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Barkhausen effect based sensor and intellectual system for accurate stress measurements and monitoring in harsh environmental conditions

V.Vengrinovich, V.Tsukerman, Y.Denkevich.
Institute of Applied Physics, Akademicheskaya str. 16, 220072 Minsk, Belarus.
E-mail: veng@iaph.bas-net.by
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1.Introduction

2. Optimal BN frequency range and set-up parameters stability

3. Resolution of BN measurements

4. Investigation of the BNS temperature and stress sensitivity

Conclusions

  1. The new Barkhausen Noise Sensor, Electronic Unit, Software, Measurement, Calibration and Verification techniques for accurate applied stress measurements in harsh environment, system for safety signal transmitting are developed and tested.
  2. New innovations and engineering ideas were developed which made it possible to exceed essentially the known Barkhausen noise sensors parameters particularly: resolution, time and temperature stability, accuracy, portability, insensitivity to disturbing influence and repeatability.
  3. The Barkhausen noise stress sensitivity, reached with new BNS in experiments with steels 300M, 30HGSNA and VNS2 alloy (in the conditions after as-ground heat treatment, shot peening and cad plated), is shown to be sufficient to provide the resolution of 0.06% and accuracy less than 0.4% in the temperature range (-50 ¸ +70) 0C and bending stresses in the range (0 ¸ +800)Mpa under influence of shocks, vibrations, high humidity, electromagnetic field.

References

  1. D.J.Buttle,C.B.Scruby,G.A.D.Briggs and J.P.Jacubovics, The measurement of stress in steels of varying microstructure by magnetoacoustic and Barkhausen emission, Proc. R. Soc. Lond. A 414, pp. 469-497, 1987.
  2. V.Vengrinovich. Barkhausen noise. Theory and applications. Minsk, Nauka i Technika, 1991.
  3. Seppo I.Tiitto. US Patent N 4634976 from Jan. 6,1987. Barkhausen noise method for stress and defect detecting in hard steel.
  4. V.L.Vengrinovich,A.L.Vishnevski,V.N.Busco, On selective evaluation of stresses, residual plastic deformation and metal degradation by magnetic noise method, 14th World conference on NDT, pp. 215-216, New Delhi, India, 1996.

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