The working principle of the FBG strain sensor using laser diode (λ = 1551.9 – 1553 nm) as a light source is reported.
Experimental results show that by straining the bare uniform FBG (λB = 1552 nm) for every 0.01 mm in room
temperature, the transmitted and refelcted power were varied according to the state of FBG strains.
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