バルクハウゼンノイズの応力測定への応用

概要

論文の詳細を見る
A new technique was developed for measuring external stress applied to a steel structure, using three devices: a stress-sensor plate that generates Barkhausen noise(BHN), a non-contact-type magnetic head for detecting the BHN of the plate, and a portable measurement apparatus. The stress-sensor plate is attached to a part of the steel structure with an adhesive, and the RMS values of the BHN are measured on the plate by using the induction search coil of the magnetic head at a maximum lift-off distance of as much as 4mm. The merits of the stress-sensor plate include sufficient stress sensitivity and independence of the measurement temperature. The technique was used to measure a rail axial force, which was mainly induced by thermal stress, and achieved an accuracy of 5 MPa. The convenience of this technique, with its short measurement time and portable apparatus, makes it suitable for practical use.
社団法人日本磁気学会の論文
1998-12-01