资料介绍
70539_03aC
B= L2 S2 P A R( ) d Hav r2 I2
AYDIN AYKAN
Tutzing, Germany
A time-varying magnetic eld at a dened area S can be determined with a calibrated circular loop connected to the input of an appropriate measuring receiver (Fig. 5). There may be a passive or an active network between the loop and the output port. The measuring loop can also include a shielding over its circumference against any perturbation of strong and unwanted electric elds. The shielding must be interrupted at a point on the loop circumference. Generally in the far eld the streamlines of magnetic ux are uniform, but at near eld, in the vicinity of the generator of a magnetic eld, they depend on the source and its periphery. Figure 4 shows the streamlines of the electromagnetic vectors generated by the transmitting loop L1.
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