Development of SQUID-Based System for Nondestructive Evaluation |
| |
| Authors: | Nagendran R. Janawadkar M.P. Pattabiraman M. Jayapandian J. Baskaran R. Vaidhyanathan L.S. Hariharan Y. Nagesha A. Valsan M. Rao K.B.S. Raj B. |
| |
| Affiliation: | Indira Gandhi Centre for Atomic Res., Kalpakkam; |
| |
| Abstract: | 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- thetas 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. |
| |
| Keywords: | |
|
