Which fringe-pattern change signals increased compressive load within concrete?

A)Increased fringe visibility decline rate

B)Decreased wavelength-shift of spectral components

C)Increased fringe density progression rate✓

D)Decreased pattern symmetry irregularity amount

💡 Explanation

Increased compressive load increases concrete's refractive index. Because this changes the effective optical path length within a fiber-optic sensor embedded in the concrete, the **interference** fringe density increases; therefore compression raises fringe spatial frequency progression, rather than visibility or symmetry changes.

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Which fringe-pattern change signals increased compressive load within concrete?

💡 Explanation

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