“…This method is susceptible to external factors during the measurement process, leading to weak application adaptability [ 15 , 16 ]. Phase demodulation commonly has a strong anti-interference capability, and many different methods have been developed, including the Fourier-transform method [ 16 , 17 , 18 , 19 ], peak tracking method [ 20 , 21 , 22 , 23 ], cross-correlation method [ 24 , 25 , 26 , 27 , 28 , 29 ], and so on. The Fourier-transform method is a demodulation method based on analyzing the reflection or transmission spectrum of a fiber-optic F–P sensor, which commonly requires a broadband source or a wideband tunable laser.…”