In practice, however, all contributions come from those wire elements adjacent to the surface. ... For o G = GR = 3 x 103 turns/m, A = lOa#39;Lla#39;m2 T p =3 x 103 kg/m3 (3 gm/cm3), v=3xlO3 mysec, one obtains (V/IT)=lOOuV/amp. B = 1T (10 kG), This is roughly the signal in aluminum from a 15 turn, l cm diameter singleended, single- spiral coil measurement. ... made series resonant to increase the coil current while the receiver coil is made parallel resonant to increase the open-circuit voltage.
|Title||:||Proceedings of the Tenth Symposium on Nondestructive Evaluation, April 23-25, 1975, San Antonio, Texas|
|Author||:||American Society for Nondestructive Testing. South Texas Section, Southwest Research Institute|