Magnetic Measurement Techniques

2001 ◽  
pp. 225-242
Author(s):  
Henryk Szymczak ◽  
Rita Szymczak
Keyword(s):  
Magnetic Measurement ◽  
Measurement Techniques

Magnetic Measurement Techniques for Locating Foreign Bodies in Humans

Biomag 96 ◽  
2000 ◽  
pp. 28-31
Author(s):  
E. Costa Monteiro ◽  
C. Kelber ◽  
E. Andrade Lima ◽  
P. Costa Ribeiro ◽  
A. C. Bruno ◽  
...  
Keyword(s):  
Foreign Bodies ◽  
Magnetic Measurement ◽  
Measurement Techniques

Magnetic Methods for the Identification of Incorrect Microstructures in Grade 91 Power Station Steels

2021 ◽  
Author(s):  
John W. Wilson ◽  
Anthony J. Peyton
Keyword(s):  
Data Storage ◽  
Elevated Temperatures ◽  
Magnetic Measurement ◽  
Measurement Techniques ◽  
Surface Preparation ◽  
Digital Data ◽  
Hardness Testing ◽  
Martensitic Microstructure ◽  
Grade 91 ◽  
The University

Abstract Grade 91 steels have been used in power generation for more than 20 years in high temperature, high pressure applications such as steam piping, headers and tubing because it provides superior creep and oxidation resistance at elevated temperatures. The mechanical properties of the material are dependent on the creation of a martensitic microstructure, however incorrect heat treatment during manufacture, installation or repair can result in a weak ferritic or semi-ferritic microstructure which can cause premature component failure. Currently, components with incorrect, weak microstructures are identified using hardness testing; a manual technique which is prone to error. This work details a series of tests carried out at the University of Manchester to assess the suitability of multi-parameter magnetic testing for the identification of incorrect microstructures. The tests stem from a workshop organized by the Electric Power Research Institute (EPRI) where three sets of samples (eight pipe sections, eight tube sections and eight unidentified tube sections) with different microstructures were circulated world-wide. The results of the work show that the magnetic measurement techniques employed in these tests have the potential to provide a basis for the development of a portable NDE system for the identification of incorrect microstructures in Grade 91 plant components. The developed system would enable fast scanning of components with very little surface preparation along with digital data storage, improving on current manual hardness testing.

Quench position reconstruction through harmonic field analysis in superconducting magnets

2021 ◽  
Author(s):  
Samuele Mariotto ◽  
Massimo Sorbi
Keyword(s):  
Superconducting Magnets ◽  
Magnetic Measurement ◽  
Measurement Techniques ◽  
Field Analysis ◽  
Particle Accelerators ◽  
Resistive State ◽  
Harmonic Field ◽  
Zero Current ◽  
Superconducting Coils ◽  
Field Quality

Abstract The performances of superconducting magnets for particle accelerators are limited by instabilities or disturbances which lead to the transition of the superconducting material to the normal resistive state and the activation of the quench protection system to prevent damage to the magnet. To locate the position of the state transition, voltage taps or quench antenna are the most commonly used technologies for their reliability and accuracy. However, during the production phase of a magnet, the number of voltage taps is commonly reduced to simplify the construction process, and quench antennae are generally used only for dipoles or quadrupoles to limit the antenna design complexity. To increase the accuracy in the reconstruction of the quench event position, a novel method, suitable for magnets with independent superconducting coils and quench protected without the use of quench heaters is proposed in this paper. This method, based on standard magnetic measurement techniques for field harmonic analysis, can locate the position of the superconductor transition inside the magnet after the quench event when the magnet has been discharged. Analyzing the not allowed harmonics produced in the field quality at zero current, the position of the quenched coils can be retrieved for any magnet orders without increasing the complexity of the dedicated measurement technique.

Monitoring fatigue damage in materials using magnetic measurement techniques

1999 ◽  
Vol 85 (8) ◽  
pp. 4595-4597 ◽  
Author(s):  
C. C. H. Lo ◽  
F. Tang ◽  
Y. Shi ◽  
D. C. Jiles ◽  
S. B. Biner
Keyword(s):  
Fatigue Damage ◽  
Magnetic Measurement ◽  
Measurement Techniques

Special Magnetic Measurement Techniques

1967 ◽  
Vol 38 (3) ◽  
pp. 1510-1519 ◽  
Author(s):  
Simon Foner
Keyword(s):  
Magnetic Measurement ◽  
Measurement Techniques

Magnetic Measurement Techniques for the Large-Scale Production of Undulator Segments for the European XFEL

2015 ◽  
Vol 28 (3) ◽  
pp. 23-28 ◽  
Author(s):  
Y. Li ◽  
S. Abeghyan ◽  
K. Berndgen ◽  
M. Baha-Shanjani ◽  
G. Deron ◽  
...  
Keyword(s):  
Large Scale ◽  
Magnetic Measurement ◽  
Measurement Techniques ◽  
Scale Production ◽  
Large Scale Production

Macroscopic Magnetic Measurements on Microscopic Quantities of Materials

1997 ◽  
Vol 475 ◽  
Author(s):  
Simon Foner
Keyword(s):  
Thin Films ◽  
Magnetic Measurements ◽  
Magnetic Measurement ◽  
Measurement Techniques ◽  
Squid Magnetometer ◽  
Vibrating Sample Magnetometer ◽  
Small Particles ◽  
Controlled Systems ◽  
Magnetic Ions ◽  
Computer Controlled

ABSTRACTThe principles of several of the most popular macroscopic magnetic measurement techniques are discussed for the vibrating sample magnetometer, SQUID magnetometer, ac susceptometer, ac force magnetometer, and torque magnetometers. These types of instruments are available commercially as stand-alone computer-controlled systems, Selected examples of recent measurements on thin films, small particles, and clusters of magnetic ions are presented.

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