| 摘要 |
The ferromagnetic changeover device consists of a wire section (10) in which a jacket part (12) and a core part (11) can be magnetised differently. The wire consists of an alloy of cobalt, vanadium and iron. The jacket part and the core part thus have either a matching state, with the same magnetisation direction of the core part and of the jacket part, or a reverse state, with a different magnetisation direction of the core part and of the jacket part. The coercive force of the core part (11) is sufficiently large for the magnetisation of the jacket part in the matching state not to be able to change the core part over into the reverse state. It is thus possible to change over from one state to the other only by means of an external magnetic field. This results in pulses of more than 1.5 V and with a width of 20 mu s being induced in the case of an external magnetic field having a positive half-cycle with a peak value of 11940 A/m and a negative half-cycle with a peak value of 1592 A/m in a coil having 925 turns on a wire section 10 with a length of 3 cm. The changeover device can be used for determining proximity, time measurement and coding. <IMAGE> |
