Internal stress relaxation method in magnetic field sensor...

Details Internal stress relaxation method in magnetic field sensor... Internal stress relaxation method in magnetic field sensor...

G - Physics

01

R

G01R 3/00 (2006.01) G01R 33/04 (2006.01)

Patent

CA 2112656

- 6 - SUMMARY Internal stress relaxation method in magnetic field sensor head cores Applicable in the manufacturing process in magnetic field sensor head cores (1) comprising a core of amorphous ferromagnetic material on which is placed directly a first winding that forms the drive coil, and which also includes a second and third windings that constitute the sensor and compensating coils, respectively, both wound over a cylinder inside which is located the assembly formed by the core and the drive coil. A first electric current (2) is applied to the core of this sensor head (1) , which heats up due to its electrical losses. In addition, a second alternating electric current (3) is applied to one of the coils that surrounds the core and which acts as a magnetizing coil; an analysis (4) is made of the signal induced in another of the coils that surround the core and that acts as detector coil and, finally, a decision (5) is taken on the process ending (6) when the level of the signal induced in the detector coil falls down significantly. (Figure 2)

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