Hei Inspektører!
A few days ago I was writing a bit about a type of sensor called Hall effect and its general application in MFL. I tell you that there are others, one of them is a little better known and used; The reels.
Arrays (Arrays) of these devices are also used to increase coverage and these can be connected physically or electronically so that only discontinuity signals are selected and noise is minimized.
The advantage of coils is that they are strong and relatively inexpensive to manufacture. They can also be molded or rolled to fulfill the inspection task. Their disadvantages are their size, the need to encapsulate them in non-conductive material with good wear characteristics, and their dependence on speed.
There are various factors that influence or affect its operation, but we will elaborate on this issue later.
