Carl Meggs - Academia.edu (original) (raw)
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Pakistan Institute of engineering and applied science (PIEAS)
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Papers by Carl Meggs
International Journal of Structural Stability and Dynamics, 2014
2014 IEEE 16th Electronics Packaging Technology Conference (EPTC), 2014
Advances in X-Ray/EUV Optics and Components IV, 2009
Piezoelectric actuators are widely employed in adaptive optics to enable an actively controlled m... more Piezoelectric actuators are widely employed in adaptive optics to enable an actively controlled mirror surface and improve the optical resolution and sensitivity. Currently two new prototype adaptive X-ray optical systems are under development through the Smart X-ray Optics project in a UK based consortium. One proposed technology is microstructured optical arrays (MOAs) which uses aligned micro-channels structures obtained by deep silicon etching using both dry and wet techniques and bonded piezoelectric actuators to produce a micro-focused X-ray source for biological applications. The other technology is large scale optics which uses a thin shell mirror segment with 20-40 bonded piezoactuators for the next generation of X-ray telescopes with an aim to achieve a resolution greater than that currently available by Chandra (0.5").
Adaptive X-Ray Optics, 2010
The Smart X-Ray Optics (SXO) project comprises a UK-based consortium developing active/adaptive m... more The Smart X-Ray Optics (SXO) project comprises a UK-based consortium developing active/adaptive micro-structured optical arrays (MOAs). These devices are designed to focus X-rays using grazing incidence reflection through consecutive aligned arrays of ...
Adaptive X-Ray Optics, 2010
The design of current X-ray telescope systems needs to reach a compromise between the resolution ... more The design of current X-ray telescope systems needs to reach a compromise between the resolution and sensitivity. A new area of interest of adaptive optics is the development of actively controlled thin X-ray mirrors, where aberrations would be corrected. Their assembly on an X-ray ...
Journal of the European Ceramic Society, 2007
Tunable capacitor elements for microwave phase shifter applications have been fabricated by scree... more Tunable capacitor elements for microwave phase shifter applications have been fabricated by screen printing barium strontium titanate (BST) films on alumina substrates. A Ba 0.70 Sr 0.30 TiO 3 composition was chosen for the initial devices as it has been shown to exhibit high ...
The Journal of the Acoustical Society of America, 2008
ABSTRACT As research into transducers and arrays for real-time high frequency biomedical ultrasou... more ABSTRACT As research into transducers and arrays for real-time high frequency biomedical ultrasound imaging continues, it is becoming increasingly clear that major applications exist for systems with significantly higher spatial resolution than those already available for human clinical imaging. A key area of research remains the design and fabrication of the transducer or array. It is now accepted that piezocomposite is the material of choice and composite design and conventional dice-and-fill fabrication techniques have been optimised to allow 40 MHz operation, corresponding to wavelengths around 40 um. This expands the range of applications of piezocomposites but is still limited in terms of resolution of fine structures, for example at cellular level and to explore harmonic imaging. In this paper, we report continuing progress in work on new design techniques and fabrication processes with the potential for fabricating arrays that operate up to 100 MHz. The net-shape micromoulding fabrication technique for the ceramic within our composites is outlined, new single element transducer designs and array fabrication based on advanced surface finishing and photolithographic processes are described, and results are presented illustrating key performance data such as the point spread function, insertion loss and imaging of post mortem human tissue.
International Journal of Structural Stability and Dynamics, 2014
2014 IEEE 16th Electronics Packaging Technology Conference (EPTC), 2014
Advances in X-Ray/EUV Optics and Components IV, 2009
Piezoelectric actuators are widely employed in adaptive optics to enable an actively controlled m... more Piezoelectric actuators are widely employed in adaptive optics to enable an actively controlled mirror surface and improve the optical resolution and sensitivity. Currently two new prototype adaptive X-ray optical systems are under development through the Smart X-ray Optics project in a UK based consortium. One proposed technology is microstructured optical arrays (MOAs) which uses aligned micro-channels structures obtained by deep silicon etching using both dry and wet techniques and bonded piezoelectric actuators to produce a micro-focused X-ray source for biological applications. The other technology is large scale optics which uses a thin shell mirror segment with 20-40 bonded piezoactuators for the next generation of X-ray telescopes with an aim to achieve a resolution greater than that currently available by Chandra (0.5").
Adaptive X-Ray Optics, 2010
The Smart X-Ray Optics (SXO) project comprises a UK-based consortium developing active/adaptive m... more The Smart X-Ray Optics (SXO) project comprises a UK-based consortium developing active/adaptive micro-structured optical arrays (MOAs). These devices are designed to focus X-rays using grazing incidence reflection through consecutive aligned arrays of ...
Adaptive X-Ray Optics, 2010
The design of current X-ray telescope systems needs to reach a compromise between the resolution ... more The design of current X-ray telescope systems needs to reach a compromise between the resolution and sensitivity. A new area of interest of adaptive optics is the development of actively controlled thin X-ray mirrors, where aberrations would be corrected. Their assembly on an X-ray ...
Journal of the European Ceramic Society, 2007
Tunable capacitor elements for microwave phase shifter applications have been fabricated by scree... more Tunable capacitor elements for microwave phase shifter applications have been fabricated by screen printing barium strontium titanate (BST) films on alumina substrates. A Ba 0.70 Sr 0.30 TiO 3 composition was chosen for the initial devices as it has been shown to exhibit high ...
The Journal of the Acoustical Society of America, 2008
ABSTRACT As research into transducers and arrays for real-time high frequency biomedical ultrasou... more ABSTRACT As research into transducers and arrays for real-time high frequency biomedical ultrasound imaging continues, it is becoming increasingly clear that major applications exist for systems with significantly higher spatial resolution than those already available for human clinical imaging. A key area of research remains the design and fabrication of the transducer or array. It is now accepted that piezocomposite is the material of choice and composite design and conventional dice-and-fill fabrication techniques have been optimised to allow 40 MHz operation, corresponding to wavelengths around 40 um. This expands the range of applications of piezocomposites but is still limited in terms of resolution of fine structures, for example at cellular level and to explore harmonic imaging. In this paper, we report continuing progress in work on new design techniques and fabrication processes with the potential for fabricating arrays that operate up to 100 MHz. The net-shape micromoulding fabrication technique for the ceramic within our composites is outlined, new single element transducer designs and array fabrication based on advanced surface finishing and photolithographic processes are described, and results are presented illustrating key performance data such as the point spread function, insertion loss and imaging of post mortem human tissue.