TY - JOUR
T1 - Nondestructive evaluation of flaws using SQUIDs
AU - Jeng, J. T.
AU - Horng, H. E.
AU - Chen, Chao Hsiang
AU - Chen, J. H.
AU - Yang, H. C.
N1 - Funding Information:
*Supported by the National Science Council of R.O.C under grant No. NSC-89-2112-M-003-012 and No. NSC-89-2112-M-002-029
PY - 2000/11
Y1 - 2000/11
N2 - Using high-Tc SQUIDs, we have designed a nondestructive evaluation system to probe buried flaws. The frequency of the excitation magnetic fields was varied from 10 to 800 Hz and the magnetic fields generated from the eddy current was lock-in detected. The SQUIDs output data revealed the most effective excitation frequencies for the flaws with different depths and widths. The signal-to-noise ratio of the deep flaws can be further enhanced either by using higher excitation fields or using the SQUIDs with higher low-frequency sensitivity.
AB - Using high-Tc SQUIDs, we have designed a nondestructive evaluation system to probe buried flaws. The frequency of the excitation magnetic fields was varied from 10 to 800 Hz and the magnetic fields generated from the eddy current was lock-in detected. The SQUIDs output data revealed the most effective excitation frequencies for the flaws with different depths and widths. The signal-to-noise ratio of the deep flaws can be further enhanced either by using higher excitation fields or using the SQUIDs with higher low-frequency sensitivity.
UR - http://www.scopus.com/inward/record.url?scp=0342961948&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0342961948&partnerID=8YFLogxK
U2 - 10.1016/S0921-4534(00)01430-1
DO - 10.1016/S0921-4534(00)01430-1
M3 - Conference article
AN - SCOPUS:0342961948
VL - 341-348 (IV)
SP - 2637
EP - 2638
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
T2 - International Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI
Y2 - 20 February 2000 through 25 February 2000
ER -