Ultrasonics is generally described as the technology of sound above the range of human hearing. The use of the term “sound,” however, is questionable since “sound” would imply something we (humans) can hear. It all comes down to the question asking, “If a tree falls in a forest and there is no one there to hear …
Before I start applying all of our new knowledge about sound to a discussion of ultrasonics, I thought I would interject this little tidbit of useful information about power configurations. Despite the fact that most companies employ skilled electricians, many of the people involved in specifying and designing cleaning (and other) equipment that uses electrical …
Previous blogs have introduced the phenomenon of resonance. In fact, most objects can resonate at more than one frequency and in multiple modes of vibration. This blog will concentrate on resonance at multiples of the the fundamental frequency. These are “harmonics” of the fundamental frequency. A good model to demonstrate the principle of resonance at multiples …
A previous blog explored some potentially useful properties of resonance. The fact that resonance has the power to convert sound wave pressure into mechanical motion can be very useful. On the other hand, however, the fact that it takes so little effort delivered at the proper frequency to excite resonance also has its “down” side. …
Resonance, as discussed in a previous blog, can be either or both beneficial and/or detremental. This blog will explore the beneficial qualities of resonance. Consider the model of a child’s swing discussed in the preceding blog. We all know that by “pushing” or “pumping” at the right time can easily make the swing go higher and …
Nearly everyone has heard the term “resonance” or “natural frequency” but everybody has a little different idea of what resonance is all about. In fact, this is understandable because resonance means different things under different situations and there are many different ways to produce resonance. Resonance is the condition that arises when, at a specific frequency …
The way in which sound sources operating at the same frequency combine to produce constructive and destructive intereference was discussed in a preceding blog. In today’s blog, we will explore how sounds of two different frequencies combine to produce beat frequencies. Two sound sources operating in phase at the same frequency produce reinforcement or constructive …
Sound waves produced by multiple sources, or even within a single source in some cases, interact with one another to produce a variety of interesting and useful results. These interactions are commonly referred to as “interference” but one should not automatically conclude that this kind of interference is in any way related to the interference …
The speed at which sound travels through a sound conducting media varies depending on the media. In general, sound travels faster in liquids than it does in gasses. Solids are the best conductors of all beating out both liquids and gasses. The speed at which sound travels through most materials depends on several variables including …
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