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Monitoring AC-Yokes by using the Ht-, B*-, DI/I- and the Twin Induction methods

Thomas Aastroem
Pohjola Non-Life Insurance Company Ltd.
Lapinmaentie 1, 00013 POHJOLA, Finland
Contact

ABSTRACT

1. INTRODUCTION

2. INDIRECT CALIBRATION METHODS

3. DIRECT CALIBRATION METHODS

4. PRACTICAL COMPARISONS

5. REFERENCES

  1. Aastroem, T., 1999. Monitoring the level of magnetization in AC-yokes by utilizing the twin induction method. Doctoral thesis. Acta Polytechnica Scandinavica. Mech.Series No.135. Espoo.128 p.
  2. Aastroem,T.& Hansen H., 1989. Comparison of different field strength measurement methods. Proc. of the 12th WCNDT, Amsterdam. p. 382-84.
  3. EN 10084. 1998. Case hardening steels. Technical delivery conditions. European Standardization Organization. 35 p.
  4. prEN ISO 9934-3.1999. Nondestructive testing. Magnetic particle testing - Part 3: Equipment. European Standardization Organization. 16 p.
  5. Stadthaus, M., Haeger, H.& Kruse, J., 1994. Measurement of the magnetization in magnetic particle testing. Proc. of the 6th ECNDT, Nice. p.689-93.
  6. Walther, K.G.,Walther, R.G.& Watt, A.M., 1992. Computer monitoring of coupling in magnetic particle testing. Materials Evaluation 50. p.1237-45.

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