In this investigation, etched-fibers are coated by 2D layers such as Molybdenum disulfide (MoS2), Molybdenum diselenide (MoSe2) and composition of graphene and graphene oxide (G/GO) to modify humidity sensing. The relative differentiation of attenuations (RDA) in presence of relative humidity (RH) is measured by Optical Loss Test Set at two standard-wavelengths-telecommunication (1310 nm and 1550 nm). Results show that the etched single-mode fiber (ESMF) coated with G/GO has relatively high and one by one function for RDA versus RH (more than 30%). Also, its sensitivity and variance are reasonable. The MoSe2 based sensor is applicable at humidity below 30% because of higher RDA. However, it is not useful at humidity more than 30% due to the absence of one by one function for RDA versus RH. Besides, ESMF coated with MoS2 has indistinctive behavior and is not useful as a humidity sensor.
Humidity sensing based on etched-optical fibers coated with graphene oxide (GO), silica gel (Sg), and a silica gel modified with GO (GSg) was studied. Their humidity sensing behavior was investigated by variation of the relative differentiation of attenuation (RDA) in the presence of relative humidity (RH) by the Optical Loss Test Set. The results show that etched optical fibers coated by Sg and GSg have a high RDA in the presence of RH. Also, GO shows a low RDA value and high variance. However, the pristine Sg needs to take time to recover when saturated with moisture, so it does not have a fast and repeatable response. Results show that modification of a silica gel by GO (GSg) succeeds in solving their defects and makes it capable of humidity sensing usage. Their RDA is relatively high, it has a rapid response, one-to-one correspondence with RH, and it could operate in a wide range of humidity. Additionally, their good repeatability, high sensitivity, and low variance is suggestive of their accuracy.
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