Bichromatic melt pool thermal measurement based on a Red, Green, and Blue camera: Application to additive manufacturing processes - Archive ouverte HAL Access content directly
Journal Articles Optics and Laser Technology Year : 2023

Bichromatic melt pool thermal measurement based on a Red, Green, and Blue camera: Application to additive manufacturing processes

Nicolas Béraud

Abstract

The measure of temperature fields during additive manufacturing processes usually requires bulky expansive equipment such as infrared cameras. The full field sensor introduced in this paper is very compact and made with a single red, green and blue camera. Based on a dual-wavelength radiometric model, it is designed to measure temperatures ranging from 1000 to 2500 K. With its dynamic exposure time feature, it rearranges multiple pictures in a median one to observe phenomena with high thermal gradients. The precision of the measures is ensured by calibration on a black body and a tungsten ribbon lamp. The method is applied to wire arc additive manufacturing and laser metal deposition with powder, and accurate measurement of the thermal gradients in the melt pool and the surrounding solid phase is achieved. The good resolution of the camera gives an accurate insight of the melt pool shape and size.
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Dates and versions

hal-04209790 , version 1 (18-09-2023)

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Loïc Jegou, Joel Lachambre, Nicolas Tardif, Mady Guillemot, Anthony Dellarre, et al.. Bichromatic melt pool thermal measurement based on a Red, Green, and Blue camera: Application to additive manufacturing processes. Optics and Laser Technology, 2023, 167, pp.109799. ⟨10.1016/j.optlastec.2023.109799⟩. ⟨hal-04209790⟩
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