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Abstract <p>This study presents a comparative investigation of two inductive circuit configurations employing planar coils for magnetic particle detection. The sensor element was a flat PCB coil, which proved to be effective while maintaining a compact design. The first circuit, based on a Colpitts oscillator, has relatively low sensitivity, however, offers the possibility of digital detection through frequency variation. In contrast, the second configuration, a modified Maxwell bridge composed of resonant second-order differential filters, exhibited significantly higher sensitivity and a linear response for small inductance variations. Experimental validation with magnetic samples of varying magnetic iron content confirmed that both circuits are capable of correlating voltage variations with the content iron.</p>

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Comparative Study of Inductive Circuit Configurations with Planar Coils for Magnetic Particle Detection

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. Acuna,
  • A. Ignatov,
  • N. A. Yudanov,
  • Ch. Gritsenko,
  • T. V. Rudakov,
  • V. P. Kirillov,
  • A. Sobko,
  • V. Kolesnikova,
  • L. V. Panina,
  • V. Rodionova

摘要

Abstract

This study presents a comparative investigation of two inductive circuit configurations employing planar coils for magnetic particle detection. The sensor element was a flat PCB coil, which proved to be effective while maintaining a compact design. The first circuit, based on a Colpitts oscillator, has relatively low sensitivity, however, offers the possibility of digital detection through frequency variation. In contrast, the second configuration, a modified Maxwell bridge composed of resonant second-order differential filters, exhibited significantly higher sensitivity and a linear response for small inductance variations. Experimental validation with magnetic samples of varying magnetic iron content confirmed that both circuits are capable of correlating voltage variations with the content iron.