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(a) Schematic of the sensor structure. SMF end-face and diaphragm represent the Fabry–Pérot cavity. (b) Interference signal is generated by the reflected signal at the fiber end (light intensity I1) and diamond membrane (light intensity I2). The cavity length d depends on the pressure difference ΔP on the two membrane surfaces, creating a displacement Δd from the position when the same ambient pressure is applied.
