College Physics ›› 2020, Vol. 39 ›› Issue (9): 34-40.doi: 10.16854 /j.cnki.1000-0712.200001

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High-frequency resistance of metal and the method of its measurement and correction

ZHOU Rong-hao,YANG Yong,ZHANG Qing,TIAN Fa-bao   

  1. School of Mathematics and Physics,China University of Geosciences ( Wuhan) ,Wuhan,Hubei 430074,China
  • Received:2020-01-03 Revised:2020-03-06 Online:2020-09-20 Published:2020-09-25

Abstract: Resistance is an important physical parameter of metal materials. The measurement of high-frequencyresistance is affected by the skin effect, the distributed inductance and the capacitance. Rare special experimental measurement is reported about it. In this paper, in the condition that the test objects can be actively changed and the metal filaments are used for the experimental measurement, the high-frequency resistance measurement can better suppress the skin effect. Meanwhile,by analyzing the resistance, inductance and capacitance equivalent circuits of the fixed-shape non-ferromagnetic metal filament samples, the vector voltage analysis data is obtained by a frequency-sweeping phase-locked amplifier. The method of optimal matching is used to successfully modify the influence of the high -frequency distributed inductance and capacitance on the high -frequency resistance measurement of metals from the perspective of engineering practice. An improved method for high - frequency resistance measurement of ferromagnetic metals is also proposed. The electrical conductivity of the metal remained unchanged at high frequency,which is consistent with the theoretical analysis results. This study provides measurement ideas for higher frequency resistance,and has also significance for improving electromagnetic nondestructive testing and electromagnetic compatibility research and design.

Key words: resistance, skin effect, distributed capacitance, distributed inductance, high-frequency