Task At Hand – In a previous blog I declared that I am not a fan of the aluminum foil test for evaluating ultrasonic performance. I question its validity and relevance on a number of fronts. If my purpose here is to question my own skepticism, then I guess I should probably define the factors …
Until recently, I was only able to theorize about the mechanism involved in the perforation of aluminum foil by ultrasonic cavitation. I no longer have to theorize! My theory had always been that perforation of aluminum foil was due to the repeated flexing of aluminum foil as cavitation implosions occurring on opposite sides of the foil …
If you’ve heard of ultrasonic cleaning you’ve probably heard of the aluminum foil test. The practice of putting a piece of aluminum foil into an ultrasonically activated tank of water probably began as a novelty demonstration. The holes produced in the aluminum foil by the collapse of cavitation bubbles at least showed that something interesting …
It was in 1962 during my junior year in high school when my chemistry teacher, Mr. McBain, described an unusual phenomenon related to a specific element. At the time, I think it was more intended as a test question to see who had studied their notes. I recently witnessed this phenomenon for the first …
Drying is the last and often a critical part of a cleaning process. In many cases it is also the most time and energy consuming. It is often the most difficult part of the process to specify and control. Although there are several drying technologies available, blowing with hot air is simple and by far …
With its well-deserved credentials for chemical resistance and durability, stainless steel and particularly 316 grade stainless steel is a “go to” for the fabrication of ultrasonic cleaning tanks. Although it performs well in most applications, there are still those where stainless steel has its limitations. Stainless steel achieves its “stainless” characteristic by developing a very …
The term “near field” is not new to ultrasonic cleaning. In general, it refers to cleaning parts in near proximity to the ultrasound source. It is well known that increasing ultrasonic power density can produce improved cleaning results in many cases. Increasing power density can be accomplished by reducing the size of the cleaning vessel to …
If you are squeamish about electricity or don’t care about electricity you may want to skip this one. But we’re going to talk about some things at are pretty neat, central to the world of electronics and downright cool if you’d like to stick around. Recent blogs have talked about resistors, capacitors and inductors which, …
Just about everyone celebrates a holiday at this time of year. I celebrate Christmas. This year, my wife and I will be spending the first part of the holiday season break with our daughter, her husband and their son in Frisco, TX. Then it’s on to Ellicott City, MD to visit our son, daughter-in-law and …
The blog Ultrasonics – Ultrasonic Generators – Power Control discussed several ways in which the power delivery of ultrasonic generators can be varied. One of the ways is by modulating the amplitude while another is through the use of time proportioning or duty cycle modulation. There are other ways as well, but these are the …
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