PSI - Issue 64

S.W. Jacobsz et al. / Procedia Structural Integrity 64 (2024) 1657–1664 SW Jacobsz/ Structural Integrity Procedia 00 (2019) 000 – 000

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-0.006 -0.004 -0.002 0 0.002 0.004 0.006

a

6F-TB

72F-6C-LC

Δ BFS (GHz)

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320

Length (m)

Fig. 5. (a) change in Brillouin Frequency Shift when subtracting the 23 March baseline from the 24 March average; (b) change in Brillouin Frequency Shift when subtracting moving averages of the 23 March baseline from the 24 March average; (c) zeroed change in Brillouin Frequency Shift; (d) squared and zeroed Brillouin Frequency Shift profile. 0.0E+00 5.0E-07 1.0E-06 1.5E-06 2.0E-06 2.5E-06 3.0E-06 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 Δ BFS² (GHz)² Length (m) 72F-6C-LC 6F-TB False Leak d -0.001 -0.0005 0 0.0005 0.001 0.0015 0.002 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 Δ BFS (GHz) Length (m) Raw output 25 pt ave 72F-6C-LC 6F-TB b -0.001 -0.0005 0 0.0005 0.001 0.0015 0.002 0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 Δ BFS (GHz) Length (m) 25 pt ave (not zeroed) 25 pt ave (zeroed) c