A fibre-optic thermometric sensor based on the thermo-optic effect of titanium dioxide coatings

• Published in: Optics and laser technology Vol. 29; no. 3; pp. 121 - 124
• Main Authors: Inci, M.Naci, Barton, J.S., Jones, J.D.C.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1997; Elsevier Science
• Subjects: Exact sciences and technology; fibre-optics; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Physics; sensors; Thermal instruments, apparatus and techniques; Thermometry; titanium; fibre-optics; titanium; sensors; Thin films; Optical fibers; Titanium oxides; Thermometers; Experimental study; Thermo-optical effects
• ISSN: 0030-3992; 1879-2545
• DOI: 10.1016/S0030-3992(96)00055-2

An experimental determination of the thermo-optic effect of titanium dioxide is described in which the test element is a thin film deposited onto the end face of an optical fibre. The film acts as an etalon. The reflectivity of titanium dioxide films was measured as a function of temperature experimentally over the range 20 °C to 500 °C, and modelled theoretically to yield a value of the thermo-optic coefficient of − 1.49 × 10 −4 K −1. The use of the data in the design of a thin-film optical fibre temperature sensor is described.