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人能听到声音是由于物体振动产生的,它的频率在20Hz-20kHz范围内. 超过20kHz称为超声波,低于20Hz的称为次声波. People can hear sound due to the vibration of objects, and its frequency is in the range of 20Hz-20kHz. Exceeding 20kHz is called ultrasound, and below 20Hz is called infrasound.

超声波传感器利用声波特性,提供一种无接触的、精确的检测物体状态和距离的检测方案。 通过发射频率很高的机械声波,传感器收到遇到物体反射回来的声波,经过计算发射和接收声波之间的时间或能量,得到目标物的精确距离或状态。Ultrasonic sensor uses the characteristics of sound waves to provide a non contact and accurate detection scheme for detecting the state and distance of objects. By transmitting high-frequency mechanical sound waves, the sensor receives the sound waves reflected from the encountered object, and calculates the time and energy between the transmitted and received sound waves to obtain the precise distance and state of the target.

超声波传感器不同于普通的接近开关和光电传感器。 相比电感式或电容式接近开关,它的检测距离更长;相比光电传感器,它可以应用在更恶劣的环境中,不受目标物的颜色以及空气中灰尘、水雾等影响。 适合检测不同状态的物体,如液体、透明材质、反光材质和颗粒物等。Ultrasonic sensors are different from ordinary proximity switches and photoelectric sensors. Compared with inductive or capacitive proximity switches, it has a longer detection distance. Compared with photoelectric sensors, it can be used in harsher environments without being affected by the color of the target and dust and water mist in the air. Suitable for detecting objects in different states, such as liquids, transparent materials, reflective materials and particles

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