What's ultrasonic sensor?

- Mar 30, 2021-

Ultrasonic sensors are sensors that convert ultrasonic signals into other energy signals (usually electrical signals). 

Ultrasound is a mechanical wave with a vibration frequency higher than 20kHz. 

In daily production and life, ultrasonic ranging sensors are mainly used in car reversing radar, robot automatic obstacle avoidance walking, construction sites,

and some industrial sites, such as: liquid level, well depth, pipeline length and other occasions that require automatic non-contact ranging. 

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How does the ultrasonic sensor work

As shown in the figure above, the sensor emits an ultrasonic pulse, and the ultrasonic pulse will be reflected when it encounters the measured object. 

The reflected wave received by the sensor can calculate the distance between the sensor and the measured object by calculating the propagation time of the pulse wave. 


Why choose to use the ultrasonic sensor

Strong anti-environmental interference: It can be used in any lighting environment, and it is reliable under various light conditions such as indoor or outdoor, complex ambient light, etc. 

Non-contact detection of light, smoke, dust, colors, materials, etc....

So some applications are environment ultrasonic sensors are better than infrared sensors, because they are not affected by smoke or black substances. 


Wide range of applications: 

water level detection, UAV applications, automatic obstacle avoidance applications, distance detection applications, etc. can use ultrasonic sensors. 

Multiple uses: 

with/without detection, level detection, position detection, distance detection, etc. 

Most of the non-contact detection needs can be met. 

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