The principle of radar microwave induction switch sensor and the problems that should be paid attention to when installing and using microwave sensor

The principle of radar microwave induction switch sensor and the problems that should be paid attention to when installing and using microwave sensor, radar microwave induction switch sensor uses the Doppler effect of microwave radar to detect moving objects. After years of extension and development, the technology has been widely used in the fields of military radar and medical ultrasound. It is worth mentioning that the radar microwave induction switch sensor is an active detection technology.

Energy saving and emission reduction, safety protection, and automotive electronics are currently the topics of interest to investors, manufacturers and consumers. Doppler microwave probes are used to detect moving objects in these fields, which will bring more convenience to consumers. and benefits, which can save energy and reduce emissions, reduce costs, and enjoy the convenience and comfort of high-tech products.

Airport and hotel automatic doors are the familiar application of radar microwave sensor switch sensors. With the decline in the price of microwave sensors, they are more and more widely used in automatic sensor lights, because microwave sensors are more weather-resistant than infrared sensors. Affected by temperature and dust, the sensing distance is farther. The radar microwave sensor switch sensor is used in public places such as warehouses, corridors, and high-end communities such as villas, and gradually replaces the application of infrared sensors, gaining more customers' choices.

The radar microwave induction switch sensor is a non-contact detector with a certain anti-radio frequency interference ability. It is not easily affected by temperature, humidity, light, air flow and dust. , it is convenient to control various products or equipment. The radar microwave induction switch sensor not only has the characteristics of electromagnetic waves, but also has certain differences from ordinary wireless waves.

Compared with electromagnetic waves with longer wavelengths, microwaves have the following characteristics:

1. The directional radiation device is easy to manufacture;

2. It is easy to reflect when encountering obstacles;

3. Poor diffraction ability;

4. The transmission performance is good, and the transmission process is less affected by smoke, fire, dust, strong light, etc.

5. The absorption of microwaves by the medium is proportional to the dielectric constant of the medium, and water has a strong ability to absorb microwaves.

The microwave of the radar microwave induction switch sensor transmitting antenna will be absorbed or reflected when it encounters the measured object, thus changing the power. Microwave detection can receive the measured object or the microwave reflected by the measured object through the receiving antenna, convert it into an electrical signal, and then process it through the measuring circuit.

The radar microwave induction switch sensor is mainly composed of a microwave oscillator and a microwave antenna. A microwave oscillator is a device that generates microwave signals. The microwave oscillator is composed of solid components such as gallium arsenide field effect transistor and silicon carbon triode. The oscillating signal generated by the microwave oscillator is transmitted by the microwave transmission line and the antenna. In order to make the directional microwave emission uniform, a directional antenna is specially designed.

Generally speaking, microwave sensors on the market have low emission power and general detection range, so they cannot be used conveniently and normally. The radar microwave induction switch sensor product is equipped with a patented microwave antenna, which solves these problems well, so as to better enjoy the smart life.

What should be paid attention to when installing and using radar microwave inductive switch sensor

Compared with infrared sensors, microwave sensors have unparalleled advantages in detection accuracy, adaptability to the environment, penetration and longevity. Therefore, the application of microwave sensors is becoming more and more common. In addition to lighting, it is also widely used in system control, Internet of Things and other fields. However, when users install and use radar microwave inductive switch sensors, they have many questions due to their unfamiliarity with the characteristics of microwave sensors.

Let's talk about the precautions for installing and using microwave sensors:

1. Professional personnel are required to assist in the installation

Microwave sensor is a professional product. Due to wiring, DIP switch settings and other reasons, professional personnel are required to assist in the installation.

2. Metal materials cannot penetrate

The microwave sensor can penetrate non-metallic materials such as plastic, glass, wood, gypsum board, etc., and can be installed inside the lamp without affecting the overall design and installation of the lamp, which is the advantage of the microwave sensor. But at the same time, microwaves can also penetrate drywall. For non-concrete walls such as glass walls, there is a mobile signal outside the wall, which will also trigger the microwave sensor to work, causing trouble for some users. In the case of a standard concrete wall, the energy of the microwave radiation will be dissipated at the wall, rather than penetrating. Microwaves cannot penetrate metal, but we often see customers installing microwave sensors behind the aluminum substrate of the light panel. In this way, the sensor does not work.

3. The sensing distance is related to a variety of factors

For product specifications provided to customers, there will be an inductive radiation map showing the detection distance of the sensor in 8 directions. We will pay attention to the test conditions: 1.65m person moving at a speed of 0.3m/s. In fact, in addition to the size of the detected object, the factors that affect the sensing distance also include the speed of movement. Installation height and installation environment (whether there are multiple reflective surfaces), such as the sensing distance in the corridor environment is farther than the open environment; adults will be farther than the sensing distance tested by children, etc.

4. Debug according to the application environment

Due to the diversity of application environments for radar microwave inductive switch sensors, manufacturers cannot simulate each application environment for verification and testing. Therefore, when installing microwave sensors in different occasions, it may be necessary to re-adjust the parameters (such as sensing distance, constant light, low light time, light sensing threshold, etc.) to make the sensor match the environment. For example, in a small space or a large area of metal environment, we need to set the low induction mode or reduce the induction distance to make the product work stably.

The radar microwave induction switch sensor usually adjusts the parameters in two ways, one is the remote control, the other is the dial switch, the effect is the same, but there are more parameter choices on the remote control. In addition, customers can notify the application environment in advance, and we can set specific parameters according to customer requirements. For the new installation environment, it is recommended that customers try to install 5pcs before batch installation, set appropriate parameters, the product works stably, and then install in batches.

5. Set the correct light sensitivity value

The combination of motion sensors and light control could make sensors smarter and more energy efficient. Due to different times, different weathers, different seasons and different environments, the proportions of various spectrums in natural light are different, resulting in different illumination values for photosensitive detection. To solve this problem, it is recommended to install the sensor in the environment to avoid direct sunlight.

In addition, affected by the light transmittance of the lampshade, the natural light will decrease after passing through the lampshade, resulting in the actual value received by the photoreceptor being different from the light outside the lampshade, and the light transmittance of different lampshades is also different. Therefore, the user also needs to adjust the light control value in the installation environment. In different installation environments, customers can choose different light control values to match.

6. Dimming function, need to adapt to the dimming drive

For the dimming function sensor, it is necessary to adapt to the dimming drive. Since the dimming curve and dimming precision of each driver are different, the sensor is suitable for different types of drivers, and the dimming effect will be slightly different. For example, some brightness can be adjusted to 10%, and some can only be adjusted to 20%, which is determined by the driver.

7. Outdoor apps may be falsely triggered

The principle of radar microwave induction switch sensor is to detect moving objects. There are moving signals such as fans, DC motors, sewers, air outlets, and vibrations around the sensor. Sensors may be triggered.