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We have developed a novel, rapid, robust and non-destructive experimental technique for in-situ monitoring of delamination of interfaces for electronic packages. The method is based on a simple thermal transducer matrix of so-called THIXELS (thermal pixels) which allows a spatially resolved real-time image of the current status of delamination. The transducers are small metal wire meanders which are...
Fault tolerance of converters and drive systems is becoming a key issue for many future applications. The Modular High Frequency Converter (MHF) is a new inverter topology, especially designed for applications, where high reliability and ultra-light weight are important. Besides superior dynamic behavior, continuous operation after defects is one of the main advantages of the Modular High Frequency...
Today, there is no non-destructive, simple, inexpensive and yet accurate in-situ monitoring technique for cracks and delamination available for routine use in electronic package testing. However, such a method is highly desirable, as delamination testing is part of every qualification programme in industry. Rapid failure analytical techniques which allow introspect and easy-to-interpret information...
High-temperature piezoelectric crystals such as gallium phosphate (GaPO4) and langasite (La3Ga5SiO14) have been demonstrated to show piezoelectric properties at fairly high temperatures. For example, langasite can be exited piezoelectrically up to temperatures close to its melting point at about 1470 °C. The resonance behavior including damping and temperature dependent frequency of resonators made...
Synthetic piezoelectric crystals in the P321 crystal class have been a focus of substantial research in relation to their application in high-temperature resonant bulk-acoustic-wave (BAW) and surface-acoustic-wave (SAW) sensors. Most of this research has been on partially disordered langasite (LGS) and langatate (LGT), but fully ordered crystals in this class, such as Ca3TaGa3Si2O14 (CTGS), have been...
Polyester-styrene polymer composites of high permittivity ceramic nano powders (barium titanate) are fabricated and electrically measured for antenna applications. It is shown that the usage of high permittivity ceramic contents can increase the relative permittivity of the composites to around 10 at microwave frequencies. The Polyester-styrene composite material preparation technique is described...
In this paper, the Advanced Mixed-Mode Bending Test (AMB) is presented. The AMB is an experimental method to determine the effects on the critical crack propagation in bi-material interfaces that exist in electronic packages. Target in the development of this test rig was a quick and cost-effective data collection in addition to easier handling of samples. By two independent load components, shearing...
In this paper a system for localization of passengers on ships and in the sea in case that passengers going overboard is described. System considerations taking into account parameters such as oscillation and modulation frequencies are conducted. The baseband architecture is discussed regarding necessary design tradeoffs for localization of a large amount of different passengers at a reasonable update...
The high repetition rate laser systems providing the ELI-ALPS facility with TW-to-PW peak intensity pulses are designed to generate secondary light sources with a duration of tens of attosecond for basic and applied researches.
We introduce a sensor network suitable for measuring pressure and light transmission in coastal seas over time periods of several months. The purpose is to use the collected data for the investigation of sediment transport processes in the tidal flats of the North Sea in particular during extreme events like storm surges and high tides. The main development objectives were to conceive a modular system...
This paper investigates some of the challenges encountered during the implementation of a high speed digital control for a Silicon Carbide JFET matrix converter which has been designed to meet a specific power density of 20kW/litre with forced air cooling. After a brief introduction on the main features of the hardware implementation of this unique power converter, an insight into the control strategy...
This paper reports a work-in-progress at the Centre for Educational Innovation and Technology (CEIT) at The University of Queensland on the design and implementation of a new remote laboratory architecture utilizing contemporary and emerging web standards. The RESTlabs architecture maintains the concept of a Lab Server that manages a rig upon which to run experiments and a Service Broker to manage...
This paper presents a comprehensive method for obtaining urgently required critical interface delamination data of material pairings used in electronic packaging. The objective is to thereby enable rapid, inexpensive and accurate lifetime prediction for that failure mode. A new testing method is presented which allows maximummode-angle range and enhanced throughput testing under multiple loading conditions,...
This paper presents a comprehensive method for obtaining urgently required critical interface delamination data of material pairings used in electronic packaging. The objective is to thereby enable rapid, inexpensive and accurate lifetime prediction for that failure mode. A new testing method is presented which allows maximum mode-angle range and enhanced throughput testing under multiple loading...
For a single quantum dot under excitation with short electrical pulses the dependence of the photon anti-bunching on pulse width and excitation strength is studied in a theory-experiment collaboration.
An Yb:YAG thin-disk laser amplifier is presented capable of amplifying pulses to a maximum average power of 4.45 kW at burst repetition rates of 100 kHz as pump amplifier for an optical parametric amplifier system.
This paper presents a comprehensive method for obtaining urgently required critical interface delamination data of material pairings used in electronic packaging. The objective is to thereby enable rapid, inexpensive and accurate lifetime prediction for that failure mode. A new testing method is presented which allows large mode-angle range and enhanced throughput testing under multiple loading conditions,...
In recent years, vertical external cavity surface-emitting lasers (VECSELs) became an important category of power-scalable semiconductor lasers in a wide range of applications. Examples can be found in many fields of work as biophotonics, television or projectors, spectroscopy or lithography. Using external cavities and optical excitation, VECSELs exhibit high continuous-wave (cw) output power and...
Compact and efficient single-photon sources are key components for several future applications, e.g in quantum cryptography, random number generators, and for a future standard of optical brightness. To date, commercial single-photon detectors provide highest sensitivity in the red spectral range and single-photon based technologies such as quantum communication benefit from their low detector dark...
A supply chain is a complex system with numerous members and interrelations. To be able to control and regulate the system's behavior, the different subsystems need to be monitored and the results need evaluated. Thus, a systematic approach is needed, which goal it is to provide the expected information to the right actor at the right time. This paper provides an information requirements analysis...
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