Heating Up a Surface Part 2: Non-Destructive Testing
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Heating Up a Surface Part 2: Non-Destructive Testing
In Part 1 I discussed using a hot water bottle for heating a surface to do emissivity testing. Part 2 extends the approach to another significant application, NDT.
One method of using IR for NDT depends on heating or cooling the surface to generate a thermal signature for sub-surface features or defects. Using a hot water bottle as a method to apply uniform heating to a small surface is an alternative to some of the other methods used for heating. It also offers the possibility of being used for cooling the subject surface. The rate of heat transfer and uniformity can be increased by agitating the hot water bottle during application.
For larger surfaces, larger flexible liquid containers can be used. If the surface is horizontal, an open container can be used.
As before, the surface has to be suitable for direct contact of any sort. It also has to be such that it will not cut or break the hot water bottle or liquid container. In other words, be careful.
Tip Provided by:
Jack M. Kleinfeld, P.E.
Kleinfeld Technical Services, Inc.
4011 Hillman Ave.
Bronx, NY 10463
phone: 718-884-6644
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