The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Bryan Kok Ann Ngoi - One of the best experts on this subject based on the ideXlab platform.
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Two-axis-scanning laser Doppler vibrometer for Precision Engineering
Optics and Lasers in Engineering, 2002Co-Authors: Karthik Venkatakrishnan, Bryan Kok Ann NgoiAbstract:Laser Doppler vibrometer (LVD) has been the most favorite instrument for Precision dynamics measurement due to its non-contact, high accuracy and high resolution. However, LDV can only give the dynamic data of a particular location on the entire feature. In order to get the whole field data, a laser beam-scanning mechanism has to be implemented. Currently, motor-driven scanning mirror is used to move the measurement probe from one point to another. The mechanical vibrations of the scanning mirror will reduce the measurement accuracy. This paper introduces a novel scanning LDV optical system embodied in an acousto-optic deflector scanning mechanism. It can improve the measurement accuracy since there is no mechanical motion involved. One main advantage of this system is that it generates a laser scanning beam in parallel that is different from the beam scanning in the conventional scanning laser Doppler vibrometer (SLDV). The new system has a board scanning range. The measurement target size ranges from few tens of millimeters down to 10 μm. We have demonstrated the capability of the novel system on scanning measurements of features as big as ultra-Precision cutting tool to features as tiny as AFM cantilever. We believe that the novel SLDV will find profound potential applications in the Precision Engineering field.
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Two-axis-scanning laser Doppler vibrometer for Precision Engineering
Optics and Lasers in Engineering, 2002Co-Authors: Karthik Venkatakrishnan, B. Tan, Bryan Kok Ann NgoiAbstract:Laser Doppler vibrometer (LVD) has been the most favorite instrument for Precision dynamics measurement due to its non-contact, high accuracy and high resolution. However, LDV can only give the dynamic data of a particular location on the entire feature. In order to get the whole field data, a laser beam-scanning mechanism has to be implemented. Currently, motor-driven scanning mirror is used to move the measurement probe from one point to another. The mechanical vibrations of the scanning mirror will reduce the measurement accuracy. This paper introduces a novel scanning LDV optical system embodied in an acousto-optic deflector scanning mechanism. It can improve the measurement accuracy since there is no mechanical motion involved. One main advantage of this system is that it generates a laser scanning beam in parallel that is different from the beam scanning in the conventional scanning laser Doppler vibrometer (SLDV). The new system has a board scanning range. The measurement target size ranges from few tens of millimeters down to 10μm. We have demonstrated the capability of the novel system on scanning measurements of features as big as ultra-Precision cutting tool to features as tiny as AFM cantilever. We believe that the novel SLDV will find profound potential applications in the Precision Engineering field. © 2002 Elsevier Science Ltd. All rights reserved.
Karthik Venkatakrishnan - One of the best experts on this subject based on the ideXlab platform.
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Two-axis-scanning laser Doppler vibrometer for Precision Engineering
Optics and Lasers in Engineering, 2002Co-Authors: Karthik Venkatakrishnan, Bryan Kok Ann NgoiAbstract:Laser Doppler vibrometer (LVD) has been the most favorite instrument for Precision dynamics measurement due to its non-contact, high accuracy and high resolution. However, LDV can only give the dynamic data of a particular location on the entire feature. In order to get the whole field data, a laser beam-scanning mechanism has to be implemented. Currently, motor-driven scanning mirror is used to move the measurement probe from one point to another. The mechanical vibrations of the scanning mirror will reduce the measurement accuracy. This paper introduces a novel scanning LDV optical system embodied in an acousto-optic deflector scanning mechanism. It can improve the measurement accuracy since there is no mechanical motion involved. One main advantage of this system is that it generates a laser scanning beam in parallel that is different from the beam scanning in the conventional scanning laser Doppler vibrometer (SLDV). The new system has a board scanning range. The measurement target size ranges from few tens of millimeters down to 10 μm. We have demonstrated the capability of the novel system on scanning measurements of features as big as ultra-Precision cutting tool to features as tiny as AFM cantilever. We believe that the novel SLDV will find profound potential applications in the Precision Engineering field.
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Two-axis-scanning laser Doppler vibrometer for Precision Engineering
Optics and Lasers in Engineering, 2002Co-Authors: Karthik Venkatakrishnan, B. Tan, Bryan Kok Ann NgoiAbstract:Laser Doppler vibrometer (LVD) has been the most favorite instrument for Precision dynamics measurement due to its non-contact, high accuracy and high resolution. However, LDV can only give the dynamic data of a particular location on the entire feature. In order to get the whole field data, a laser beam-scanning mechanism has to be implemented. Currently, motor-driven scanning mirror is used to move the measurement probe from one point to another. The mechanical vibrations of the scanning mirror will reduce the measurement accuracy. This paper introduces a novel scanning LDV optical system embodied in an acousto-optic deflector scanning mechanism. It can improve the measurement accuracy since there is no mechanical motion involved. One main advantage of this system is that it generates a laser scanning beam in parallel that is different from the beam scanning in the conventional scanning laser Doppler vibrometer (SLDV). The new system has a board scanning range. The measurement target size ranges from few tens of millimeters down to 10μm. We have demonstrated the capability of the novel system on scanning measurements of features as big as ultra-Precision cutting tool to features as tiny as AFM cantilever. We believe that the novel SLDV will find profound potential applications in the Precision Engineering field. © 2002 Elsevier Science Ltd. All rights reserved.
Minghui Hong - One of the best experts on this subject based on the ideXlab platform.
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Laser interaction with materials and its applications in Precision Engineering
SCIENTIA SINICA Physica Mechanica & Astronomica, 2016Co-Authors: Rui Zhou, Fengping Li, Minghui HongAbstract:In this paper, laser interaction with materials and its applications in Precision Engineering are mainly introduced. To further explore the physics behind laser interaction with materials, it is of much significance to investigate the mechanisms in the process. First of all, it is desired to understand the characteristics and principle of laser. Laser is generated by stimulated radiation, and has excellent physical properties, such as high monochromaticity, high brightness, high directivity and high coherence. Meanwhile, it benefits much to study the dynamic process of interactions and its mechanisms. There exist both photo-chemical and photo-thermal processes when laser and materials interact. Furthermore, developing laser application in nanomaterial synthesis is also an unique area. It is worth further studying the design and fabrication of nanostructured materials. Last but not least, it is interesting to explore the specific process and characteristics of laser processing, which play an important role in advanced manufacturing. In Precision Engineering, the tool of laser has also been more applicable considering its great advantages in microprocessing and nanofabrication. Several case studies are introduced, which have great potential and high impact applications, such as ultrafast laser direct writing, laser micro-lens lithography, laser nanofabrication to break through optical diffraction limit and hybrid micro/nanostructures with unique functions fabricated by laser. These studies have triggered intensive research interests due to their great application prospect.
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laser Precision Engineering from microfabrication to nanoprocessing
Laser & Photonics Reviews, 2010Co-Authors: Tow C Chong, Minghui HongAbstract:Laser Precision Engineering is being extensively applied in industries for device microfabrication due to its unique advantages of being a dry and noncontact process, coupled with the availability of reliable light sources and affordable system cost. To further reduce the feature size to the nanometer scale, the optical diffraction limit has to be overcome. With the combination of advanced processing tools such as SPM, NSOM, transparent and metallic particles, feature sizes as small as 20 nm have been achieved by near-field laser irradiation, which has extended the application scope of laser Precision Engineering significantly. Meanwhile, parallel laser processing has been actively pursued to realize large-area and high-throughput nanofabrication by the use of microlens arrays (MLA). Laser thermal lithography using a DVD optical storage process has also been developed to achieve low-cost and high-speed nanofabrication. Laser interference lithography, another large area nanofabrication technique, is also capable of fabricating sub-100 nm periodic structures. To further reduce the feature size to the atomic scale, atomic lithography using laser cooling to localize atoms is being developed, bringing laser-processing technology to a new era of atomic Engineering.
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Surface Nano-fabrication by Laser Precision Engineering
The Review of Laser Engineering, 2008Co-Authors: Minghui Hong, Yi Zhou, T C. ChongAbstract:Research progress on laser nano-fabrication with the combination of AFM, NSOM and transparent particles mask is reviewed. With the combination of other advanced processing tools, laser irradiation can push the processing feature size down to ~ 20 nm. However, laser nano-fabrication with single optics brings about the technical challenge of slow processing speed. Parallel laser nano-patterning was recently developed to achieve large area and high speed nano-fabrication with laser irradiation through a micro-lens array. Laser interference lithography is also studied to fabricate 100 nm functional periodic nanostructures on substrate surfaces.
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Laser Precision Engineering: From Microprocessing to Nanofabrication
2008Co-Authors: Minghui Hong, Z Q. Huang, T C. ChongAbstract:Laser Precision Engineering has advantages of non-contact process, flexible setup and high speed processing. Combined with other advanced processing tools, laser nanofabrication will play a much more important role in the next generation manufacturing.
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Laser Precision Engineering from microfabrication to nanoprocessing
2008 Conference on Lasers and Electro-Optics, 2008Co-Authors: Minghui Hong, Z Q. Huang, T C. ChongAbstract:Laser Precision Engineering has unique advantages of non-contact process, flexible setup and high speed processing in air. In the last decades, we have witnessed its extensive applications in various production lines. Combined with other advanced processing tools, laser nanofabrication will play a much more important role in the next generation manufacturing.
Paul Shore - One of the best experts on this subject based on the ideXlab platform.
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contributions of Precision Engineering to the revision of the si
Cirp Annals-manufacturing Technology, 2017Co-Authors: H. Bosse, Paul Shore, H Kunzmann, Jon R Pratt, Stephan Schlamminger, Ian Robinson, Michael De Podesta, Alessandro Balsamo, Paul MorantzAbstract:Abstract All measurements performed in science and industry are based on the International System of Units, the SI. It has been proposed to revise the SI following an approach which was implemented for the redefinition of the unit of length, the metre, namely to define the SI units by fixing the numerical values of so-called defining constants, including c, h, e, k and NA. We will discuss the reasoning behind the revision, which will likely be put into force in 2018. Precision Engineering was crucial to achieve the required small measurement uncertainties and agreement of measurement results for the defining constants.
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Ultra-Precision Engineering: from physics to manufacturing.
Philosophical Transactions of the Royal Society A, 2012Co-Authors: X. Jane Jiang, Paul Shore, Pat Mckeown, David J. Whitehouse, Philip Charles RufflesAbstract:Sir Christopher Wren is widely acknowledged as a key individual in the formation of the Royal Society, a society initially advocated ‘for the promotion of physico-mathematical experimental learning’. Many people would not be surprised to learn that England's most famous architect was a driving
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Precision Engineering behind European Astronomy Programmes
2011Co-Authors: Xavier Tonnellier, Paul ShoreAbstract:The fields of astronomy science have presented significant Precision Engineering challenges. Numerous solutions for these fields of science have achieved unprecedented levels of accuracy, sensitivity and sheer scale. Notwithstanding of their importance to science understanding, many of these Precision Engineering developments have become key enabling technologies for wealth generation and other human well-being issues. This paper provides a brief historical overview of astronomy instruments. Later, details of critical Precision Engineering developments that supported the establishment of leading European astronomical instruments are illustrated. Finally, significant Precision Engineering demands to enable future sciences programmes are introduced. In this short paper, we provide a brief historical overview of European astronomical developments. The paper subsequently provides details of significant Precision Engineering demands to enable recent European telescope programmes. Thereafter critical Precision manufacturing developments that will progress future European astronomical projects are presented. The paper has been adapted from a comprehensive CIRP Keynote on Precision Engineering for Astronomy and Gravity Science (1).
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Precision Engineering for astronomy and gravity science
Cirp Annals-manufacturing Technology, 2010Co-Authors: Paul Shore, C Cunningham, D Debra, Christopher J Evans, J Hough, R Gilmozzi, H Kunzmann, Paul Morantz, Xavier TonnellierAbstract:The fields of astronomy and gravitational science have presented significant Precision Engineering challenges. Numerous solutions for these fields of science have achieved unprecedented levels of accuracy, sensitivity and sheer scale. Notwithstanding of their importance to science understanding, many of these Precision Engineering developments have become key enabling technologies for wealth generation and other human well-being issues. This paper provides a brief historical overview of astronomy and gravitational instruments. Later, details of critical Precision Engineering developments that supported the establishment of leading astronomical and gravitational instruments are illustrated. Details of specific developments having wider application to the benefit of mankind are provided. Finally, significant Precision Engineering demands to enable future science programmes are introduced.
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Precision Engineering for optical applications: knowledge transfer into UK industry
11th Education and Training in Optics and Photonics Conference, 2009Co-Authors: Christopher L. Sansom, Paul ShoreAbstract:A means of facilitating the transfer of Precision Engineering knowledge and skills from academic institutions and their research partners into UK optics and optical Engineering companies is described. The process involves the creation of an Integrated Knowledge Centre (IKC), a partnership led by Cranfield University with the support of the University of Cambridge, University College London, and the OpTIC technium. This paper describes the development of the three main vehicles for knowledge transfer. These are a Masters level postgraduate degree course (the Cranfield University led MSc in “Ultra Precision Technologies”), a portfolio of industrial short courses which are designed to address key skills shortages in the fields of Precision Engineering for optical applications, and an e-learning package in Precision Engineering. The main issues encountered during the development of the knowledge transfer teaching and learning packages are discussed, and the outcomes from the first year of knowledge transfer activities are described. In overall summary, the results demonstrate how the Integrated Knowledge Centre in Ultra Precision and Structured Surfaces’ approach to knowledge transfer has been effective in addressing the Engineering skills gap in Precision optics based industries.
Juliane Nguyen - One of the best experts on this subject based on the ideXlab platform.
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Precision Engineering of targeted nanocarriers
Wiley Interdisciplinary Reviews-nanomedicine and Nanobiotechnology, 2018Co-Authors: Michael B Deci, Quoc Thai Dinh, Juliane NguyenAbstract:: Since their introduction in 1980, the number of advanced targeted nanocarrier systems has grown considerably. Nanocarriers capable of targeting single receptors, multiple receptors, or multiple epitopes have all been used to enhance delivery efficiency and selectivity. Despite tremendous progress, preclinical studies and clinically translatable nanotechnology remain disconnected. The disconnect in targeting efficacy may stem from poorly-understood factors such as receptor clustering, spatial control of targeting ligands, ligand mobility, and ligand architecture. Further, the relationship between receptor distribution and ligand architecture remains elusive. Traditionally, targeted nanocarriers were engineered assuming a "static" target. However, it is becoming increasingly clear that receptor expression patterns change in response to external stimuli and disease progression. Here, we discuss how cutting-edge technologies will enable a better characterization of the spatiotemporal distribution of membrane receptors and their clustering. We further describe how this will enable the design of new nanocarriers that selectively target the site of disease. Ultimately, we explore how the Precision Engineering of targeted nanocarriers that adapt to receptor dynamics will have the potential to drive nanotechnology to the forefront of therapy and make targeted nanomedicine a clinical reality. This article is categorized under: Therapeutic Approaches and Drug Discovery > Emerging Technologies Nanotechnology Approaches to Biology > Nanoscale Systems in Biology Biology-Inspired Nanomaterials > Lipid-Based Structures Biology-Inspired Nanomaterials > Protein and Virus-Based Structures.
