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Abstract

In fusion devices, the surface temperature of plasma facing components is measured using infrared cameras. This method requires a knowledge of the emissivity of the material, the reflected and parasitic fluxes (Bremsstrahlung). For carbon, the emissivity is known and constant over the detection wavelength (approximately 3-5 mu m). For beryllium and tungsten, the reflected flux could contribute significantly to the collected flux. The pulsed photothermal method described in this paper allows temperature measurements independently of both reflected and parasitic fluxes. A local increase of the surface temperature (Delta T approximately 10-15 K) introduced by a laser pulse (few ns) results in an additional component of the photon flux collected by the detector. Few mu s after the pulse, a filtering of the signal allows to extract a temporal flux proportional only to the variation of the emitted flux, the emissivity and Delta T. The ratio of simultaneous measurements at two wavelengths leads to the elimination of Delta T and emissivity. The range of application increases for measurements at short wavelengths (1-1.7 mu m) with no limitation due to the Bremsstrahlung emission.

Additional information

Authors: MOREAU F, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);ROCHE H, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);BRYGO F, CEA Saclay, Gif sur Yvette (FR);LE GUERN F, CEA Saclay, Gif sur Yvette (FR);SEMEROK A, CEA Saclay, Gif sur Yvette (FR);MURARI A, Associazione EURATOM-ENEA per la Fusione, Padova (IT);LOARER TH, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GAUTHIER E, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR);GRISOLIA C, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Journal of Nuclear Materials (2007), online edition
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at: http://www.sciencedirect.com/science/journal/00223115
Record Number: 200718980 / Last updated on: 2007-03-26
Category: PUBLICATION
Original language: en
Available languages: en