0000000000373082

AUTHOR

N. Coniglio

showing 3 related works from this author

Real time polarization imaging of weld pool surface

2015

The search for an efficient on-line monitoring system focused on the real-time analysis of arc welding quality is an active area of research. The topography and the superficial temperature field of the weld pool can provide important information which can be used to regulate the welding parameters for depositing consistent welds. One difficulty relies on accessing this information despite the bright dazzling welding arc. In the present work, Stokes polarimetry and associated shape-from-polarization methods are applied for the analysis of the weld pool through its 810 nm-wavelength infrared emissions. The obtained information can provide a better understanding of the process, such as the usa…

Materials scienceMatériaux [Sciences de l'ingénieur][SPI.OPTI] Engineering Sciences [physics]/Optics / PhotonicAcousticsPolarimetryReal time imaging02 engineering and technologyWelding01 natural scienceslaw.invention010309 opticsOpticsThree dimensional sensinglaw0103 physical sciencesweld poolTraitement des images [Informatique]business.industryPolarization imagingPolarimetric imagingMonitoring system021001 nanoscience & nanotechnologyPolarization (waves)Stokes polarimetryWeld pool[SPI.OPTI]Engineering Sciences [physics]/Optics / PhotonicArc welding[ SPI.OPTI ] Engineering Sciences [physics]/Optics / Photonic0210 nano-technologybusinessreal time imagingshape from polarizationthermal field
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Weld pool surface temperature measurement from polarization state of thermal emission

2014

This paper presents a passive polarimetry method using a division of aperture optical device in order to measure the temperature distribution at the weld pool surface. Thermal emission from a hot liquid metal was investigated at a near-infrared wavelength corresponding to a blind spectral window of a helium plasma generated during gas tungsten arc welding process. The refractive index of liquid metal and the surface radiance are deduced from the polarisation state of thermal emissions. Based upon the knowledge of both characteristics, the temperature distribution can be calculated. Conseil Régional de Bourgogne

Liquid metalMaterials scienceMatériaux [Sciences de l'ingénieur][ INFO.INFO-TS ] Computer Science [cs]/Signal and Image Processing[SPI.OPTI] Engineering Sciences [physics]/Optics / PhotonicStokes imaging[ SPI.MAT ] Engineering Sciences [physics]/Materials02 engineering and technology01 natural sciencesTemperature measurementTraitement du signal et de l'image [Informatique][SPI.MAT]Engineering Sciences [physics]/Materials010309 opticsOptics[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing0103 physical sciencesThermal[ INFO.INFO-TI ] Computer Science [cs]/Image Processingweld pool temperature[SPI.GPROC]Engineering Sciences [physics]/Chemical and Process EngineeringElectrical and Electronic EngineeringInstrumentationComputingMilieux_MISCELLANEOUSpolarimetrygas tungsten arcTraitement des images [Informatique]business.industryGas tungsten arc welding[ SPI.GPROC ] Engineering Sciences [physics]/Chemical and Process Engineering021001 nanoscience & nanotechnologyWavelengthpolarimetry;[INFO.INFO-TI]Computer Science [cs]/Image Processing [eess.IV]RadianceWeld pool[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic[ SPI.OPTI ] Engineering Sciences [physics]/Optics / Photonic0210 nano-technologybusinessRefractive index
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Characterizing weld pool surfaces from polarization state of thermal emissions

2013

International audience; In this Letter, a vision-based remote sensing methodology is proposed to measure the topography of weld pool surfaces from one single view. Thermal radiations emitted by the hot liquid metal at a wavelength within the arc plasma blind spectral window are acquired by a wavefront division polarimetric system. The refractive index of the liquid metal and the topography of the weld pool surface are inferred from the polarimetric state of the thermal radiations.

WavefrontLiquid metalMaterials sciencebusiness.industry02 engineering and technologyPlasma021001 nanoscience & nanotechnologyPolarization (waves)01 natural sciencesAtomic and Molecular Physics and OpticsPhysics::Geophysics010309 opticsWavelengthOptics0103 physical sciencesThermal[SPI.OPTI]Engineering Sciences [physics]/Optics / PhotonicWeld pool[ SPI.OPTI ] Engineering Sciences [physics]/Optics / Photonic0210 nano-technologybusinessRefractive indexPhysics::Atmospheric and Oceanic PhysicsOptics Letters
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