Why is laser cleaning more efficient than ultrasound?

The efficiency of laser cleaning is higher than that of ultrasonic cleaning‌, mainly due to the technical characteristics and advantages of laser cleaning.


Laser cleaning uses the photothermal effect of laser to produce changes in the thermal expansion coefficient by irradiating the surface of the substrate so that dirt is peeled off from the surface of the substrate. During this process, the laser used by the laser cleaning machine will produce tens of millions of oscillations during cleaning, and the stripped dirt will be shattered by the laser. By adjusting the appropriate cleaning parameters, non-damaging cleaning of the substrate can be achieved. This cleaning method can not only achieve damage-free cleaning, but also because the laser can be transmitted through optical fibers and cooperated with robot hands and robots, it can easily achieve long-distance operations and can clean parts that are difficult to reach with traditional methods. These characteristics give laser cleaning significant advantages in efficiency and cleanliness‌12.

 

In contrast, ultrasonic cleaning is also an effective cleaning method. It uses the cavitation, acceleration, and direct flow of ultrasonic waves in the liquid to, directly and indirectly, affect the liquid and dirt, so that the dirt layer is dispersed, emulsified, and peeled to achieve cleaning purposes. However, this cleaning method is often contact cleaning, which exerts mechanical force on the surface of the object to be cleaned, which may damage the surface of the object or the cleaning medium adheres to the surface of the object to be cleaned and cannot be removed, causing secondary pollution. In addition, ultrasonic cleaning cannot be operated over long distances as conveniently as laser cleaning, and it may also be difficult to clean some hard-to-reach parts‌13.

 

Therefore, laser cleaning is superior to ultrasonic cleaning in terms of cleaning efficiency and cleanliness due to its advantages such as high efficiency, no damage, and long-distance operation.


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