Radar Sensing Liveness Presence Sensor Human Respiration Detection

Radar Sensing Living Presence Sensor Human Respiration Detection Realizes the Principle of Presence Sensing,Radar is an electronic device that uses electromagnetic waves to detect targets. By emitting electromagnetic waves to illuminate the target and receiving its echoes, it can obtain information such as distance, distance change rate (radial velocity), direction, and angle. So how does the living presence sensor radar sensing work? Simply put, it is an RC impulse circuit composed of capacitance between the copper foils of the PCB outside the collector, the internal resistance of the triode, and the capacitance (the back of the high-frequency triode PCB must be shielded by copper to shield the interference), and the impulse circuit has high impact. The frequency signal is amplified by the triode and then transmitted through the antenna around the PCB.

We can add photosensitive elements in the back-end driving circuit to detect day and night light as a premise to control the output at night, so as to realize the driving demand during the day and night. The principle of radar sensing is the principle of the Doppler effect (there is such an interesting phenomenon in life: when an ambulance is approaching, it hears a louder sound than when the car leaves. You may not realize it This phenomenon is the Doppler effect). The living presence sensor radar has a long sensing distance, a large angle and high sensitivity. It has the characteristics of penetrating non-metallic substances and is not affected by the environment, temperature, dust, etc.

With the advent of the 5g era, the continuous development of artificial intelligence and the Internet of Things, human-computer interaction and the intelligent upgrade of the Internet of Things have ushered in an explosion. The microwave radar human sensor is located in the perception layer of the Internet of Things, which undoubtedly plays an indispensable role in the realization of the intelligent scene of the Internet of Things.

With the help of radar sensors, people can detect the movement of objects and detect human respiration, so as to realize functions such as human energy lighting, smart home, smart home appliances, and smart security. But in some special application scenarios, in addition to human motion sensing, people often have higher requirements.

1. In the hall, lying on the sofa quietly, do you need to turn off the lights?

2. Can you accurately determine whether you are at home or away from home, so as to automatically adjust the smart device scene settings?

3. In the office, only the micro-action of tapping the keyboard, can the induction lamp beside it continue to be turned on?

4. For hotel rooms, can you accurately judge whether the room is to leave the room or rest, so as to decide whether to turn off the air conditioner to save energy?

In order to meet the above-mentioned market demands, ISEE has launched a living body presence sensor radar sensing solution. Human breath detection can detect human presence!

When it comes to human body sensors, the first thing that many friends think of should be the pyroelectric induction module, which is also the most common human body induction based on infrared detection. It is widely used in sensor lights, welcome devices, intrusion alarms and other products and designs, including safety reminders at the entrance and exit of escalators.

However, the application of pyroelectricity is so common that it still has some disadvantages. For example, it works on people or animals that emit infrared light. If you don't believe it, try it. Tested using pyroelectricity. Stand in front of you without moving and see if it can see you.

In addition, on products that use pyroelectricity, a small white hemisphere will be found on the housing, that is, its lens cover. Even with traditional pyroelectric sensors, it is difficult to make a hidden sensing head.

Living body presence sensor radar sensing has a long sensing distance, wide angle, no dead zone, can penetrate glass, thin plates, etc., and can even penetrate walls of different thicknesses according to the power. At the same time, the radar living body presence sensor is working normally. Environment, not affected by environment, temperature, dust, etc. These advantages are unmatched by pyroelectric induction.

ISEE living presence sensor This series works in the 24 GHz ±75 MHz frequency band, integrates high-performance 32MCU, single-chip directly outputs induction control signals, and is a real SOC. It has strong performance, rich algorithms and strong scalability, and is suitable for scenarios with high performance requirements. It supports standard UART interface, which can be connected with other master controllers or sensors, and can also be used as a master controller to realize presence sensing based on human breath detection.