Relative humidity sensor based on U-shaped microfiber interferometer coated with MoS2 films

A high-sensitivity optical fiber relative humidity (RH) sensing probe consisting of a U-shaped microfiber interference coated with molybdenum disulfide (MoS2) films proposed and experimentally demonstrated. The film thickness is studied to enhance sensor performance of the refractive index (RI) sensitivity in the immerse-coating method. The experimental results show that the greater the film thickness, the higher the RH sensitivity. We can selectively use the microfiber coated with MoS2 materials of different thicknesses for RH monitoring according to the actual RH environment.

Automated summary

This study presents a high-sensitivity optical fiber relative humidity (RH) sensing probe using a U-shaped microfiber coated with molybdenum disulfide (MoS2) films. The experimental results demonstrate that the thickness of the film directly impacts the RH sensitivity of the sensor. By selectively choosing microfibers coated with MoS2 materials of varying thicknesses, the sensor can be optimized for monitoring RH levels in different environments.