Dr. Florian Albert Profile

Dr. Florian Albert

at Scansonic GmbH

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Proceedings Article | 5 August 2009 Paper

Influence of different laser operation regimes on the specific energy required for rock removal in oil and gas well drilling applications

Florian Albert, Alexander Grimm, Michael Schmidt, Alain Cournoyer, Martin Briand, Pierre Galarneau

Proceedings Volume 7386, 73860U (2009) https://doi.org/10.1117/12.840423

KEYWORDS: Laser drilling, Pulsed laser operation, Ytterbium, Laser applications, Laser systems engineering, Carbon dioxide lasers, Continuous wave operation, Fiber lasers, Nd:YAG lasers, Carbon dioxide

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Although many practical hurdles remain to be addressed in the future, laser oil and gas well drilling has potential advantages over the conventional rotary drilling approach, such as a smaller footprint of the drilling rig, higher rates of penetration, reduction of downtime due to dull bits, reduction of waste caused by drilling mud, creation of a natural casing while drilling, and ability to drill in hard rock formations. One of the most promising applications is downhole laser perforation for well completion as an alternative to explosive technologies currently in use. In order to establish both the technical and economic feasibility of using lasers in oil and gas drilling operations, one can measure the laser energy required to remove a unit volume of rock. The resulting specific energy is a measure of the efficiency of the laser drilling process and depends on the rock type and the laser operation regime that determines the laser-rock interaction mechanism. In the present feasibility study, we compare the results of laser drilling tests conducted in two types of reservoir rocks, namely limestone and sandstone, at different laser wavelengths and for different laser operation regimes (continuous wave and pulsed regimes, different repetition rates and duty cycles) in terms of specific energy. We also discuss preliminary results on the influence of the temporal shape of the laser pulses in the nanosecond regime on the rock removal process as obtained with INO pulse-shaping fiber laser platform, with the objective to take advantage of the flexibility and the agility of such a laser source for drilling operations in different rock types.

Proceedings Article | 20 March 2007 Paper

Laser-based rework in electronics production

Florian Albert, Ihor Mys, Michael Schmidt

Proceedings Volume 6459, 645905 (2007) https://doi.org/10.1117/12.703125

KEYWORDS: Laser welding, Lead, Tin, Copper, Electronics, Laser scanners, 3D scanning, Scanners, Process control, Electronic components

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Despite the electronic manufacturing is well-established mass production process for a long time, the problem of reworking, i.a. reject and replace of defect components, still exists. The rework operations (soldering, replacement and desoldering) are performed in most cases manually. However, this practice is characterized by an inconsistent quality of the reworked solder joints and a high degree of physiological stress for the employees. In this paper, we propose a novel full-automated laser based soldering and rework process. Our developed soldering system is a pick-and-place unit with an integrated galvanometer scanner, a fiber coupled diode laser for quasi-simultaneous soldering and a pyrometer-based process control. The developed system provides soldering and reworking processes taking into account a kind of defect, a type of electronic component and quality requirements from the IPC- 610 norm. The paper spends a great deal of efforts to analyze quality of laser reworked solder joints. The quality depends mainly on the type and thickness of intermetallic phases between solder, pads and leads; the wetting angles between pad, solder and lead; and finally, the joint microstructure with its mechanical properties. The influence of the rework soldering on these three factors is discussed and compared to conventional laser soldering results. In order to optimize the quality of reworked joints, the different strategies of energy input are applied.

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