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Can anyone suggest a method of detecting the presence or absence of a small iron object behind a sheet of steel? The object of interest is a
small (10mm diameter) sphere of iron located behind and in contact with a sheet of steel which is approximately 2mm thick. The purpose is to determine if the small iron object is missing, so the method must be very reliable.
It is not possible to view inside the assembly, so means such as optical sensors cannot be used. The sphere is rigidly mounted, so it cannot be "rattled". There are no other externally visible indicators (but yes, it does need to be installed in the assembly).
I doubt that a normal inductive sensor could pentrate the sheet of steel (but I would be willing to consider any suggestions along that line). X-rays sound dangerous and expensive. Does anyone have any other ideas?
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Michael Griffin
London, Ont. Canada
[email protected]
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small (10mm diameter) sphere of iron located behind and in contact with a sheet of steel which is approximately 2mm thick. The purpose is to determine if the small iron object is missing, so the method must be very reliable.
It is not possible to view inside the assembly, so means such as optical sensors cannot be used. The sphere is rigidly mounted, so it cannot be "rattled". There are no other externally visible indicators (but yes, it does need to be installed in the assembly).
I doubt that a normal inductive sensor could pentrate the sheet of steel (but I would be willing to consider any suggestions along that line). X-rays sound dangerous and expensive. Does anyone have any other ideas?
**********************
Michael Griffin
London, Ont. Canada
[email protected]
**********************