Is the reversing radar ultrasonic or electromagnetic wave?
1 Answers
Reversing radar uses ultrasonic waves because they have better directivity. Ultrasonic waves are sound waves with a frequency higher than 20,000 Hz. They have good directionality, strong penetration ability, and are easy to obtain concentrated sound energy, making them suitable for distance measurement, speed measurement, cleaning, welding, crushing stones, sterilization, and disinfection. In contrast, electromagnetic waves are commonly used for data transmission. By utilizing ultrasonic waves for echolocation, the distance between the car and obstacles can be detected, providing the driver with corresponding information. During reversing, warning sounds indicating distance will be emitted, allowing the driver to perform rational operations based on the warnings to achieve smooth parking. The reversing radar mainly consists of three parts: ultrasonic sensors, a controller, and a buzzer. When it operates, the ultrasonic sensors emit ultrasonic waves outward. When these waves hit an obstacle, they bounce back and are received again by the ultrasonic sensors. The controller then calculates the distance between the car and the obstacle based on the time taken for the ultrasonic waves to be emitted and reflected back. Finally, the buzzer emits warning sounds to alert the driver.
