Fig. 10

The first four subplots in Part (a,b) illustrate the optimal correlation coefficients for measurements from paths 5-1, 5-2, 5-3, 5-4, 6-1, 6-2, 6-3, and 6-4. The corresponding measured temperature and humidity are shown in the fifth and sixth subplots. The shadow regions in part (a) and part (b) indicates that the measurements collected from healthy structure to the structure with damage D1, and to damage D2, respectively.