Dedicated to Prof. H. Janeschitz-Kriegl on the occasion of his 65th birthday.
A new method to measure temperatures in polymer melts using heusler alloys†
Article first published online: 9 MAR 2003
Copyright © 1989 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 38, Issue 9, pages 1739–1743, 5 November 1989
How to Cite
Sobczak, R. and Hermann, W. (1989), A new method to measure temperatures in polymer melts using heusler alloys. J. Appl. Polym. Sci., 38: 1739–1743. doi: 10.1002/app.1989.070380912
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Accepted: 6 JAN 1989
- Manuscript Received: 15 DEC 1988
With the help of ferromagnetic Heusler alloys, which are mixed in powdery form into a cylindrical polymer sample surrounded by an induction coil, temperature can be measured. Some 10 K below the Curie temperature small temperature changes already yield considerable signals in the induction coil via the temperature dependence of the permeability of the alloy. From the tremendous variety of Heusler alloys avaialable for each temperature region of interest the proper material can be chosen. The amount of sample needed is small enough to leave the rheological properties of the melt unchanged. Measurements do not involve touching the sample and follow each temperature change more or less simultaneously since the grains of the alloys are very small and have very small heat capacities only.