11
The Fe-scanner
is intended for examination of ferromagnetic
materials . Its construction (Fig . 5) is similar to the construction of
the dynamic Al-scanner: elements pos. 1–6 (see the description of
Fig . 4) .
The specific feature of this type of the scanner is a magnetic
excitation system (Fig. 5 pos. 7, pos. 7) which includes a source of
permanent magnetic field adjustable by the flywheel (pos. 9) and
magnetic cores with polar tips (pos . 8) .
To excite magnetic stray fields of the defects located in
the subsurface layers of a ferromagnetic object, during magnetic
copying polar tips (pos. 9) of the magnetic excitation system should
make tight contact with magnetic tape and the examined surface .
1 – body;
2 – inductor;
3 – screws for fixing
the inductor;
4 – elastic pressing
cushion;
5 – arrow (with a symbol
indicating
the
type
of
examined materials) which
shows the direction of
scanning;
6 – cable for connecting
the scanner to the controller;
7- magnetizing
attachment (18 mm);
8 – polar tips;
9 – flywheel adjusting
the level of magnetization .
External view of Fe-scanner
Figure 5
7
8
1
6
5
9
3
2
4
