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Monthly Archives: September 2011
Ultrasonics – Understanding Sound – Waves 1
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 … Continue reading
Posted in Definitions, Ultrasonics
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Ultrasonics – Sound – Frequency
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 … Continue reading
Ultrasonics – Sound – Amplitude
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 … Continue reading
Posted in Definitions, Ultrasonics
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Ultrasonics – Understanding Sound – Waves
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 … Continue reading
Posted in Definitions, Ultrasonics
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Ultrasonics – Introduction
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 … Continue reading
Posted in Definitions, Ultrasonics
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Lab Tales – Don’t Put Your Finger in There!
The test laboratory is a special kind of place. The work conducted in the laboratory is experimental which usually indicates that we are trying things that have not been tried before to see what happens or doesn’t happen. Fortunately, at … Continue reading
Is It Clean – Particles – Particles Resulting from Metal Finishing
There are a number of metal finishing process which should be avoided in the manufacture of items subject to demanding specifications with regard to the presence of particles. These common processes, although employed with the best intent, result in the … Continue reading
Posted in Cleanliness Testing, Laboratory Testing
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Is It Clean – Particles – Particle Generating Substrates
Some substrate materials are inherent particle generators and may never be cleaned to the point of there being no particles present. With these materials, particles are a way of life and can not be avoided. This, of course, makes cleanliness … Continue reading
Posted in Cleaning, Cleanliness Testing, Laboratory Testing
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Is It Clean? – Particles – Exceptional Particles – Magnetism
Before we leave the subject of particles and particle counting, there are some things we need to touch on regarding “exceptional” particles. In an earlier blog, Particles That Don’t Count?, we discussed briefly some particles that may or may not count when … Continue reading
Posted in Cleaning, Cleanliness Testing, Laboratory Testing
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Is It Clean? – Particles – Liquid Particle Counting
In recent blogs we have been talking, for the most part, about particles that are relatively large – ones you can see, touch and feel. There is a world out there, however, that worries about particles that are very tiny. … Continue reading