Development of SQUID-based system for nondestructive evaluation

作者：Nagendran R^*; Janawadkar A P; Pattabiraman A; Baisnab Dipak Kumar; Jayapandian J; Baskaran R; Vaidhyanathan L S; Hariharan Y; Nagesha A; Valsan A; Rao K Bhanu Sankara; Raj Baldev

来源：IEEE Transactions on Applied Superconductivity, 2007, 17(3): 3824-3829.

DOI：10.1109/TASC.2007.902112

• eddy current testing
• fatigue
• nondestructive evaluation
• superconducting quantum interference device (SQUID)
• weldment

This article describes the development of a superconducting quantum interference device (SQUID)-based system for nondestructive evaluation. The setup incorporates an in-house developed thin-film-based Nb SQUID with readout flux locked loop electronics and consists of a liquid helium cryostat with adjustable stand-off distance, a precision XY - theta scanner for studying both flat and cylindrical samples, and a data acquisition system. The system has been used for the detection of artificially engineered subsurface defects in aluminum plates and to track magnetic-to-nonmagnetic phase transformation in stainless steel [grade 316L(N)] weldment specimens subjected to low cycle fatigue deformation.

• 出版日期2007-9