Theory of Resonant Inspection
When an object is struck by an external energy source, such as when it is "pinged" with a hammer, it will make a sound that is specific to the physical properties of the object, including its size, weight, density, and porosity. An example of where this phenomenon is often used is when determining whether melons are ripe to be picked from the vine. In that case the melon picker "pings" the melon and their trained ear determines whether the melon is ripe to be picked.
This same technique is used by eZ-NDT, except in this case the 600 Series and eZ-NDT software running on a PC replace the trained ear. When an object is pinged with a hammer, the 600 Seires digitizes (records) the sound, which is immediately transferred to the PC for analysis. eZ-NDT software running on the PC decomposes the sound, effectively creating a "signature" that is unique to the object being pinged.
Generally speaking, all objects of similar physical composition will have the same signature. During the Feasibility Study, IPC Systems will confirm that your objects have a unique and measurable signature, and that the signature of known "good" objects is distinguishable from known "bad" objects. Presuming that condition is true, eZ-NDT software learns how to distinguish good objects from bad objects, and provides the operator with a simple PASS or FAIL indication after each object is pinged.
This information has been kindly supplied by:
IPC Systems Ltd.
Tel: +44(0) 1905 338989
For more information of th eZ-NDT software, click here...
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