| 摘要 |
<p>The device comprises a magnetic circuit (2) made from ferromagnetic material with a magnetic field sensor (5) held in an air space (4) between two ferromagnetic bars (3) of the circuit. The bars are connected by a U-shaped device (7), which completes the magnetic circuit. The arms (7a,7b) of the U device are wider than the bar of the U. The two arms of the device have edges (8a,8b) at their free ends (9a,9b). The bars are spaced a distance (d) from the edges and approximately in the middle of the width of the two arms of the U.</p> |
