The Experts below are selected from a list of 39 Experts worldwide ranked by ideXlab platform
Stefan Kaierle - One of the best experts on this subject based on the ideXlab platform.
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Demonstration of a mobile Laser Cutting system for complex rescue operations
Journal of Laser Applications, 2019Co-Authors: Alexander Brodesser, Christian Hennigs, Alexander Pfaff, Robert Grafe, Michael Hustedt, Stefan KaierleAbstract:In the case of serious accidents, severely injured persons may be trapped inside damaged vehicles and thus must be rescued quickly. Typically, structural parts containing high-strength steels or fiber-reinforced plastics must be cut to generate rescue openings. Hence, mechanical rescue systems like hydraulic shears may reach their performance limits. Therefore, a mobile Laser Cutting Device for rescuers has been developed, being suitable for harsh outdoor conditions and providing optimized robustness, handleability, and weight. A crucial aspect is the requirement of Laser safety for all persons involved. Here, the description of the first version of a demonstration system consisting of a mobile Laser Cutting Device for complex rescue operations is presented.In the case of serious accidents, severely injured persons may be trapped inside damaged vehicles and thus must be rescued quickly. Typically, structural parts containing high-strength steels or fiber-reinforced plastics must be cut to generate rescue openings. Hence, mechanical rescue systems like hydraulic shears may reach their performance limits. Therefore, a mobile Laser Cutting Device for rescuers has been developed, being suitable for harsh outdoor conditions and providing optimized robustness, handleability, and weight. A crucial aspect is the requirement of Laser safety for all persons involved. Here, the description of the first version of a demonstration system consisting of a mobile Laser Cutting Device for complex rescue operations is presented.
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Mobile Laser Cutting system for complex rescue operations
High-Power Laser Materials Processing: Applications Diagnostics and Systems VII, 2018Co-Authors: Christian Hennigs, Alexander Brodesser, Robert Grafe, Michael Hustedt, Stefan KaierleAbstract:When a serious motor vehicle accident happens, persons with severe injuries may be trapped inside damaged vehicles. In these cases, it is necessary to rescue the injured persons as fast as possible to increase their chance to survive. Nevertheless, secondary injuries due to the rescue procedures must be avoided. In this scenario, structural parts typically have to be cut to create rescue openings. Therefore, several high-tech rescue systems are available, most common hydraulic apparatus. Alternatively, reciprocating saws, angle grinders or plasma cutters are used, depending on the specific on-scene conditions. Lately, there has been tremendous progress regarding the developments on vehicle safety. One example is the integration of super high-strength steels and carbon fiber reinforced plastics, concurrently meeting the requirements of weight reduction. As a result, mechanical rescue systems like hydraulic shears reach their performance limits. The main goal of this work is the development of a mobile Laser Cutting Device for rescue operations. The focus is put on high flexibility concerning the processing of high-strength materials and multilayer structures. Moreover, robustness, easy handling and system weight shall be optimized, as rescuers often work under harsh conditions concerning temperature, humidity, dirt and stress. Crucial aspect of Laser rescuing is safety which must be guaranteed for all persons involved at any time. Here, results of Laser Cutting experiments, using materials and structures relevant for rescue situations, are presented.
Ngoc Bich Le - One of the best experts on this subject based on the ideXlab platform.
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An experimental and numerical investigation into the effects of the PZT actuator shape in polymethylmethacrylate (PMMA) peristaltic micropumps
Microsystem Technologies-micro-and Nanosystems-information Storage and Processing Systems, 2009Co-Authors: Ngoc Bich LeAbstract:Utilizing a solvent-assisted bonding process, two diffuser-type polymethylmethacrylate (PMMA) peristaltic micropumps are fabricated with a linear array of circular microchambers with a depth and diameter of 15 m and 7 mm, respectively, actuated using either square or circular PZT actuators. Experimental trials are performed to characterize the performance of the two micropumps under driving frequencies ranging from 80 to 150 Vpp and actuation frequencies in the range of 10 Hz to 1 kHz. The results reveal that the micropump with square PZT actuators generates a maximum pumping rate and back pressure of 217 l/min and 9.2 kPa, respectively, while the micropump with circular actuators generates a maximum flow rate of 131 l/min and a back pressure of 2.7 kPa. ANSYS finite element simulations demonstrate two events. First, given an equivalent surface area, the circular actuators undergo a greater displacement than the square actuators under given actuation conditions. In other words, the circular actuator design is more efficient to represent a higher ratio of the displacement to the actuation area (d/A). However, the circular actuators with the surface area of 38.47 mm2 are smaller than the square actuators (49 mm2). In addition, it is inferred that the relatively poorer performance of the circular actuators is due in part to thermal damage of the PZT patches during their removal from the bulk PZT chip using a Laser Cutting Device in the pump fabrication process. Secondly, when the shape of the effective working area for the actuation is rectangular which is usual in a MEMS design, the rectangular actuator with length of 7 mm has significantly higher displacement (0.71 m) than that of the circular actuator with diameter of 7 mm (0.396 m). Consequently, a rectangular actuator design presents a more practical solution for higher performance of micro-actuators.
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An experimental and numerical investigation into the effects of the PZT actuator shape in polymethylmethacrylate (PMMA) peristaltic micropumps
Microsystem Technologies-micro-and Nanosystems-information Storage and Processing Systems, 2009Co-Authors: Ngoc Bich LeAbstract:Utilizing a solvent-assisted bonding process, two diffuser-type polymethylmethacrylate (PMMA) peristaltic micropumps are fabricated with a linear array of circular microchambers with a depth and diameter of 15 m and 7 mm, respectively, actuated using either square or circular PZT actuators. Experimental trials are performed to characterize the performance of the two micropumps under driving frequencies ranging from 80 to 150 Vpp and actuation frequencies in the range of 10 Hz to 1 kHz. The results reveal that the micropump with square PZT actuators generates a maximum pumping rate and back pressure of 217 l/min and 9.2 kPa, respectively, while the micropump with circular actuators generates a maximum flow rate of 131 l/min and a back pressure of 2.7 kPa. ANSYS finite element simulations demonstrate two events. First, given an equivalent surface area, the circular actuators undergo a greater displacement than the square actuators under given actuation conditions. In other words, the circular actuator design is more efficient to represent a higher ratio of the displacement to the actuation area (d/A). However, the circular actuators with the surface area of 38.47 mm2 are smaller than the square actuators (49 mm2). In addition, it is inferred that the relatively poorer performance of the circular actuators is due in part to thermal damage of the PZT patches during their removal from the bulk PZT chip using a Laser Cutting Device in the pump fabrication process. Secondly, when the shape of the effective working area for the actuation is rectangular which is usual in a MEMS design, the rectangular actuator with length of 7 mm has significantly higher displacement (0.71 m) than that of the circular actuator with diameter of 7 mm (0.396 m). Consequently, a rectangular actuator design presents a more practical solution for higher performance of micro-actuators.
Raimund Erbel - One of the best experts on this subject based on the ideXlab platform.
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Vision-guided Laser atherectomy
Minimally Invasive Therapy & Allied Technologies, 1997Co-Authors: Lothar Koch, Th. Roth, Raimund ErbelAbstract:Summary. Atherectomy is emerging as a new therapeutic modality in the treatment of atherosclerotic vascular diseases both in the peripheral and coronary arteries. To reduce complications such as vessel wall perforation and occlusion, we developed a new vision-guided Laser atherectomy catheter in order to image and treat simultaneously. The catheter consists of a Laser Cutting Device with an integrated imaging system (fibre-optic or ultrasound). For positioning in the vessel an inflatable balloon is fixed on the opposite side of a micro metal Cutting chamber. A conic flexible tip with a collection housing mounted onto the distal end of the sheath is used to extract ablated plaque fragments. By combining state-of-the-art imaging and interventional technology, our developed precision-guided directional Laser atherectomy system may provide more effective percutaneous coronary revascularization than previously developed techniques.
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760-1 The Precision Guided Directional Laser Atherectomy Catheter: A New Approach to Percutaneous Coronary Revascularisation
Journal of the American College of Cardiology, 1995Co-Authors: Raimund Erbel, Thomas Dr Roth, Lothar Koch, Michael HaudeAbstract:Directional coronary atherectomy has been shown to be a successful method of percutaneous coronary revascularisation, particularly in large vessels with eccentric stenoses. The application of Laser technology to coronary revascularisation has not been as successful, mainly because of a relatively high rate of vessel wall perforation. We describe a combination endovascular imaging/Laser atherectomy catheter (Precision Guided Directional Laser Atherectomy Catheter, PGDLAC) that may overcome these shortcomings by allowing precision guided intervention. The catheter consists of a Laser Cutting Device with an integrated imaging system (fiberoptic or ultrasound). Fiberoptic imaging allows exact positioning and orientation of the Laser tipped catheter within the vessel lumen, and visual control of plaque excision. In the second step, the vessel wall morphology is demonstrated using ultrasound, and the result of the intervention assessed without removing the catheter. Excised plaque fragments are extracted by way of the catheter, Preliminary results of in vitro experimental application of this Device in human coronary arteries is promising and confirms the technical feasibility. Such a Device potentially offers the advantages of effective, precision guided atherectomy in plaques of variable constitution, with a potential reduction in procedure time and radiation dose. By combining state of the art imaging and interventional technology, we have developed a precision guided directional Laser atherectomy system that may provide more effective percutaneous coronary revascularisation than previously developed techniques.
Christian Hennigs - One of the best experts on this subject based on the ideXlab platform.
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Demonstration of a mobile Laser Cutting system for complex rescue operations
Journal of Laser Applications, 2019Co-Authors: Alexander Brodesser, Christian Hennigs, Alexander Pfaff, Robert Grafe, Michael Hustedt, Stefan KaierleAbstract:In the case of serious accidents, severely injured persons may be trapped inside damaged vehicles and thus must be rescued quickly. Typically, structural parts containing high-strength steels or fiber-reinforced plastics must be cut to generate rescue openings. Hence, mechanical rescue systems like hydraulic shears may reach their performance limits. Therefore, a mobile Laser Cutting Device for rescuers has been developed, being suitable for harsh outdoor conditions and providing optimized robustness, handleability, and weight. A crucial aspect is the requirement of Laser safety for all persons involved. Here, the description of the first version of a demonstration system consisting of a mobile Laser Cutting Device for complex rescue operations is presented.In the case of serious accidents, severely injured persons may be trapped inside damaged vehicles and thus must be rescued quickly. Typically, structural parts containing high-strength steels or fiber-reinforced plastics must be cut to generate rescue openings. Hence, mechanical rescue systems like hydraulic shears may reach their performance limits. Therefore, a mobile Laser Cutting Device for rescuers has been developed, being suitable for harsh outdoor conditions and providing optimized robustness, handleability, and weight. A crucial aspect is the requirement of Laser safety for all persons involved. Here, the description of the first version of a demonstration system consisting of a mobile Laser Cutting Device for complex rescue operations is presented.
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Mobile Laser Cutting system for complex rescue operations
High-Power Laser Materials Processing: Applications Diagnostics and Systems VII, 2018Co-Authors: Christian Hennigs, Alexander Brodesser, Robert Grafe, Michael Hustedt, Stefan KaierleAbstract:When a serious motor vehicle accident happens, persons with severe injuries may be trapped inside damaged vehicles. In these cases, it is necessary to rescue the injured persons as fast as possible to increase their chance to survive. Nevertheless, secondary injuries due to the rescue procedures must be avoided. In this scenario, structural parts typically have to be cut to create rescue openings. Therefore, several high-tech rescue systems are available, most common hydraulic apparatus. Alternatively, reciprocating saws, angle grinders or plasma cutters are used, depending on the specific on-scene conditions. Lately, there has been tremendous progress regarding the developments on vehicle safety. One example is the integration of super high-strength steels and carbon fiber reinforced plastics, concurrently meeting the requirements of weight reduction. As a result, mechanical rescue systems like hydraulic shears reach their performance limits. The main goal of this work is the development of a mobile Laser Cutting Device for rescue operations. The focus is put on high flexibility concerning the processing of high-strength materials and multilayer structures. Moreover, robustness, easy handling and system weight shall be optimized, as rescuers often work under harsh conditions concerning temperature, humidity, dirt and stress. Crucial aspect of Laser rescuing is safety which must be guaranteed for all persons involved at any time. Here, results of Laser Cutting experiments, using materials and structures relevant for rescue situations, are presented.
Alexander Brodesser - One of the best experts on this subject based on the ideXlab platform.
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Demonstration of a mobile Laser Cutting system for complex rescue operations
Journal of Laser Applications, 2019Co-Authors: Alexander Brodesser, Christian Hennigs, Alexander Pfaff, Robert Grafe, Michael Hustedt, Stefan KaierleAbstract:In the case of serious accidents, severely injured persons may be trapped inside damaged vehicles and thus must be rescued quickly. Typically, structural parts containing high-strength steels or fiber-reinforced plastics must be cut to generate rescue openings. Hence, mechanical rescue systems like hydraulic shears may reach their performance limits. Therefore, a mobile Laser Cutting Device for rescuers has been developed, being suitable for harsh outdoor conditions and providing optimized robustness, handleability, and weight. A crucial aspect is the requirement of Laser safety for all persons involved. Here, the description of the first version of a demonstration system consisting of a mobile Laser Cutting Device for complex rescue operations is presented.In the case of serious accidents, severely injured persons may be trapped inside damaged vehicles and thus must be rescued quickly. Typically, structural parts containing high-strength steels or fiber-reinforced plastics must be cut to generate rescue openings. Hence, mechanical rescue systems like hydraulic shears may reach their performance limits. Therefore, a mobile Laser Cutting Device for rescuers has been developed, being suitable for harsh outdoor conditions and providing optimized robustness, handleability, and weight. A crucial aspect is the requirement of Laser safety for all persons involved. Here, the description of the first version of a demonstration system consisting of a mobile Laser Cutting Device for complex rescue operations is presented.
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Mobile Laser Cutting system for complex rescue operations
High-Power Laser Materials Processing: Applications Diagnostics and Systems VII, 2018Co-Authors: Christian Hennigs, Alexander Brodesser, Robert Grafe, Michael Hustedt, Stefan KaierleAbstract:When a serious motor vehicle accident happens, persons with severe injuries may be trapped inside damaged vehicles. In these cases, it is necessary to rescue the injured persons as fast as possible to increase their chance to survive. Nevertheless, secondary injuries due to the rescue procedures must be avoided. In this scenario, structural parts typically have to be cut to create rescue openings. Therefore, several high-tech rescue systems are available, most common hydraulic apparatus. Alternatively, reciprocating saws, angle grinders or plasma cutters are used, depending on the specific on-scene conditions. Lately, there has been tremendous progress regarding the developments on vehicle safety. One example is the integration of super high-strength steels and carbon fiber reinforced plastics, concurrently meeting the requirements of weight reduction. As a result, mechanical rescue systems like hydraulic shears reach their performance limits. The main goal of this work is the development of a mobile Laser Cutting Device for rescue operations. The focus is put on high flexibility concerning the processing of high-strength materials and multilayer structures. Moreover, robustness, easy handling and system weight shall be optimized, as rescuers often work under harsh conditions concerning temperature, humidity, dirt and stress. Crucial aspect of Laser rescuing is safety which must be guaranteed for all persons involved at any time. Here, results of Laser Cutting experiments, using materials and structures relevant for rescue situations, are presented.
