This presentation was first given at Tohoku University, then a modified version, with some preliminary results from work done at Tohoku, was given at Kyushu University.
Title page
What is Barkhausen noise? (I)
Barkhausen's original experiment
What is Barkhausen noise? (II)
What is Barkhausen noise? (III)
What is Barkhausen noise? (III)
What is Barkhausen noise? (III)
What is Barkhausen noise? (III)
What is Barkhausen noise? (III)
What is Barkhausen noise? (IV)
Domain Wall Pinning
This is very useful!
Power Plant
But...
Work of Moorthy et al. (I)
Work of Moorthy et al. (II)
Typical signals for plain carbon steels
Peak 1 position versus grain size
Peak 2 position versus carbide size
Scaling relationships
Interpretation of signals
New model
Domain wall mean free path
Obtaining Barkhausen peak height
Functions contributing to model
Two-peak model
Prediction of two-peak behaviour using model
How well does model fit real data? (I)
0.5 hour tempering
1 hour tempering
25 hour tempering
How well does model fit real data? (II)
Improvements
Log-normal expression
Work in progress
Latest results (Japan)
Grain boundary structure change
OIM results
Application to model
Conclusions
References