Microwave detectors use the Doppler effect of microwaves to detect moving objects: it is an active detection technique that uses the Doppler effect associated with the change of the frequency of the reflected wave and the speed of the target object to detect the motion of the object. It has been widely used in military radar and medical ultrasound.

Energy conservation, emission reduction, safety protection, and automotive electronics are the topics of greatest interest to investors, manufacturers, and consumers. Applying Doppler microwave probes as human motion detection in these areas will bring more convenience to consumers and Affordable, the fashionista who has done energy saving and emission reduction has saved the cost and enjoyed the convenience and reassurance brought by high-tech products.

The popularity of household appliances greatly facilitates people's lives and consumes a large amount of energy. How to improve the efficiency of electrical appliances and reduce energy consumption is a major concern of various home appliance manufacturers, and a large amount of research and development funds have been invested to improve the energy consumption of products. On the other hand, due to people's negligence, the energy waste caused by not turning off the power when no one is there is quite astonishing. If the office air conditioner forgets to close, the long-term work of water-consumption, electric fans and other power-consuming products when they are not only wastes a lot of Energy also left hidden dangers such as fires and other major accidents. According to statistics, due to household appliances standby and no-time work, energy wastage, accounting for 10-20% of energy consumption.

When General Secretary Hu Jintao went to visit Zhuhai Gree in December 2009 to celebrate the return of Macao, he talked about his visit to Africa. The air conditioning proposed by his African friends was too quiet and caused the civil servants to forget to turn off the air conditioning after work. If we The installation of Doppler motion sensors on air conditioners, televisions, and other appliances will solve this problem if no one turns off the power within a certain period of time. Now there are air conditioning manufacturers and TV manufacturers using microwave Doppler. Le sensors do application work for smart appliances.

Remind people of the current energy consumption situation, people develop the habit of saving electricity and people's pursuit of life comfort and convenience sometimes conflict, in order to resolve this conflict, the Swedish scientists last year invented the transparent wire is to let people see the wire color The changes to remind people of the size of power consumption, this invention was named last year's Top 50 Inventions of the Year by the American Times Magazine.

Doppler microwave sensor as energy-saving power board and the current market, the computer energy-saving power supply has significant advantages, the market's computer energy-saving power supply is the use of detection of the size of the current passed, in the standby power consumption of the appliance is low, according to In this way, the power supply is cut off, which only solves the power consumption when the appliance is in standby, and cannot solve the huge waste caused by inadvertently turning off the appliances and the risk of potential accidents, and it cannot automatically turn on the power and bring the user to use when there is someone. Inconvenience. The microwave sensor power supply solves this problem well without affecting people's usage habits.

Doppler microwave sensors have been widely used in the security market, and their active detection technology has avoided the disadvantages of poor weatherability and blind zone distance of infrared sensors. Since the output signals of microwave sensors contain more speed than infrared, strength and other information are convenient. Developers do more processing on the software to improve the alarm's anti-jamming and anti-miss reporting capabilities. Make detectors that invade the outdoor perimeter and prevent balconies and windows from invading.

Existing manufacturers have applied Doppler microwave sensors to automobile security. They actively detect the opening movement of the windows and doors of automobiles, avoiding the common faults of existing alarms and causing people to misreport common faults, and are free from the impact of ordinary wireless jammers. , Its active detection in the car when parking. It also avoids the risk of asphyxiation caused by people's negligence on children and pets left in the car.

Doppler microwave sensor is used in the car. Actively detecting the movement of the doors and windows during parking avoids the hidden troubles caused by the change of the original car circuit in the ordinary car alarm system in the aftermarket. It requires no professional installation and independent installation. Its low power consumption (3 mA) has almost no effect on the original vehicle battery, thus avoiding the current market alarm (usually with a power consumption of 100 mA on a gsm/gps). The problem of fire.

The current civilian Doppler microwave sensor works mainly in the c-band (5.8 GHz) x-band (10.525/10.687 GHz) and k-band (24.125 GHz), and its transmit power is less than 10 mW, which is specified by the ITU. Apply for frequency band ism. The detection pattern has omnidirectional and directional, ranging from 0.1-50 meters depending on the antenna gain and transmit power.

With the gradual decline in the price of Doppler microwave sensors, it will wait for wider use in home appliances, lighting and automotive electronics.