THERMO OPTICAL CONTROL OF FOCUS POSITION OF AN ENERGY BEAM IN AN ADDITIVE MANUFACTURING APPARATUS

A control system for thermo optical control of focus position of an energy beam in an additive manufacturing apparatus has a first doped medium and a second doped medium, each of which is optically transparent and doped with a dopant. The first doped medium has a positive thermo-optical coefficient...

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Bibliographische Detailangaben
Hauptverfasser:	NAIDOO, Darryl, STRAUSS, Hencharl
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ADDITIVE MANUFACTURING TECHNOLOGY ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING BASIC ELECTRIC ELEMENTS CASTING DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DEVICES USING STIMULATED EMISSION ELECTRICITY FREQUENCY-CHANGING MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PERFORMING OPERATIONS PHYSICS POWDER METALLURGY SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TRANSPORTING WORKING METALLIC POWDER WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A control system for thermo optical control of focus position of an energy beam in an additive manufacturing apparatus has a first doped medium and a second doped medium, each of which is optically transparent and doped with a dopant. The first doped medium has a positive thermo-optical coefficient (dn/dT) and the second doped medium has a negative thermo-optical coefficient (dn/dT) and is in series with the first doped medium. An energy beam input or coupling is configured to generate or receive an energy beam that is required to be controlled, the energy beam being within a first wavelength range and directed towards the first and second doped mediums. An absorbed beam input or coupling is configured to generate or receive at least one absorbed beam in a second wavelength range which is different from the first wavelength range, the absorbed beam being directed towards the first and second doped mediums. The first and second doped mediums have a higher beam absorption characteristic in the second wavelength range than in the first wavelength range, causing the absorbed beam to have a higher absorption than the energy beam in the first and second doped mediums and the first and second doped mediums each have a coating which allows transmission at both the first and the second wavelength ranges. L'invention concerne un système de commande pour la commande thermo-optique de la position de focalisation d'un faisceau d'énergie dans un appareil de fabrication additive comprenant un premier milieu dopé et un second milieu dopé, chacun d'entre eux étant optiquement transparent et dopé au moyen d'un dopant. Le premier milieu dopé présente un coefficient thermo-optique positif (dn/dT) et le second milieu dopé présente un coefficient thermo-optique négatif (dn/dT) et est en série avec le premier milieu dopé. Une entrée ou un couplage de faisceau d'énergie est conçu pour générer ou recevoir un faisceau d'énergie qui doit être commandé, le faisceau d'énergie se trouvant dans une première plage de longueurs d'onde et étant dirigé vers les premier et second milieux dopés. Une entrée ou un couplage de faisceau absorbé est conçu pour générer ou recevoir au moins un faisceau absorbé dans une seconde plage de longueurs d'onde qui est différente de la première plage de longueurs d'onde, le faisceau absorbé étant dirigé vers les premier et second milieux dopés. Les premier et second milieux dopés ont une caractéristique d'absorption de faisceau supérieure dans la seconde pla