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Instructions for Selection of Ultrasonic Transducer

Ultrasonic transducer is an energy conversion device, which is also known as ultrasonic vibrator and ultrasonic vibrator. Its function is to convert the input electrical power into mechanical power (ultrasonic waves) and then transmit it out, while itself consumes a small part of the power (less than 10%). Therefore, the most important issue to consider when using ultrasonic transducers is the matching with the input and output terminals, followed by mechanical installation and matching dimensions. There are many kinds of ultrasonic machinery on the market, and customers must provide accurate and reliable indicators to ensure that the transducer products provided by the company can be well matched with your company's machines and exert the best performance. Due to the variety of ultrasonic transducers, this article only provides some ultrasonic transducer parameters.

 

1. Ultrasonic transducer resonance frequency

 

The frequency refers to the frequency measured by the transmission line method with a frequency generator and a millivoltmeter, or the frequency measured with an impedance characteristic analyzer or the like. It is generally referred to as the small signal frequency. It is relative to the frequency of the machine. That is, the customer connects the transducer to the drive power supply through a cable and the actual working frequency is measured when it is no-load or loaded after power-on. Due to the different matching circuits of customers, the same medical ultrasonic transducer with different driving power shows different frequencies and such frequencies cannot be used as the basis for ordering.

 

2. Capacitance of ultrasonic transducer

 

That is the free capacitance of the transducer. Simply speaking, measuring with a general portable capacitance meter can also meet the requirements.

 

3. The working mode of ultrasonic transducer

 

Due to different processing methods and requirements, the working modes of transducers can be roughly divided into continuous work and pulsed work. Different working modes have different requirements for transducers. In general, continuous work has almost no pause time, but the operating current is not very large. Pulsed work is intermittent. There are pauses, but the instantaneous current is very large. On average, both states are very powerful.

 

4. Ultrasonic transducer form and maximum power

 

The manufacturer of the complete machine may have different regulations on the nominal power of the machine for different purposes and purposes. In other words, the same ultrasonic transducer used on different machines may have different nominal powers. In order to avoid ambiguity, the customer should specify the structural form of the transducer, such as cylindrical, inverted flare, etc., and the diameter and number of piezoelectric ceramic chips.

 

5. Ultrasonic transducer installation and matching dimensions

 

There are mainly horn material, surface treatment and shape. The connecting thread between the transducer and the horn, the connecting thread between the horn and the die, the diameter, thickness, number and position of the notch or screw holes at the flange of the horn.

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