Article information:To cite this document: M. McSherry, C. Fitzpatrick, E. Lewis, (2005),"Review of luminescent based fibre optic temperature sensors", Sensor Review, Vol. 25 Iss: 1 pp. 56 -62 Permanent link to this document: http://dx.
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AbstractPurpose -There are various temperature measuring systems presented in the literature and on the market today. Over the past number of years a range of luminescent-based optical fibre sensors have been reported and developed which include fluorescence and optical scattering. These temperature sensors incorporate materials that emit wavelength shifted light when excited by an optical source. The majority of commercially available systems are based on fluorescent properties. Design/methodology/approach -Many published journal articles and conference papers were investigated and existing temperature sensors in the market were examined. Findings -In optical thermometry, the light is used to carry temperature information. In many cases optical fibres are used to transmit and receive this light. Optical fibres are immune to electromagnetic interference and are small in size, which allows them to make very localized measurements. A temperature sensitive material forms a sensor and the subsequent optical data are transmitted via optical fibres to electronic detection systems. Two keys areas were investigated namely fluorescence based temperature sensors and temperature sensors involving optical scattering. Originality/value -An overview of optical fibre temperature sensors based on luminescence is presented. This review provides a summary of optical temperature sensors, old and new which exist in today's world of sensing.
An extrinsic optical fibre temperature sensor has been investigated and results are presented. A coating consists of a combination of two inorganic phosphors. Thermal quenching dominates the luminescent characteristics of one phosphor at temperatures in the range of interest while the other more stable phosphor is used as a reference. Ratios of their peak emission intensities are calculated and analysed. The phosphor mixture is coated onto a Pyrex beaker. Boiling water is poured into beaker and the ratio is calculated as the temperature of the water decreases from 8OC to 3OC. Results show an increasing ratio for decreasing temperature. This paper describes the testing of the coating and its application, as part of a temperature sensor, for monitoring surface temperatures in electromagnetically harsh industrial environments.
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