Phosphor Thermometry for In-Cylinder Surface Temperature Measurements in Diesel Engines

Surface temperature measurements in technically relevant applications can be very  hallenging and yet of great importance. Phosphor thermometry is a temperature measurement technique that has previously been employed in technically relevant applications to obtain surface temperature. The technique i...

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Bibliographic Details
Published in:Measurement science & technology 2019
Main Authors: Binder, Christian, Henrik, Feuk, Richter, Mattias
Format: Article
Language:English
Subjects:
diesel engine
Energiteknik
Energy Technology
Farkostteknik
Fysik
phosphor
phosphor thermometry
Physics
temperature measurement
Vehicle and Maritime Engineering
Online Access:Get full text
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Summary:Surface temperature measurements in technically relevant applications can be very  hallenging and yet of great importance. Phosphor thermometry is a temperature measurement technique that has previously been employed in technically relevant applications to obtain surface temperature. The technique is based on temperature-dependent changes in a phosphor’s luminescence. To improve the accuracy and precision of temperature measurements with this technique, the present study considers, by way of example, the impact of conditions inside the cylinder of a diesel engine on decay time based phosphor thermometry. After an initial, general assessment of the effect of prevailing measurement conditions, this research investigates errors caused by soot luminosity, extinction, signal trapping and changes of phosphors’ luminescence properties due to exposure to the harsh environment. Furthermore, preferable properties of phosphors which are suitable for in-cylinder temperature measurements are discussed. 16 phosphors are evaluated, including four which – to the authors’ knowledge –have previously not been used in thermometry. Results indicate that errors due to photocathode bleaching, extinction, signal trapping and changes of luminescence properties may cause an erroneous temperature evaluation with temperature errors in the order of serval tens of Kelvin.
ISSN:1361-6501
0957-0233