A relative humidity sensor based on two polarization maintaining fibers (PMFs) Sagnac interferometer with temperature compensation is presented by utilizing polyvinyl alcohol (PVA) as the sensitive cladding film. The proposed sensor is created through coating a thin layer of PVA onto a PMF from which a portion of the cladding is etched. PVA-coated PMF is for air relative humidity measurement and the other section PMF is for temperature compensation. The results show that the dip wavelength of the transmission spectrum shifts with the relative humidity with a high sensitivity of 111.5 pm/%RH. Meanwhile the sensor is insensitive to environmental temperature change with thermal-dependent coefficient of 7.2 pm/ C.ABSTRACT: Miniature and multiband internal antenna systems are strongly required in emergent multifunction wireless devices. Recent techniques are focused on properly exciting ground plane radiation modes through nonresonant elements. These solutions remove the need of including quarter-wavelength resonant antennas featured by a Figure 6 Resonant wavelength as a function of RH for increasing and decreasing cycles. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com]
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