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Home > FAQ

Common Problem

What is Millimeter-Wave Detection?

Millimeter-wave detection is a radar technology that can detect objects and provide information on their distance, speed, and angle. This contactless sensing technology operates in the frequency range of 24GHz to 300GHz. Due to its short wavelength, it offers millimeter-level ranging accuracy and can penetrate non-metallic materials like plastic, drywall, and clothing. It is also unaffected by environmental conditions such as rain, fog, dust, and snow.

Measurement Range and Accuracy of Millimeter-Wave?

Creatrol's millimeter-wave sensors can detect human movement within the required range in real-time, accurately identifying motion to control the activation and deactivation of smart devices. The sensing range of millimeter-wave radar depends on the "target object," "detection environment," hardware configuration, and antenna design, requiring specific application testing and evaluation.

How Does Millimeter-Wave Differ from Common Sensors?

Millimeter-wave sensors are theoretically suitable for various radar applications. Compared to radar using 5.8G/2.4G/sub-1G/sub-10G electromagnetic waves, millimeter-wave sensors have lower transmission power and better sensing performance. Unlike infrared, ultrasonic, laser, and camera sensors, millimeter-wave sensors have different detection environment requirements and can complement these common sensing technologies to maximize sensing needs.

Is Millimeter-Wave Sensor Sensitivity Affected by Weather?

Millimeter-wave sensors emit electromagnetic waves and do not rely on medium propagation. With their inherent wavelength characteristics, they possess high energy penetration and diffraction capabilities. They are insensitive to non-metallic material obstructions and have been experimentally verified to effectively penetrate materials like drywall, glass, plastic, and dry surfaces, unaffected by rain, fog, or dust.

Are Millimeter-Wave Sensors Commonly Used for Traffic Speed Measurement?

No, millimeter-wave radar is not the only method used for traffic speed measurement. Common methods include inductive loops embedded in the road, ultrasonic, infrared, laser, millimeter-wave radar, and video speed detection. The "electronic eyes" commonly used in traffic monitoring often combine millimeter-wave radar with high-speed cameras to capture images.

How Does Millimeter-Wave Radar Measure Speed?

Millimeter-wave radar speed measurement is based on the Doppler effect. When there is relative motion between the emitted electromagnetic waves and the target, the frequency and phase of the radar return signal change accordingly. The radar calculates the target's speed relative to the radar by detecting the phase difference in the intermediate frequency signal.

Can Millimeter-Wave Signals Penetrate Glass? Will It Weaken the Reflection Signal?

Millimeter-wave signals can penetrate glass, but the penetration capability depends on the frequency and thickness of the glass. While some signal attenuation may occur, millimeter-wave sensors can still effectively detect glass-type transparent obstacles, reducing collision risks. This is particularly useful for robots like drones and vacuum cleaners that often fail to recognize glass using optical sensors like cameras and infrared.

What Are the Measurement Ranges for Distance and Angle in Millimeter-Wave Sensors?

The distance measurement range and angle detection capability of millimeter-wave sensors depend on the specific sensor design and application. For example, in gesture recognition applications, which require high bandwidth and are typically short-range, the sensors can achieve high precision. Creatrol's millimeter-wave sensor SoC supports a 4GHz frequency sweep bandwidth, enabling precise short-range measurements. The distance accuracy is determined by bandwidth and signal-to-noise ratio, independent of the distance to the target.

Product and Functionality

Detection Principle of Your Sensor

Our radar operates using the FMCW method, whereas infrared sensors utilize the pyroelectric method.

What Distinguishes Your Radar Technology?

Our radar technology employs 24G FMCW (Frequency-Modulated Continuous-Wave) radar, which operates at a higher frequency compared to the 5.8G Doppler radar used by some sensors. This higher frequency enables millimeter-level detection with significantly greater precision. When combined with our proprietary algorithms, it ensures highly accurate detection results. Additionally, our sensor features an integrated light meter function. The light-sensing chip measures real-time illuminance, providing more accurate readings of indoor light levels than sensors that rely on photoresistors. This function is fully digital.

Principle of the Radar Breathing Presence Sensor and Its Naming

The core detection component of our radar sensor is the 24G millimeter-wave radar. Coupled with our exclusive computational algorithms, it can precisely detect the expansion and contraction of the chest during human respiration, thereby accurately determining the presence of an individual within a space. This capability enables more precise and intelligent scene settings, which is the basis for its designation as a breathing presence sensor.

Inability of Infrared Motion Sensors to Detect Breathing Presence

Infrared sensors function by detecting moving heat sources. The subtle chest movements associated with breathing are insufficient to trigger an infrared sensor.

Detection Capability Under a Thick Blanket

Yes, it can detect an individual sleeping in bed under a thick blanket. Provided that the sensor is installed correctly and the radar is within 2 meters of the chest, it can penetrate a blanket of normal thickness.

Millimeter-Wave Breathing Presence Sensors: Potential for Inadvertent Activation by Pets

The likelihood of inadvertent activation by pets is contingent upon the installation distance and the size of the pet. Based on empirical testing, pets weighing less than 3 kg are generally undetectable when the sensor is installed at a height of 2.5 meters.

Signal Penetration through Various Materials

The signal penetration capabilities are influenced by the material properties and distance. Given that the sensor operates at a 24G high-frequency, its penetration ability is relatively limited. For ordinary gypsum board partitions, glass, and wooden doors, the sensor typically cannot penetrate effectively if the distance exceeds 2 meters (penetration beyond 2 meters is generally not feasible).

Radiation Emission and Power Consumption

The sensor emits minimal radiation. The power consumption during normal operation does not exceed 0.5W.
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