20 years of microwave sensor detection, working principle and application of radar sensor manufacturers

20 years of microwave sensor detection, working principle and application of radar sensor manufacturers, radar sensor manufacturer ISEE has been developing microwave products for 20 years, the technology is becoming more and more mature, the scope of use is becoming wider and wider, and the user base is also growing. The following is the basic principle of microwave sensor and microwave continuous wave detection that ISEE will explain to you.

1. Microwave Basics

Microwave has the characteristics of straight line propagation, easy reflection, poor radiation ability, good transmission performance, not easy to be interfered by other electromagnetic waves, less affected by smoke, flame, dust, temperature, etc., and wide frequency band.

Microwave sensors use the properties of microwaves to measure target motion. distance. speed. direction. Whether the sensor exists. The basic principle is that electromagnetic waves radiate the antenna into free space. When the electromagnetic wave in free space encounters a moving object, the surface of the moving object will scatter, and some electromagnetic energy will be reflected to the receiving antenna of the detector through the surface of the moving object. After the antenna receives the reflected microwave signal, the electromagnetic parameter of the reflected wave is detected by the signal processing line to realize the microwave detection function.

2. Microwave sensor working mode of radar sensor manufacturers

Microwave sensors mainly have two working modes: CW (continuous wave) and FMCW (frequency modulated continuous wave). Continuous wave (CW) can detect the movement and speed of the target. FMCW (Frequency Modulated Continuous Wave) detects movement, speed, distance and presence of targets.

3. Working principle of microwave continuous wave sensor

The microwave continuous wave sensor of radar sensor manufacturer uses the principle of Doppler effect to detect moving targets. The microwave sensor uses the sinusoidal vibration signal generated by the microstrip oscillator to transmit the antenna and radiate into free space. When electromagnetic waves in free space encounter a moving object, the surface of the moving object scatters. Some of the electromagnetic energy reaches the detector's receiving antenna through reflections from the surface of moving objects. The electromagnetic wave reflected according to the principle of Doppler effect produces Doppler frequency shift. The frequency depends on the speed of the moving object. The reflected frequency-shifted signal and the vibration signal generated by the local dielectric oscillator pass through the detector's frequency mixer to generate an intermediate frequency signal. The IF signal is amplified by the active filter of the processing board and transmitted to a single disk.

The higher the working frequency of the microwave sensor, the narrower the gain and detection beam, the longer the detection distance, the stronger the anti-interference, the better the reflectivity, the smaller the antenna, the higher the signal-to-noise ratio, which can reduce the false triggering of the microwave sensor and improve the stability. sex.

What are the common applications of microwave sensors of radar sensor manufacturers? Microwave sensor products have been widely used in many scenarios such as industry, medical industry and home. Today we are going to talk about microwave sensors. Microwave sensor is a device that uses microwave characteristics to detect some physical quantities. Including the presence of sensing objects, movement speed, distance, angle and other information.

Microwaves emitted by a transmitting antenna can be absorbed or reflected when they are absorbed or reflected, changing their power. Use the receiving antenna to receive the measured object or the microwave reflected by the measured object, convert it into an electrical signal, and then process it in the measurement circuit to realize microwave detection. Microwave sensors are mainly composed of microwave oscillators and microwave antennas. Microwave oscillators are components that generate microwaves. Components of microwave oscillators include speed regulators, magnetic controls, and some solid-state components. The vibration signal generated by the microwave oscillator is transmitted through the waveguide and through the antenna. In order to align the direction of the emitted microwaves, the antenna must have a special structure and shape.

Common applications of microwave sensors:

1. Microwave switch

The principle of the microwave switch bit system is to supply power to the oscillator. The oscillator generates the microwave signal, which is transmitted through the antenna. The position of the test object affects the microwave signal received by the microwave from the antenna. After amplification and comparison, the signal responds to the positional information of the test object.

2. Microwave level gauge:

The principle of the microwave water level gauge is that when the water level reaches a specific position, the microwave signal emitted by the transmitting antenna is reflected to the receiving antenna through the water level, and the output signal reflects that the current water level is D. When the water level is greater or less than D, the receiving antenna cannot receive the reflected microwave signal, which is completely different from the signal that processes the light of the photoelectric switch sensor.

The emergence of microwave sensors has enriched people's lives and brought about changes. Radar sensor manufacturer ISEE, as an advanced R&D leader in the microwave sensor industry, has been striving to develop more complete functions and more powerful sensor products.