors or photoelectric switches. Now we use live presence sensor radar sensing which is very easy to use and cheap. The principle is to detect the microwave generated by the movement of the object, which can perform indiscriminate detection of the movement of people, animals or objects. The point is that it is very sensitive, has a large detection range, presents sector detection, and can detect front and rear.

The operating frequency of the radar of the living body presence sensor is generally fixed at 5.8GHz, plus or minus 75MHz. The specific process is as follows.

(1) Start-up - After the sensor is powered on, the oscillator circuit in the sensor will automatically generate a frequency of 5.8GHz, plus or minus 75MHz, which we call the local oscillator frequency.

(2) Amplify the local vibration frequency as an electromagnetic wave carrier, and emit electromagnetic waves into the air through a high-frequency tube (or antenna).

(3) After the electromagnetic wave received and transmitted is reflected by surrounding objects, it is selected by the frequency selection network of the oscillator. Compared with the original 5.8G frequency, the difference signal is used as the basic signal for self-test (surrounding environment detection).

(4) When a moving object appears around, the reflected electromagnetic wave is analyzed by the circuit, which is different from the basic signal during self-checking. At this time, the signal is used as the basis of the trigger signal, and the sensor outputs the control signal.

LEDs are called fourth-generation lighting sources or green light sources. The LED light-emitting device is a cold light source, which has the advantages of energy saving, environmental protection, long life, small size and strong controllability. With the rapid development and mutual penetration of computer technology, automatic control technology, bus technology, signal detection technology and microelectronic technology, lighting control technology has been greatly developed. The LED light source is small in size, quick to start, adjusts light and shade, and switches frequently, but does not affect the performance, which is in line with the direction of intelligent lighting control. Combining the two, the living presence sensor radar sensing LED intelligent lighting came into being.

Radar microwave sensor devices are transmitted by electromagnetic waves. Using the Doppler effect principle and Fourier transform technology, the precise high-frequency phase and frequency difference analysis system can accurately detect the high sensitivity of moving objects, whether it is a person or a vehicle, as long as the motion can be detected by the sensing device. Living body presence sensor radar sensing technology is one of the most advanced technologies for smart LED daylight products. It can effectively reduce lighting power consumption, reduce energy waste, and achieve the purpose of energy saving and emission reduction.

The radar induction ceiling light integrates the LED light source board and the intelligent induction sensor, which is used to replace the traditional light source and intelligent induction device of various corridor ceiling lamps. The magnet is attached on the back, and there are no screw fixing parts, so it is easy to install, and it can cooperate with the intelligent control circuit of the radar induction drive power supply to meet the needs of energy-saving renovation of various corridor lighting.

The radar sensing of the living presence sensor uses the Doppler principle. Microwave induction lamps emit high-frequency electromagnetic waves (5.8GHz) and receive their echoes. This microwave induction lamp detects changes within the echo and detects small movements within the range. Signals can pass through thin wooden doors, glass panels and thin walls.

Compared with traditional lamps, it can save energy by 85% and is intelligent and energy-saving. Microwave induction is more energy efficient Living Presence Sensor Radar induction does not require dismantling the entire set of ceiling lights, nor does it require separate wiring. It can be used after the wiring is powered on, saving labor and electricity costs, without construction noise, and without disturbing the owner, killing three birds with one stone.