How to choose right ultrasonic transducer

How to choose right ultrasonic transducer

An ultrasonic transducer is an energy conversion device whose function is to convert the input electrical power into mechanical power (ie, ultrasonic waves) and then pass it out, while it consumes a small amount of power (less than 10%). Therefore, the problem to be considered when using an ultrasonic transducer is the matching with the input and output terminals, followed by the mechanical mounting and mating dimensions. There are many types of ultrasonic machinery on the market, and customers must provide accurate and reliable indicators to ensure that the transducer products provided are well matched to your machine and perform well.

Ultrasonic transducer

Due to the wide variety of transducers, we introduces some of the transducer parameters here.

1 Resonant frequency: f, Unit: KHz

The frequency refers to a frequency measured by a transmission line method using a frequency generator, a millivoltmeter, or the like, or a frequency measured by an impedance analyzer or the like. Generally known as the small signal frequency. Opposite to it is the upper frequency, which is the actual operating frequency measured by the customer when the transducer is connected to the drive power supply via a cable and is unloaded or loaded. Because the matching circuits of the customers are different, the same transducers are different in frequency with different driving power sources. Such frequencies cannot be used as order basis.

2 Transducer capacitance: CT, unit: PF

That is, the free capacitance of the transducer can be measured by a capacitor bridge at a frequency of 400 Hz - 0 Hz, and an impedance characteristic analyzer can also be used. To be simple, the measurement with a general portable capacitance meter can also meet the requirements.

3 transducer working mode

Due to different processing methods and requirements, the working mode of the transducer can be roughly divided into continuous work (lace machine, CD set machine, zipper machine, metal welding, etc.) and pulse type work (such as plastic welding machine). Different working methods The requirements for the transducer are different. In general, continuous operation has almost no pause time, but the operating current is not very large, the pulse operation is intermittent, there is a pause, but the instantaneous current is very large. On average, the power of both states is large.

4 transducer type and high power

The machine manufacturer may have different specifications for the nominal power of the machine for different purposes and purposes. In other words, the same transducer may have different nominal powers used on different machines. In order to avoid ambiguity, the customer should specify the structure of the transducer, such as column type, inverted horn type, etc., and the diameter and number of piezoelectric ceramic wafers.

5 Installation and mating dimensions

Mainly horn material, surface treatment, shape. The transducer is connected to the horn, the horn is connected to the mold thread, and the diameter, thickness, notch or number and position of the flange of the horn flange.