New Facilities for the Measurements of High-Temperature Thermophysical Properties at LNE

Survey of emissivity measurement by radiometric methods

“…A laboratory blackbody [1,[4][5][6][7][12][13][14][15][16][17] (commercial or developed in-house), or possibly some other source of radiation with a known high spectral normal emissivity [5,18], should be used as the reference body. The radiance of the reference body is detected either at the same time as the surface radiance of the real body at the same temperature, or the reference body is employed as a calibration source of radiation for the calibration of the detection system.…”

“…Direct radiometric methods enable the measurement of directional spectral emissivity [1][2][3]5,7,14,15] or hemispherical spectral emissivity [19,20], in a wide or narrow wavelength range, and directional total [18,21] and directional band [22][23][24][25] emissivity. Directional emissivity is determined under the fixed or variable angle.…”

“…A number of direct radiometric methods [1][2][3][4][5][6][7] have been developed for the measurement of directional spectral emissivity. The methods differ in basic arrangement, reference sources, systems of sample clamping and heating, sample surface temperature measurement, and detection systems, as well as in the emissivity evaluation methods.…”

Apparatus for measuring the emittance of materials from far infrared to visible wavelengths in extreme conditions of temperature

“…In the geosciences field, emittance spectra are also unavoidable data to be able to understand heat transfer and transformation occurring in the earth mantle [3,4]. Several devices [5][6][7][8][9][10][11][12][13][14] have been already published around this subject but most of them are limited to the characterization of the emissivity of opaque materials in restricted spectral ranges. In this paper the technical details of an experimental apparatus designed to measure the emittance spectra of opaque and semi transparent materials in the whole spectral range where thermal emission is produced (i.e.…”

Metrology for New Generation Nuclear Power Plants–MetroFission

“…4 presents a scheme of the lamp image furnace designed to heat the specimens up to 1500 in the new high temperature emissometer of LNE. More information about the equipment developed in the framework of this project by PTB and LNE can be found in [18] and [19]. These apparatuses have been validated in their operating temperature ranges by measuring emissivity and thermal diffusivity of two homogeneous materials (tungsten and graphite) [20].…”