Tungsten disulfide (WS2) based all fiber optic humidity sensor.
We demonstrate a novel all fiber optic humidity sensor comprised of a WS2 film overlay on a side polished fiber (SPF) This sensor can achieve optical power variation of up to 6 dB in a relative humidity (RH) range of 35% 85% In particular, this novel humidity fiber sensor has a linear correlation coefficient of 99.39% sensitivity of 0.1213 dB/%RH, and a humidity resolution of 0.475%RH. Furthermore, this sensor shows good repeatability and reversibility, and fast response to breath stimulus. This WS2 based all fiber optic humidity sensor is easy to fabricate, is compatible with pre established fiber optic systems, and holds great potential in photonics applications such as in all fiber optic humidity sensing networks.
Optics express