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What are Ultrasonic Sensors -Joinwin Electronics Knowledge

What are Ultrasonic Sensors -Joinwin Electronics Knowledge

October 31 , 2023 0

Ultrasonic sensor is a kind of sensor that can convert ultrasonic signal into other forms of energy signal. Ultrasonic waves are mechanical waves that vibrate at frequencies higher than 20kHz. Ultrasonic wave has the characteristics of high frequency, short wavelength, small diffraction phenomenon, especially has excellent directivity, and can become a ray for directional propagation. It is extremely penetrating to liquids and solids, especially in solids that are opaque to sunlight. When the ultrasonic wave encounters impurities or interfaces, it produces significant reflected echoes, and when it meets a moving object, it also produces a Doppler effect.

What Is An Ultrasonic Sensor

An ultrasonic sensor is an electronic device that emits an ultrasonic wave and converts the reflected sound into an electrical signal to determine the distance to a target object. Ultrasound travels faster than audible sound (that is, sound that can be heard by humans). The transmitter, which uses piezoelectric crystals to generate sound, and the receiver, which encounters the sound after it travels to and from the target, are the two main components of an ultrasonic sensor.
Ultrasonic sensors are mainly used as proximity sensors. They can be found in cars' self-parking technology and crash-avoidance safety systems. In addition to robotic obstacle detection systems, ultrasonic sensors are also used in manufacturing technology. Ultrasonic sensors are less susceptible to smoke, gas, and other airborne particles than infrared (IR) sensors in proximity detection applications (although physical components can still be affected by variables such as heat).
Ultrasonic sensors are also used as level sensors in closed containers to detect, monitor and manage level levels, such as large barrels in chemical plants. Most notably, ultrasound technology has enabled the medical community to create images of internal organs, detect malignancies and monitor the health of newborns in the womb.

What Are The Parts OF The Ultrasonic Sensor

Commonly used ultrasonic sensors are composed of piezoelectric wafers, which can transmit ultrasonic waves and receive ultrasonic waves. The small power ultrasonic probe is used for more detection. It has many different structures, which can be divided into straight probe (longitudinal wave), oblique probe (transverse wave), surface wave probe (surface wave), Lamb wave probe (Lamb wave), dual probe (one probe transmits, one probe receives) and so on.

The Working Principle OF Ultrasonic Sensor

Ultrasonic sensors work by emitting sound waves at frequencies above the range of human hearing. In order to receive and transmit ultrasonic waves, the transducer of the sensor acts as a microphone. Like many other sensors, our ultrasonic sensors use a single sensor to send pulses and receive echoes. The sensor calculates the distance to the target by measuring the time elapsed between sending and receiving ultrasonic pulses. The module's operation is simple: it sends out a 40kHz ultrasonic pulse that travels through the air and bounces back to the sensor if it encounters an obstacle or object. Distance can be estimated by multiplying the travel time by the speed of sound.
Ultrasonic sensors are an excellent solution for detecting transparent objects. For example, applications using infrared sensors have difficulty dealing with this particular use case for liquid level measurement due to the target's translucency.
Ultrasonic sensors detect objects unrelated to color, surface, or material for presence detection (unless the material is very soft like wool because it absorbs sound).
Ultrasonic sensors are a trusted solution for detecting translucent objects and other objects where optical methods may fail

Common Application Areas OF Ultrasonic Sensors

Level sensing is the first of the two most common ultrasonic sensor applications because they can detect liquids of any hue or opacity while remaining contactless. The second is universal object detection, which has the advantage of its low cost and simplicity. Vehicle collision detection, person identification, presence detection, box sorting, pallet detection, bottle counting on beverage filling machines, and many other applications are examples of object detection applications