The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform

Fred A Hamprecht - One of the best experts on this subject based on the ideXlab platform.

  • sputter tracking for the automatic monitoring of Industrial Laser welding processes
    IEEE Transactions on Industrial Electronics, 2008
    Co-Authors: M Jager, S Humbert, Fred A Hamprecht
    Abstract:

    The importance of Laser welding in industry increases. Many welds have high-quality demands, and one possibility to satisfy the quality requirements is to monitor the welding process with high-speed cameras. Laser welding is a highly dynamic process; it is therefore challenging to distinguish between normal process fluctuations and abnormal error events in the recorded sequences. This paper investigates a novel classification method to automatically analyze the recorded welding sequences and robustly find the abnormal error events. To our knowledge, it is the first time that a framework to detect and track sputters in welding sequences is proposed and evaluated. To achieve a high usability of the classification algorithm, in the training phase, the user only needs to mark suspicious sequences but does not need to label individual frames within the sequences. The framework is tested on two challenging data sets from real welding processes. The results show that the material particles can be tracked accurately. On a sample data set, the new approach finds all erroneous welds with a small false-positive rate and outperforms previously developed methods.

M Jager - One of the best experts on this subject based on the ideXlab platform.

  • sputter tracking for the automatic monitoring of Industrial Laser welding processes
    IEEE Transactions on Industrial Electronics, 2008
    Co-Authors: M Jager, S Humbert, Fred A Hamprecht
    Abstract:

    The importance of Laser welding in industry increases. Many welds have high-quality demands, and one possibility to satisfy the quality requirements is to monitor the welding process with high-speed cameras. Laser welding is a highly dynamic process; it is therefore challenging to distinguish between normal process fluctuations and abnormal error events in the recorded sequences. This paper investigates a novel classification method to automatically analyze the recorded welding sequences and robustly find the abnormal error events. To our knowledge, it is the first time that a framework to detect and track sputters in welding sequences is proposed and evaluated. To achieve a high usability of the classification algorithm, in the training phase, the user only needs to mark suspicious sequences but does not need to label individual frames within the sequences. The framework is tested on two challenging data sets from real welding processes. The results show that the material particles can be tracked accurately. On a sample data set, the new approach finds all erroneous welds with a small false-positive rate and outperforms previously developed methods.

S Humbert - One of the best experts on this subject based on the ideXlab platform.

  • sputter tracking for the automatic monitoring of Industrial Laser welding processes
    IEEE Transactions on Industrial Electronics, 2008
    Co-Authors: M Jager, S Humbert, Fred A Hamprecht
    Abstract:

    The importance of Laser welding in industry increases. Many welds have high-quality demands, and one possibility to satisfy the quality requirements is to monitor the welding process with high-speed cameras. Laser welding is a highly dynamic process; it is therefore challenging to distinguish between normal process fluctuations and abnormal error events in the recorded sequences. This paper investigates a novel classification method to automatically analyze the recorded welding sequences and robustly find the abnormal error events. To our knowledge, it is the first time that a framework to detect and track sputters in welding sequences is proposed and evaluated. To achieve a high usability of the classification algorithm, in the training phase, the user only needs to mark suspicious sequences but does not need to label individual frames within the sequences. The framework is tested on two challenging data sets from real welding processes. The results show that the material particles can be tracked accurately. On a sample data set, the new approach finds all erroneous welds with a small false-positive rate and outperforms previously developed methods.

Pere Roca I Cabarrocas - One of the best experts on this subject based on the ideXlab platform.

  • Large Area Radial Junction Silicon Nanowire Solar Mini-Modules
    Scientific Reports, 2018
    Co-Authors: Mutaz Al-ghzaiwat, Martin Foldyna, Takashi Fuyuki, Wanghua Chen, Erik V. Johnson, Jacques Meot, Pere Roca I Cabarrocas
    Abstract:

    In this work, we introduce the demonstration of 5 × 5 cm^2 mini-modules based on radial junction silicon nanowire (RJ SiNW) devices grown by plasma-assisted vapor-liquid-solid (VLS) technique. The mini-modules are obtained thanks to an Industrial Laser scribing technique. The electrical parameters have been highlighted to address the performance of these devices and perspectives towards competitive RJ SiNW solar modules. Moreover, electroluminescence (EL) measurements were also conducted to assess the uniformity of the fabricated mini-modules. In addition, the structural characterization of solar cells and Laser scribed lines has been assessed by scanning electron microscopy (SEM). The challenges and perspectives are also discussed.

A. Lobo - One of the best experts on this subject based on the ideXlab platform.

  • Retinal injury by Industrial Laser burn
    Occupational Medicine, 2014
    Co-Authors: P. Scollo, G. Herath, A. Lobo
    Abstract:

    The following case study describes an injury sustained to the fovea of the right eye of a senior en gineer engaged in the repair of a neodymium-doped yttrium aluminium garnet (Nd:YAG) Laser. Our patient presented with sudden loss of vision in his right eye following accidental exposure to an intense beam of light after the Laser's xenon flash-lamp fired unexpectedly. This accident occurred while the patient was aligning the optical coupler mirror parallel to Nd:YAG Laser rod ends using an L-CAT alignment aid. We describe the mechanism of retinal injury, outcome and important issues regarding the safe use of Lasers.