Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

Alexandre Semerok

Hicham Maskrot

Pierre-Yves Thro

Patrick Mauchien

Francois Brygo

Sergey Fomichev

Nadine Andre

A non-destructive method for characterizing and monitoring the homogeneity of metal parts which are being manufactured by sintering and comprise several distinct zones. Laser radiation is applied successively to each zone and each sintered zone is analyzed simultaneously in real time by lock-in laser-active radiometry.

Method for characterising and monitoring the homogeneity of metal parts manufactured by laser sintering

The present invention relates to a method for characterizing a material using active pyrometry. The material comprises at least one thin surface layer arranged on a thick substrate. The present invention heats the surface (Z) of the material by exposing the material to high-frequency laser pulses, so as to perform a series of temperature increase/decrease thermal cycles, accompanied by a heat build-up from one cycle to the next. The present invention collects the emitted radiation, acquires and processes the signals measured by comparing the measured values to the theoretical values obtained by modelling, so as to obtain thermo-physical properties for characterizing the material. The present invention also relates to a device for implementing the method comprising a high-frequency pulsed laser used as heat source.

Method and device for characterizing, using active pyrometry, a thin-layer material arranged on a substrate

A process for simultaneously blowing a gas jet onto a sample 6 to be analyzed and subsequently focusing a laser beam 4 onto the sample so as to produce a plasma 12 on the surface of the sample. An analysis is made of the spectrum S' of the light radiation emitted by the plasma and this spectrum analysis provides the basis for determining the composition of the isotopic composition of the sample.

Process for elementary analysis by optical emission spectrometry on

Growing community of inventors

Palaiseau, France

Alexandre Semerok