| 摘要 |
PCT No. PCT/GB96/00734 Sec. 371 Date May 13, 1997 Sec. 102(e) Date May 13, 1997 PCT Filed Mar. 28, 1996 PCT Pub. No. WO96/31785 PCT Pub. Date Oct. 10, 1996Acoustically controlled magnetic coils comprise first and second electrical conductors which are mechanically coupled by a block of material of defined acoustic transmission characteristics which holds the conductors a predetermined distance apart. The conductors are supplied with currents of different and variable amplitudes and different and variable relative phases both of the features being determined by the acoustic characteristics and by the geometry and predetermined distance.
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