How does an ultrasonic transducer produce ultrasound？

Ultrasonic transducers are used widely in a variety of industries. It functions as a key component for a great range of machines, such as the ultrasonic cutting machine, ultrasonic sewing machine and ultrasonic welding machine. It could generate sound waves in the ultrasonic range by turning electrical energy into sound. So, how does this magical process works exactly? Please allow me to introduce this to you in detail.

Here is the content list:

l What is an ultrasonic transducer?

l What are the main parts of an ultrasonic transducer?

l How does an ultrasonic transducer produce ultrasound?

What is an ultrasonic transducer?

ultrasonic transducers are devices that generate or sense ultrasonic energy. The components of an ultrasonic transducer can be divided into three categories: transmitters, receivers and transceivers. The transmitter converts electrical signals into ultrasound, the receiver converts ultrasound into electrical signals, and the transceiver can send and receive ultrasound. In many automated factories and processing plants, ultrasonic sensors can detect the movement of a target and measure the distance to the target. The sensor can have an on or off digital output for detecting movement of an object, or an analog output proportional to the distance. Also, they can detect the edges of the material as part of the web guiding system.

What are the main parts of an ultrasonic transducer?

The ultrasonic transducer has five main parts, which are:

1. Crystal/ceramic components with piezoelectric properties that are usually lead zirconate titanate (PZT). Such components may contain one element, or may be containing multiple elements. Also, the thickness of the component is determined by the required resonance frequency as thicker components will produce lower frequency oscillations, while thinner components will produce higher frequency oscillations

2. Positive electrode and ground electrode on the surface of the device. This is the component that allows electrical connection.The positive electrode is on the back of the component while the ground electrode is in front of the device.

3. Damping (support) block, which is attached to the back of the crystal component(behind the positive electrode). It functions to absorb the ultrasonic energy directed to the rear and attenuate the stray ultrasonic signal from the housing. Another function of the damping block is to suppress the resonant vibration in the component, thereby generating a shorter spatial pulse length. In this way, a better axial resolution and higher bandwidth can be obtained.

4. Matching layer, which is the interface between the transducer element and the work piece. It works by minimizing the reflection caused by traversing different media (acoustic impedance), so that the transmission of ultrasound from the component to the tissue can be close to 100%. That amazing work is achieved especially because of its being composed of a material layer with an acoustic impedance between the work pieces and the transducer material.

5. Housing, which is an lectrical insulation and a component protection. To put it in a more specific way , this component includes a plastic box, metal shielding layer and sound insulation material.

How does an ultrasonic transducer produce ultrasound?

After all those introductions about the components of ultrasonic transducer and the device itself, you must be so eager to know how exactly does this device make ultrasound. Well, this is a pretty easy question, the piezoelectric crystals inside the ultrasonic transducer probe that I mentioned above are what bring all this about: As the crystals change their shape when an electrical current is applied to them. The vibrations or shape changes of them create sound waves that move outward, and all the crystals are repeatedly activated many times in such a way, so that the ultrasound is created and are jetted out.

If you are looking for a reliable ultrasonic transducer to purchase, please make sure you check out the ones in Hangzhou Shengpai Technology Co., Ltd, their nice and high-quality machines are definitely appealing to your unique taste.