SYSTEM AND METHOD FOR MONITORING A COMPONENT

Description

         ∆ 𝜆 𝐾 𝑇 𝛥 ⎧ 𝑇 𝜆 0 1 ⎪ ⎪ ∆ 𝜆 2 2 𝐾 𝛥 𝑇 𝐾 𝑅 𝐻 𝛥 𝑇 𝑅 𝐻 𝜆 ⎨ 0 2 ⎪ ∆ 𝜆 ⎪ 3 3 3 𝐾 𝛥 𝑇 𝐾 𝑅 𝐻 𝛥 𝐾 𝜀 𝑚 𝑚 𝑇 𝑅 𝐻 ⎩ 𝜆 0 3 ∆ 𝜆 𝜆 − 𝜆  𝑖 𝑖 0 𝑖 𝑖 𝐾 𝑋    𝜆 0 𝑖  𝜆 − 𝜆 1 0 1 𝑇 𝛥 𝜆 𝐾 𝑇 0 1 𝐾 ( 𝜉 𝛼 ) 𝑇 𝑔 𝛼 𝜉 𝑔  𝜆 − 𝜆 2 0 2 𝑅 𝐻 𝛥 [ − 𝐾 𝑇 𝛥 ] 𝑇 𝜆 𝐾 0 2 𝑅 𝐻 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝐾 𝑝 − 𝑝 𝛼 𝜉 𝑇 𝑒 𝑒 𝑔 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝐴 𝐸 𝛽 𝑐 𝑐 𝑐 𝐾 𝑝 𝑅 𝐻 𝑒 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝛼 𝑐 𝛽 𝑝 𝑐 𝑒 𝐴 𝐴 𝑐 𝑔 𝐸 𝐸 𝑐 𝑔  𝜆 − 𝜆 3 0 3 3 3 𝜀 [ − 𝐾 𝑇 𝛥 − 𝐾 𝑅 𝐻 𝛥 ] 𝑚 𝑇 𝑅 𝐻 𝐾 𝜆 0 3 𝑚 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝐾 𝑝 − 𝑝 𝛼 𝜉 𝑇 𝑒 𝑒 𝑔 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝐴 𝐸 𝛽 𝐴 𝐸 𝛽 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝐾 𝑝 𝑅 𝐻 𝑒 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝐾 − 𝑝 𝑚 𝑒 𝛼 𝛽 𝑟 𝑟 𝐴 𝐸 𝑟 𝑟  4 γ cos θ r         𝜆 𝑛 Λ 𝐵 𝑒 𝑓 𝑓   𝜕 𝑛 𝜕 𝜆 𝛬 𝜕 𝐵 𝑒 𝑓 𝑓 𝛬 𝑛 𝑒 𝑓 𝑓 𝜕 𝑋 𝜕 𝑋 𝑋 𝜕 Δ 𝜆 𝜕 𝑛 𝜕 𝛬 𝑒 𝑓 𝑓 D 𝑋 D 𝑋 𝜆 𝑋 𝜕 𝑛 𝜕 𝑋 Λ 𝐵 𝑒 𝑓 𝑓        D 𝜆 𝜉 Δ 𝑇 𝛼 Δ 𝑇 𝑔 𝜆 B 𝜕 𝑛 𝑒 𝑓 𝑓 𝜉 𝜕 𝑇 𝑛 𝑒 𝑓 𝑓 𝛬 𝜕 𝛼 𝑔 𝑇 𝜕 𝜛 𝜉  𝐾 𝑇 𝐾 𝛼 𝜉 𝑔 𝑇 D 𝜆 𝜀 𝛥 𝜉 𝑇 − 𝑝 𝜀 𝜀 𝑜 𝑡 𝑡 𝑒 𝑠 𝑟 𝑒 𝑚 𝜆 B 𝜀 𝑡 𝑜 𝑡 𝜉 Δ 𝑇 − 𝑝 𝜀 𝜀 𝑒 𝑠 𝑒 𝑟 𝑚 𝑝 𝑒 𝜀 𝑒 𝑟 𝑠 𝜀 𝑒 𝑟 𝑠 𝜀 𝑚 𝜀 𝑡 𝑡 𝑜 𝐴 𝑔 𝐸 𝐴 𝑉 ( ) 𝑔 𝑔 𝑔 𝐴 𝑜 𝑡 𝑡 𝐴 𝑐 𝐸 𝐴 𝑉 ( ) 𝑐 𝑐 𝑐 𝐴 𝑜 𝑡 𝑡 𝛼 𝛼 𝑔 𝑐 𝛽 𝜀 𝛽 Δ 𝐻 𝑅 𝑐 𝑅 𝐻 𝑐  𝐴 𝐴 𝐴 𝐸 𝑡 𝑡 𝑜 𝑐 𝑔 𝑜 𝑡 𝑡 𝐹 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛽 Δ 𝑅 𝐻 𝐹 𝑜 𝑡 𝑡 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝑐 𝑐 𝑐 𝑒 𝑡 𝑥 𝐹 𝑒 𝑡 𝑥 𝐸 𝑉 𝐸 𝑉 𝐸 𝑡 𝑜 𝑡 𝑐 𝑐 𝑔 𝑔 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛽 Δ 𝑅 𝐻 𝐹 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝑐 𝑐 𝑐 𝑒 𝑥 𝑡 𝜀 𝑡 𝑜 𝑡 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝜀 𝑟 𝑒 𝑠 𝐴 𝐸 𝛽 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝑐 𝑐 𝑐 𝑐 𝑐 𝑐 𝑔 𝑔 𝑔 𝜀 𝛼 Δ 𝑇 − Δ 𝑅 𝐻 Δ 𝑇 ( ) 𝑠 𝑟 𝑒 𝑔 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑐 𝑐 𝑔 𝑔 𝜎 𝐸 𝜀 𝑟 𝑠 𝑒 𝑔 𝑟 𝑒 𝑠 ( 𝐸 ) 𝜀 𝑔 𝑟 𝑒 𝑠 𝑝 𝑒 Δ 𝜆 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛽 Δ 𝑅 𝐻 𝐹 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝑐 𝑐 𝑐 𝑒 𝑡 𝑥 𝜉 Δ 𝑇 𝜆 𝐴 𝐸 𝐴 𝐸 𝐵 𝑐 𝑐 𝑔 𝑔 𝐴 𝐸 𝛽 𝐴 𝐸 𝛼 + 𝐴 𝐸 𝛼 𝑐 𝑐 𝑐 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 − 𝑝 𝛼 Δ 𝑇 − ( Δ 𝑅 𝐻 Δ 𝑇 ) 𝜀 𝑒 𝑔 𝑚 𝐴 𝐸 + 𝐴 𝐸 𝐴 𝐸 + 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑐 𝑐 𝑔 𝑔 𝐹 𝑔 𝑒 𝑥 𝑡 𝑐 𝜀 𝜀 𝜀 𝑚 𝑚 𝑚 𝐴 𝐸 𝑡 𝑜 𝑡 𝑡 𝑜    D 𝜆 𝜆 B 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 [ 𝑝 − 𝑝 𝛼 𝜉 ] Δ 𝑇 𝑒 𝑒 𝑔 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝐴 𝐸 𝛽 𝑐 𝑐 𝑐 [ 𝑝 ] 𝑅 𝐻 𝛥 𝑒 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 − 𝑝 𝜀 𝑒 𝑚 D 𝜆 2 2 𝐾 𝑇 𝛥 𝐾 𝛥 𝑅 𝐻 𝑇 𝑅 𝐻 𝜆 B 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝐾 𝑝 − 𝑝 𝛼 𝜉 𝑇 𝑒 𝑒 𝑔 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝐴 𝐸 𝛽 𝑐 𝑐 𝑐 𝐾 𝑝 𝑅 𝐻 𝑒 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 2 2 𝐾 𝐾 𝑇 𝑅 𝐻 𝐴 𝑔 𝐸 𝐴 𝑉 ( ) 𝑔 𝑔 𝑔 𝐴 𝑜 𝑡 𝑡 𝐴 𝑐 𝐸 𝐴 𝑉 ( ) 𝑐 𝑐 𝑐 𝐴 𝑜 𝑡 𝑡 𝐴 𝑟 𝐸 𝐴 𝑉 ( ) 𝑟 𝑟 𝑟 𝐴 𝑜 𝑡 𝑡 𝛼 𝛼 𝛼 𝑔 𝑐 𝑟 𝛽 𝛽 𝑐 𝑐 𝜀 𝛽 Δ 𝐻 𝑅 𝑅 𝐻 − 𝑐 𝑐 𝜀 𝛽 Δ 𝑅 𝐻 𝑅 𝐻 − 𝑟 𝑟 𝐴 𝐴 𝐴 𝐴 𝐸 𝑡 𝑡 𝑜 𝑐 𝑔 𝑟 𝑡 𝑜 𝑡 𝐹 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛽 𝐴 𝐸 𝛽 Δ 𝑅 𝐻 𝑡 𝑜 𝑡 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝐹 𝑒 𝑡 𝑥 𝐸 𝑉 𝐸 𝑉 𝐸 𝑉 𝐸 𝑡 𝑜 𝑡 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝜀 𝑡 𝑡 𝑜 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛽 𝐴 𝐸 𝛽 Δ 𝑅 𝐻 𝐹 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝑥 𝑒 𝑡 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝜀 𝑟 𝑒 𝑠 𝐴 𝐸 𝛽 𝐴 𝐸 𝛽 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝜀 𝛼 Δ 𝑇 − ( Δ 𝑅 𝐻 𝑟 𝑠 𝑒 𝑔 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝑐 𝑐 𝑐 𝑔 𝑔 𝑔 𝑟 𝑟 𝑟 D 𝑇 ) 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝜎 𝐸 𝜀 𝑟 𝑠 𝑒 𝑔 𝑟 𝑠 𝑒 𝐸 ( ) 𝑔 𝜀 𝑟 𝑠 𝑒 𝑝 𝑒 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛼 Δ 𝑇 𝐴 𝐸 𝛽 Δ 𝑅 𝐻 𝐴 𝐸 𝛽 Δ 𝑅 𝐻 D 𝜆 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝜆 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝐵 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝐹 𝑥 𝑒 𝑡 𝛥 𝜉 𝑇 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝐴 𝐸 𝛽 + 𝐴 𝐸 𝛽 𝐴 𝐸 𝛼 + 𝐴 𝐸 𝛼 + 𝐴 𝐸 𝛼 𝑐 𝑐 𝑐 𝑔 𝑔 𝑔 𝑟 𝑟 𝑟 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 − 𝑝 𝛼 Δ 𝑇 − ( Δ 𝑅 𝐻 Δ 𝑇 ) 𝜀 𝑒 𝑔 𝑚 𝐴 𝐸 + 𝐴 𝐸 + 𝐴 𝐸 𝐴 𝐸 + 𝐴 𝐸 + 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝐹 𝑔 𝑥 𝑒 𝑡 𝑐 𝑟 𝜀 𝜀 𝜀 𝜀 𝑚 𝑚 𝑚 𝑚 𝐴 𝐸 𝑡 𝑜 𝑡 𝑡 𝑜    D 𝜆 𝜆 B 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 [ 𝑝 − 𝑝 𝛼 𝜉 ] Δ 𝑇 𝑒 𝑒 𝑔 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝐴 𝐸 𝛽 𝐴 𝐸 𝛽 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 [ 𝑝 ] 𝑅 𝐻 𝛥 𝑒 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 − 𝑝 𝜀 𝑒 𝑚 D 𝜆 3 3 3 𝐾 𝑇 𝛥 𝐾 𝑅 𝐻 𝛥 𝐾 𝜀 𝑚 𝑚 𝑇 𝑅 𝐻 𝜆 𝐵 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝐴 𝐸 𝛼 𝑔 𝑔 𝑔 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝐾 𝑝 − 𝑝 𝛼 𝜉 𝑇 𝑒 𝑒 𝑔 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝐴 𝐸 𝛽 𝐴 𝐸 𝛽 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 𝐾 𝑝 𝑅 𝐻 𝑒 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑔 𝑔 𝑟 𝑟 𝐾 − 𝑝 𝑚 𝑒    ∆ 𝜆 𝐾 𝑇 𝛥 ⎧ 𝑇 𝜆 0 1 ⎪ ⎪ ∆ 𝜆 2 2 𝐾 𝛥 𝑇 𝐾 𝑅 𝐻 𝛥 𝑇 𝑅 𝐻 𝜆 ⎨ 0 2 ⎪ ∆ 𝜆 ⎪ 3 3 3 𝐾 𝛥 𝑇 𝐾 𝑅 𝐻 𝛥 𝐾 𝜀 𝑇 𝑅 𝐻 𝑚 𝑚 ⎩ 𝜆 0 3 ∆ 𝜆 𝜆 − 𝜆  𝑖 𝑖 0 𝑖 𝑖 𝐾 𝑋 𝜆 0 𝑖 𝐴 𝑔 𝐸 𝑝 𝜉 𝛼 𝐴 𝐸 𝛼 𝑔 𝑒 𝑔 𝑐 𝑐 𝑐 𝛽 𝐴 𝐸 𝛼 𝛽 𝑐 𝑟 𝑟 𝑟 𝑟         𝜆 − 𝜆 1 0 1 𝑇 𝛥 𝜆 𝐾 0 1 𝑇 𝐾 𝛼 𝜉 𝑔 𝑇 𝜆 𝜆 0 1 𝐾 𝑇 𝛼 𝑔 𝜉 𝛼 𝑔 𝜉  𝜆 − 𝜆 2 0 2 𝑅 𝐻 𝛥 [ − 𝐾 𝑇 𝛥 ] 𝑇 𝐾 𝜆 0 2 𝑅 𝐻 2 2 𝐾 𝐾 𝑇 𝑅 𝐻 𝜆 𝜆 0 2  2 2 𝐾 𝐾 𝑇 𝑅 𝐻 𝛼 𝑐 𝛽 𝑐 𝑝 𝑒 𝐴 𝐴 𝑐 𝑔 𝐸 𝐸 𝑐 𝑔 𝛼 𝑐 𝛽 𝑐 𝑝 𝑒 𝐸 𝑐 𝐸 𝑔 𝐴 𝑐 𝐴 𝑟 𝑔 𝑐 𝑟 𝑔   𝑟 𝑔 𝑟 𝑐 𝐸 𝑔 𝐸 𝑐 𝑝 𝑒 𝜉 𝛼 𝑔 𝛼 𝑐 𝛽 𝑐 1 ∆ 𝑉  3 𝑉 𝐴 𝐸 𝛽 𝐴 𝐸 𝛽 𝑐 𝑐 𝑐 𝑟 𝑟 𝑟 [ 𝑝 ] 𝛥 𝑅 𝐻 𝑒 𝑚 𝐴 𝐸 𝐴 𝐸 𝐴 𝐸 𝑐 𝑐 𝑟 𝑟 𝑔 𝑔 𝑤 𝜌 𝑤 𝑚 − 𝑝 𝜌 0 𝑒 𝑟 𝑚 𝜌 0 𝑤 𝜌 𝑟 𝜆 − 𝜆 3 0 3 3 3 𝜀 [ − 𝐾 𝑇 𝛥 − 𝐾 𝑅 𝐻 𝛥 ] 𝑚 𝑇 𝑅 𝐻 𝐾 𝜆 0 3 𝑚 3 3 3 𝐾 𝐾 𝑒 𝐾 𝑚 𝑇 𝑅 𝐻 𝜆 𝜆 0 3   2 2 3 𝐾 𝐾 𝐾 𝑇 𝑅 𝐻 𝑚 𝛼 𝑟 𝛽 𝑟 𝐴 𝑟 𝐸 𝑟 𝐴 𝑟  𝐴 𝑟 𝐸 𝑟 𝛼 𝑟 𝛽 𝑟 𝐴 𝑟

Claims

1. A system (1 ) for monitoring the operating conditions of a component comprising: - a first sensor (11) comprising a first fibre optic Bragg grating configured to be associated with said component, said first Bragg grating being sensitive to a temperature variation, ΔT, of said component and insensitive to a humidity variation, ARH, and a mechanical deformation, sm, of said component; - a second sensor (12) comprising a second fibre optic Bragg grating configured to be associated with said component, said second Bragg grating being sensitive to said temperature variation, ΔT, and said humidity variation, ARH, and insensitive to said mechanical deformation, sm;and - a third sensor (13) comprising a third fiber optic Bragg grating configured to be associated with said component, said third Bragg grating being sensitive to said temperature variation, ΔT, said humidity variation, ARH, and said mechanical deformation, sm, said system (1) being configured to detect a first Bragg wavelength, a second Bragg wavelength and a third Bragg wavelength of a respective light signal provided by each of said first sensor (11), second sensor (12) and third sensor (13) and to determine the value of said temperature variation, ΔT, said humidity variation, ARH, and said mechanical deformation, sm, starting from said first Bragg wavelength, second Bragg wavelength and third Bragg wavelength.; 2. The system (1) according to claim 1, wherein said first Bragg grating is inscribed in an optical fibre (21) at an uncoated section thereof, and said first sensor (11) further comprises a -40Dr. Ing. Gaia Cevini first rigid tubular element (41) which houses said section of the optical fibre (21), said section of the optical fibre (21) being constrained to said first rigid tubular element (41).

3. The system (1) according to claim 1 or 2, wherein said second Bragg grating is inscribed in an optical fibre (22) at a coated section thereof, and said second sensor (12) further comprises a second rigid tubular element (42) which houses said section of the optical fibre (22), said section of the optical fibre (22) being constrained to said second rigid tubular element (42), wherein the coating of the section of the optical fibre (22) is made of a hygroscopic material, and wherein said rigid tubular element (42) comprises, on one of its side walls, a plurality of through holes.

4. The system (1) according to claim 3, wherein each of said through holes has a cross-section sized such that, when said second sensor (12) is embedded in the material of said component, said material penetrates the hole with a maximum depth equal to the thickness of said side wall of said second tubular rigid element (42).

5. The system (1) according to claim 3 or 4, wherein said second tubular rigid element (42) comprises one or more rows of through holes (51,52,53) arranged along the perimeter of a cross-section of said side wall, wherein the through holes of each row (52, 52, 53) are aligned along a longitudinal direction of said second tubular rigid element (42).

6. The system (1) according to claim 3 or 4, wherein said through holes are arranged randomly or in a checkered pattern on the side wall of said second tubular rigid element (42).

7. The system (1) according to any of claims 2 to 6, wherein each of said first tubular rigid element (41) and second tubular element (42) is made of a metallic material or a polymeric material or a ceramic material. -41 Dr. Ing. Gaia Cevini 8. The system (1) according to any of claims 3 to 6, wherein said second tubular rigid element (42) comprises, around said section of the optical fibre (22), air or another hygroscopic material.

9. The system (1) according to any of the preceding claims, wherein said third Bragg grating is inscribed in an optical fibre (23) at a coated section thereof, wherein the coating of the optical fibre section (23) is made of a hygroscopic material.

10. A method for monitoring the operating conditions of a component, said method comprising: a) detecting a first Bragg wavelength of a light signal reflected from a first Bragg grating included in a first sensor (11) associated with said component, said first sensor (11) being sensitive to a temperature variation, ΔT, of said component and insensitive to a humidity variation, ARH, and to a mechanical deformation, sm, of said component; b) detecting a second Bragg wavelength of a light signal reflected from a second Bragg grating included in a second sensor (12) associated with said component, said second sensor (12) being sensitive to said temperature variation, ΔT, and to said humidity variation, ARH, and insensitive to said mechanical deformation, sm;c) detecting a third Bragg wavelength of a light signal reflected by a third Bragg grating included in a third sensor (13) associated with said component, said third sensor (13) being sensitive to said temperature variation, ΔT, to said humidity variation, ARH, and to said mechanical deformation, sm; d) determining the value of said temperature variation, ΔT, from said first Bragg wavelength; e) determining the value of said humidity variation, ARH, from said second Bragg wavelength and from said value of said temperature variation, ΔT, determined in step d); and -42Dr. Ing. Gaia Cevini f) determining said mechanical deformation, sm, from said third Bragg wavelength, from said value of said temperature variation, ΔT, determined in step d) and from said value of said humidity variation, ARH, determined in step e).;