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Radiation thermometry based on photonic crystal fibre.

Levick, A P; Piachaud, T*; de Podesta, M (2011) Radiation thermometry based on photonic crystal fibre. Int. J. Thermophysics, 32 (1-2). pp. 372-382.

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Fibre-coupled radiometry allows for the radiometric measurement of high temperatures in environments where there is no line of sight to the target. However transmission through conventional silica optical fibres typically degrade rapidly at elevated temperatures, and exotic fibres - such as sapphire fibres - typically cannot be bent. As part of a project to investigate the performance of solid-oxide fuel cells, we tested the feasibility of using an alternative fibre: solid-core silica photonic crystal (PCF) fibre.

Our test system used an Inconel blackbody as a source, and a detection system based on an InGaAs array spectrometer with a wavelength range of 907 to 1681 nm. The temperature was determined from the spectrometer signal at particular wavelengths using the Planck relationship. Two tests were performed:
(1) Long term high temperature soak-tests to measure drift and noise in thermal radiation levels, in which spectra are sequentially recorded over a long period of time with the blackbody cavity at a constant temperature.
(2) Temperature dependence tests, whereby thermal radiation spectra are recorded with the blackbody cavity at several temperatures.

At 934 °C, the transmission of the PCF fibre decreased at a rate of 0.078% per hour corresponding to a temperature error of -0.12 °C per hour. The transmission of conventional silica fibre decreased at a rate of 0.5% per hour corresponding to a temperature error of -0.8 °C per hour. While the PCF fibre represents a significant improvement over conventional fibre, it is still not good enough for most practical purposes. At 600 °C there was no observable decline in transmission and there may be applications for PCF fibre in that regime.

Item Type: Article
Keywords: high temperatures, photonic crystal fibre, fibre-coupled radiation thermometry, solid oxide fuel cells
Subjects: Engineering Measurements
Engineering Measurements > Thermal
Identification number/DOI: 10.1007/s10765-011-0940-z
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/4950

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