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    • Non-destructive evaluation of defects in ferromagnetic plates using a sensitive magnetic sensor based on second harmonic response of superconducting Bi1.6Pb0.4Sr2Ca2Cu3O10+𝛿 pellet

      Abhijit Ray T K Dey

      Magnetic Materials Volume 25 Issue 2 April 2002 pp 101-107

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/025/02/0101-0107

    • Keywords

       

      BPSCCO superconductor; second harmonic response; magnetic sensor; non-destructive evaluation.

    • Abstract

       

      The characteristics of a magnetic sensor, based on the non-linear electromagnetic response of the weak links present in polycrystalline BPSCCO superconductor are reported. The second harmonic response of the sensor in an alternating magnetic field at 40 kHz and at 77 K being a strong linear function of low d.c. field is utilized for magnetic field sensing. The noise limited resolution of the sensor is found to be 3.16 × 10-9 T/√ Hz for 𝐻a.c. = 16 G and frequency 40 kHz. The magnetic sensor has been applied for non-destructive detection of various types of flaws in ferromagnetic plates and also for detection of small magnetic inclusions in a non-magnetic matrix. Our results suggest that the 2𝑓 response based BPSCCO superconductive magnetometer has potential for its appication in the area of non-destructive evaluation of defects in ferromagnetic materials.

    • Author Affiliations

       

      Abhijit Ray1 T K Dey1

      1. Cryogenic Engineering Center, Indian Institute of Technology, Kharagpur 721 302, India

    • Dates

       
      Published
      April 2002
      Manuscript received
      27 August 2001

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