OFS-EFPI ultra-fine manometer based on nitrogen-doped MoS2 diaphragm

Here, an extrinsic Fabry-Pérot interferometer-based optical fiber sensor is introduced to assess its dynamic/static response according to the acoustic/gas pressure performance. This sensor utilizes nitrogen-doped molybdenum disulfide (N-MoS₂) and pristine MoS₂ diaphragms. The N-MoS₂ nanosheets are synthesized using the pulse laser ablation in liquid nitrogen. According to empirical results, the N-MoS₂ diaphragm notably enhances the sensitivity of the sensor against the pristine one. Moreover, both diaphragms exhibit a linear relationship between sensor output and acoustic pressure, demonstrating a nearly flat acoustic frequency response ranging 8 Hz-10 kHz. Regarding the pressure measurements, the spectral sensitivity of the N-MoS₂ diaphragm is ∼16 % larger than that of pristine. This sensor is capable of measuring the manometric pressures up to 250 mbar with an accuracy of 0.001 mbar.