Plot of the wavelength shift when a bare LPG with a period of 330 μm is exposed to various RI oil. The refractive indices of PVA (circle) and PI (square) are marked.
Experimental setup for the polymer coated LPG sensor probes.
Results for the PI coated LPG RH sensor probe with a linear equation fit applied as the straight line.
Performance features of the PVA coated LPG RH sensor probe. (Inset) A linear equation fit between the RH responses between 40%RH and 85%RH (RH ascending).
Comparison between the performance of PI and PVA coated LPG based RH sensor probes.
Comparison between the responses of PVA and PI and other coated fibre grating based RH sensors.
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