Reader Question – Ultrasonics – “Near Field”

A reader has asked for a description of how “near field” ultrasonics works.  First of all, the term “near field” is one that is not well defined in the ultrasonic cleaning world.  It appears to well defined and have major significance in non-destructive testing using ultrasonics as indicated in these links  www.signal-processing.com and  www.ndt-ed.org, but there is …

Ultrasonics – Monitoring Ultrasonic Performance

In the blog “Reader Questions – Monitoring Ultrasonic Transducers,” I suggested a couple of ways one might test individual ultrasonic transducers to assure they have not become ineffective due to de-bonding from the cleaning tank.  In an extension of the spirit of that blog, quality control measures for ultrasonic cleaning performance, I decided to check out a paper I …