Optical Diffraction Corrections in Radiometric Thermodynamic Temperature Determination |
| |
Authors: | S Briaudeau B Rougié M Sadli A Richard J M Coutin |
| |
Affiliation: | (1) Institut National de Métrologie-Laboratoire National d’Essais, Conservatoire National des Arts et Métiers (INM-LNE/CNAM), 61 rue du Landy, 93210 La Plaine Saint Denis, France |
| |
Abstract: | One of the main components of uncertainty in high-temperature thermometry arises because of the size-of-source effect (SSE).
This effect makes the temperature measurement sensitive to the geometry of the radiating environment. It is caused by optical
diffraction and especially by light scattering off/from, and inter-reflections between, optical components inside the pyrometer.
The LNE-INM/CNAM is involved in extending the thermometry temperature scale to very high temperatures (T > 2000 °C) and has developed eutectic-based fixed points (Sadli et al. (in: Zvizdic (ed.) Proceedings of TEMPMEKO 2004, 9th
International Symposium on Temperature and Thermal Measurements in Industry and Science, 2004)) and a thermodynamic temperature
measurement capability based on absolute radiometric methods (Briaudeau et al. (in: D. Zvizdic (ed.) Proceedings of TEMPMEKO
2004, 9th International Symposium on Temperature and Thermal Measurements in Industry and Science 2004)). A new measurement
technique that uses an optical fiber has been developed and tested, allowing the determination of the SSE at any defocusing
plane, with high resolution. A model based on optical diffraction has been developed to simulate the SSE in a real situation,
considering the contribution to the pyrometer signal of the whole “3D” optical scene inside the blackbody furnace. Using the
same approach, it has been demonstrated that optical scattering in a simple radiance meter can be estimated from accurate
optical diffraction measurement. |
| |
Keywords: | Blackbody Diffraction High temperature ITS-90 Optical fiber Radiance Radiometry Size-of-source effect Thermometry Thermodynamic temperature |
本文献已被 SpringerLink 等数据库收录! |
|