| 摘要 |
<p>An alternating magnetic excitation field is generated in the flux concentrators (11, 12) of a Hall effect device, including a Hall element (13), by passing an a.c. current through a coil (14). This alternating field serves to drive the flux concentrators into and out of saturation. In the presence of a d.c. magnetic field and when a Hall current is applied to the Hall element, a second harmonic component is generated in the output voltage of the Hall element (13); the amplitude of the second harmonic component providing a measure of the d.c. magnetic field. In an alternative arrangement (Fig. 4) the flux concentrator means is in loop form rather than in a flat configuration as in Fig. 3.</p> |
