| Citation: | FENG Di, SUN Junru, WEI Peng, et al. Measurement method of temperature-strain composite signal of turbine rotor in aero-engine based on fiber optic sensing[J]. Journal of Aerospace Power, 2026, 41（4）：20250068 doi: 10.13224/j.cnki.jasp.20250068
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An experimental system was established by integrating fiber Bragg grating sensor strings, high-speed optical slip rings, and fiber Bragg grating signal demodulation algorithms. A wavelet domain signal denoising method based on unbiased risk estimation threshold was proposed to address the interference of various noises in the engine test data and improve the quality of signal processing. A multi-level discrete wavelet transform was proposed to decouple the temperature-strain composite signals from the fiber Bragg grating. The research results showed that the demodulation system can stably collect signals at 17 000 r/min, with the strain and temperature signals successfully separated. The temperature gradually increased from the blade root to the blade tip, with the most significant strain changes occurring at the leading edge of the blade's windward surface.
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