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Technical Discussions
John Hansen - Hocking NDT Ltd
Director, - Eddy Current Technology
ETher NDE Ltd, United Kingdom, Joined Oct 1999, 74

John Hansen - Hocking NDT Ltd

Director, - Eddy Current Technology
ETher NDE Ltd,
United Kingdom,
Joined Oct 1999
74
05:38 Jun-08-1999
High Speed NDT

Eddy current seems a viable alternative.

Hocking’s new D62s instrument can perform two tests with a bandwidth of 2kHz and our standard surface differential probe (type 5P469) has a 2mm diameter. The 5p469 has been widely used for bearing inspection at .1 mm notch sensitivity. I’ve just checked with a spinning notch on an electric motor and the signal drops to 6 dB at 5 m per second.

So by doing the maths if we assume a 2mm scan pitch on a piece of round material 127 mm dia. and 400 mm long (.16 m^2) and use two probes this gives 8 seconds. There is of course no allowance for handling times. You could of course use a wider probe if you were prepared to accept lower sensitivity and double the inspection rate.

The difficult part is how do you handle a component safely and accurately.
Regards

John Hansen

Industrial Product Manager
Hocking NDT Ltd.
e-mail JohnH@hocking.com
web site www.hocking.com
tel +44 (0) 1727 795509
fax +44 (0) 1727 795409





 
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