My estimations

My estimate is that about 75% of ultrasonic transducer companies are using impedance analysis to capture relevant data.

Of those companies, my estimate is that only 5% have a good understanding of impedance analysis, which is THE essential tool for ultrasonic transducer analysis.

How do I know this? I work with several piezoelectric and ultrasonic transducer companies and have had many many sales calls with such companies (slightly less than 1 to 2 calls per week for the last year). 

The "what" the why" and the "how"

This brings me to the point of this article, which is the “what”, the “why”, and the “how” of impedance analysis.

What

The 75% of companies that use impedance analysis have partially achieved the “what”, that is, they are routinely taking impedance measurements and are aware what data they should capture.

Why

But of those companies, only 5% have a good understanding of what they are looking at. This is the “why”. Only those 5% can deeply explain the physical phenomenon behind what causes the impedance response. I created my course on impedance analysis to help companies get to this stage, to perfect both the “what” and the “why”.

How

Even a smaller subgroup are those companies who can use impedance data to stare deeply into the soul of their devices. These companies are able to make nontrivial analysis based on impedance data. They make surprising decisions based on what they see, what they can explain, and what they can back up with other experimental proof. I'd put this percentage at 0.5% or 1/200 companies. This is the “how” level. Top notch.

The method to achieve the "how" level

How can you get to the “how” level? No amount of instruction can get you there. You need to do purposeful experiments for learning while having mastery of the “what” and “why”. I'd like to say I have achieved this though my PhD studies where I was afforded the opportunity to dig in to the subject very deeply. But you don't need to go back to school. This level is open to any company willing to go through the first two stages and then willing to dedicate time to feed their fundamental curiosity regarding physical relationships through experimentation.