In a preceding blog I explained how sound waves are produced by a vibrating or pulsing source. Today, I want to take a few minutes to talk about the way sound waves travel through a sound conducting medium and reflect from surfaces. Many years ago in high school physics class, I was taught that sound waves …
Another of the basic properties of sound waves is frequency. Frequency is what we commonly call the pitch or tone of a sound. A higher frequency results in a higher tone while lower frequency results in a lower tone. Within the human hearing spectrum, a piccolo produces higher frequency or higher tones while a tuba …
In the preceding post I explained how sound waves are created by a vibrating or pulsing source and how they are conducted by a sound conducting media. Amplitude, Frequency and Wavelength are characteristics of sound waves that will be important to understand as we progress to an understanding of ultrasonics. Today’s topic is amplitude. The above …
The first step to an understanding of ultrasonics is to understand the physics of sound. Sound is vibration conducted from a vibrating or pulsing source. Sound is transmitted by all matter with variations in efficiency and speed depending on the nature of the matter and its environment. In general, solids are the best sound conductors …
The next series of blogs will explore ultrasonic cleaning in some detail. Today’s blog is an introduction to the world of ultrasound. The theory of sound was first defined and understood a little over 100 years ago when Lord Rayleigh published The Theory of Sound. Rayleigh was a Nobel Prize winner and, was also responsible for a number of …
Now it’s time to see the results! Particles have been harvested, collected and are ready to either be weighed or counted. The first step in evaluating cleanliness using either method is to examine the specification. There are two basic types, part-specific and generic. Part-Specific Specifications – Part-specific specifications will state the sample size in number …
In preceding blogs we have talked about harvesting particles for evaluation and talked about specifications. Specifications may or may not dictate the harvesting process but almost always provide detail on how to evaluate the particles harvested in a process involving re-washing. The first step is to concentrate the harvested particles for evaluation. This usually involves a filtration and evaporation process. …
Before we get into quantifying the particles we have harvested in the last few blogs, I would like to take a minute or two to talk about the specifications that define and govern the evaluation process. In upcoming blogs we will talk about the quantification of particles in general terms. In real life, there is …
Although manual re-washing techniques for harvesting particles are effective for a wide range of particle types and sizes, they may fall short in collecting particles that are very small (less than 10 or 20 microns) or difficult to remove from the surface of the substrate for one reason or another. Ultrasonics, which has long been the “gold standard” of cleaning, …
The evaluation of cleanliness is often based on a quantification of the particles left on a surface following the conventional or production cleaning process. The first step in evaluating a part for cleanliness with regard to particles is to harvest those particles that remain after cleaning. Once harvested, the particles can be counted, weighed, microscopically …
English
Spanish
Chinese
Canada
Mexico
United Kingdom
