Consideration of the Effects of Air Temperature on Structural Health Monitoring through Traffic Light-Based Decision-Making Tools

Figure 3

Frequency (black) and temperature (red) variations recorded at the OT. (a) Raw data, (b) seasonal variations after applying a low-pass filter (48 hours), and (c) daily variations over one week of frequency and temperature normalized to overlap the two curves. Gray zones correspond to a gap in the continuity of the data.

(a)

(b)

(c)