Environmental Engineering Reference
In-Depth Information
Fig. 9.10 Experimental
modal frequencies for both
undamaged and damaged
blades
Fig. 9.11 Novelty Index
from experimental data
the frequency difference of the two laser beams is called the Brillouin gain
spectrum (BGS), which can be obtained by sweeping the frequency of the probe
light. The value of the strain can be estimated by measuring the peak frequency of
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