Why Don’t All Models Include Sweep Frequency?
Although sweep frequency provides clear benefits, it requires more advanced electronic control and feedback circuitry.
Compared with a fixed-frequency design, the generator circuit is more complex and the selling price is higher. Therefore, not every application requires sweep frequency.
For example:
• Metal parts or heavy oil contamination: fixed-frequency cavitation provides stronger cleaning power.
• Optical and semiconductor industries: sweep frequency can provide gentler and more uniform cleaning.
Therefore, sweep frequency is often used in mid- to high-end or multi-tank equipment, especially for industries that require high cleanliness and stable cleaning performance.
What Is the Sweep Frequency Function?
In ultrasonic cleaning equipment, sweep frequency is a technology that slightly varies the frequency around a fixed center frequency.
For example, if the equipment is designed as a 40 kHz model, the actual output frequency may slightly vary within the range of 39–41 kHz.
This small variation helps make the ultrasonic energy distribution inside the cleaning tank more uniform, preventing standing waves or cleaning dead zones caused by a fixed frequency.
Unlike frequency adjustment, sweep frequency does not switch to a different frequency range or change the transducer. It only makes small continuous adjustments within the center frequency range to achieve more stable and uniform cleaning performance.
How Sweep Frequency Works ?
1. Fixed-Frequency Problem:
When the generator outputs a fixed frequency for a long period of time, standing waves may easily occur inside the cleaning tank, causing uneven energy distribution.
• Some areas may have excessive energy, which may damage the workpiece surface.
• Some areas may have weak energy, resulting in incomplete cleaning or cleaning dead zones.
2. Sweep Frequency Solution:
The sweep-frequency generator slightly varies the output frequency within a range of about ±1 to ±2 kHz, so the sound pressure distribution is no longer fixed.
This helps make cavitation more stable and distributes energy more evenly throughout the tank, improving cleaning uniformity and overall cleaning performance.