Abstract

This Letter presents a miniature fiber-optic sensor created at the tip of an optical fiber suitable for simultaneous measurement of relative humidity and temperature. The proposed sensor is based on two cascaded Fabry–Perot interferometers, the first configured as a relative humidity sensing element made from silica micro-wire coated with thin porous ${\mathrm{SiO}}_2$ layer, and the second as a temperature sensing element made from a segment of a standard single-mode fiber. The sensor has linear characteristics for both measurement parameters and a sensitivity of 0.48 deg/%RH and 3.7 deg/°C.

© 2015 Optical Society of America

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