Is it possible to get the same amplitude (in microns) from two different frequency

- Dec 27, 2017-

Is it possible to get the same amplitude (in microns) from two different frequency

Yes and No.

A 40 kHz ultrasonic transducer will produce less amplitude than a 15 kHz transducer, however amplitude can be modified through the booster and horn as well.

First, the amplitude that comes from each transducer is dependent not just on the frequency, but on the manufacturer and transducer type as well.

Let’s take Altrasonic transducer  as an example. A standard 40 kHz transducer produces 8 microns of amplitude. A standard 15 kHz transducer produces 30 microns of amplitude.

However, you can get the same amplitude at the horn face depending on the gain factor of the booster and horn used.

For example, if you use a 2.5 ratio booster and a horn with a gain of 3.0 with a 40 kHz transducer, the resulting amplitude at the horn face will be:

8 * 2.5 * 3.0 = 60 microns

If you use a 1.5 ratio booster and a horn with a gain of 1.33 with a 15 kHz transducer, the resulting amplitude at the horn face will be:

30 * 1.5 * 1.33 = 60 microns

Now, there are two other things to keep in mind.

First, a plastic material will require less amplitude to weld at 40 kHz than at 15 kHz, because the vibration frequency is more than twice as fast.

Second, there are limitations in tooling size which change with ultrasonic frequency. The higher the frequency, the smaller the tool that can be manufactured.


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