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current BCI Technologies in Brain engineering

Current BCI Technologies in Brain Engineering

引用

IEEE International conference on Robotics, Biomimetics, and Intelligent Computational systems (ROBIONETICS)

作者： Hong, Keum-Shik Santosa, Hendrik Pusan Natl Univ Dept Cognomechatron Engn Pusan 609735 South Korea

ISBN: (纸本)9781479912063

Various neuroimaging modalities have appeared to acquire brain signals for developing a brain-computer interface (BCI). In this article, we review studies on different modalities including both invasive and non-invasive techniques for the implementation of BCIs, for brain signals detection, decoding, feature extraction, and classification. We discuss their advantages, disadvantages, and implementation issues to design of BCIs. Finally, we focus on fundamental principles, recent developments, and applications by using optical imaging as a promising modality for BCI applications.

关键词： neuroimaging brain-computer interface noninvasive neurorehabilitaion

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New feedback optimization method based on arithmetic sequence for an extended LED source

New feedback optimization method based on arithmetic sequenc...

引用

2013 International conference on Mechanical and Electronics engineering, ICMEE 2013

作者： Shi, Zhi Wei Yan, Guo Dong Deng, Guo Qiang Luo, De Han Wang, Qin Ruo Liang, Ming Juan Zhu, Bing Zhong School of Information Engineering Guangdong University of Technology Guangzhou 510006 China Dongguan Kingsun Optoelectronic Co. LTD Dongguan 523625 China

ISBN: (纸本)9783037858103

A new feedback optimization design method based on arithmetic sequence is proposed to design free-form optical systems for an extended LED source. Taken LED lens designed by this method as an example, we find that the design process is simple and high regional illuminance uniformity and high light output efficiency could be simultaneously achieved. © (2013) Trans Tech Publications, Switzerland.

关键词： Light emitting diodes

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New detectors and detector architectures for high resolution optical sensor systems

New detectors and detector architectures for high resolution...

引用

7th International conference on Sensing Technology (ICST)

作者： Eckardt, Andreas Reulke, Ralf DLR German Aerosp Ctr Inst Opt Sensor Syst Berlin Germany

ISBN: (纸本)9781467352215;9781467352208

The Institute of optical Sensor systems (OS) as member of the Robotics and Mechatronics Cluster of the German Aerospace Center (DLR) has more than 30 years experiences with high-resolution imaging technology. The technology changes in the development of detectors, as well as the significant change of the manufacturing accuracy in combination with the engineering research define the next generation of spaceborne sensor systems focusing on Earth observation and remote sensing. The combination of large TDI (time delay and integration) lines, intelligent synchronization control, fastreadable sensors and new focal-plane concepts open the door to new remote-sensing instruments. This class of instruments is feasible for high-resolution sensor systems regarding geometry and radiometry and their data products like 3D virtual reality. Systemic approaches are essential for such designs of complex sensor systems for dedicated tasks. The system theory of the instrument inside a simulated environment is the beginning of the optimization process for the optical, mechanical and electrical designs. Single modules and the entire system have to be calibrated and verified. Suitable procedures must be defined on component, module and system level for the assembly test and verification process. This kind of development strategy allows the hardware-in-the-loop design. The paper gives an overview about the current developments at DLR OS in the field of innovative sensor systems design for spatial and spectral high resolution remote sensing instruments.

关键词： Focal plane technology large TDI BTDI sensors sCMOS Focal Plane Earth observation instrument geometric accuracy radiometric accuracy instrument optimization process large focal plane high mechanical accuracy

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Acoustic-resolution Photoacoustic Imaging System with Simple Fiber Illumination

Acoustic-resolution Photoacoustic Imaging System with Simple...

引用

conference on Photons Plus Ultrasound - Imaging and Sensing

作者： Tsunoi, Yasuyuki Sato, Shunichi Watanabe, Ryota Kawauchi, Satoko Ashida, Hiroshi Terakawa, Mitsuhiro Keio Univ Sch Integrated Design Engn Kohoku Ku Yokohama Kanagawa 2238522 Japan

ISBN: (纸本)9780819493507

Acoustic-resolution photoacoustic microscopy (AR-PAM) with dark-field confocal illumination enables unique high-resolution visualization of chromophores in tissue, such as microvasculatures, within depths of a few millimeters. However, most current systems are bulky and use complex optical components for illumination, thus requiring highly sensitive alignment. In this study, we developed a compact alignment-free acoustic-resolution photoacoustic imaging system with simple fiber illumination. Four optical fibers were placed in four directions around a high-frequency (30-MHz) ultrasound sensor attached with the high-numerical-aperture acoustic lens. The setting angle of the fibers were determined to form a dark field on the tissue surface under the acoustic lens and for the four light beams from the fibers to be combined near the focal point of the acoustic lens, i.e., at a depth of around 1.2 mm in the tissue. The acoustic lens and output ends of the fibers were capped with an acoustically and optically transparent engineering plastic sheet, whose surface can be directly placed and scanned on the tissue surface with ultrasound gel. The diameter and height of this imaging head were as small as 32 mm and 27 mm respectively. The phantom study showed that the lateral signal spreading was 120. m, which agreed well with the theoretical value of 112. m. With the system, we attempted to image vasculatures in the rat skin, demonstrating high-contrast visualization of the blood vessels of a few hundred micrometers in diameter in the tissue.

关键词： photoacoustic microscopy optical fiber illumination vascular imaging acoustic lens ultrasound focusing

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current BCI technologies in brain engineering

Current BCI technologies in brain engineering

引用

IEEE International conference on Robotics, Biomimetics, and Intelligent Computational systems (ROBIONETICS)

作者： Keum-Shik Hong Hendrik Santosa School of Mechanical Engineering Pusan National University Busan Korea Department of Cogno-Mechatronics Engineering Pusan National University Busan Korea

关键词： Wavelength measurement Feature extraction Electroencephalography Magnetic resonance imaging Motion measurement Detectors Artificial neural networks

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New detectors and detector architectures for high resolution optical sensor systems

New detectors and detector architectures for high resolution...

引用

International conference on Sensing Technology, ICST

作者： Andreas Eckardt Ralf Reulke Institute of Optical Sensor Systems DLR German Aerospace Center Berlin Germany

The Institute of optical Sensor systems (OS) as member of the Robotics and Mechatronics Cluster of the German Aerospace Center (DLR) has more than 30 years experiences with high-resolution imaging technology. The technology changes in the development of detectors, as well as the significant change of the manufacturing accuracy in combination with the engineering research define the next generation of spaceborne sensor systems focusing on Earth observation and remote sensing. The combination of large TDI (time delay and integration) lines, intelligent synchronization control, fast-readable sensors and new focal-plane concepts open the door to new remote-sensing instruments. This class of instruments is feasible for high-resolution sensor systems regarding geometry and radiometry and their data products like 3D virtual reality. Systemic approaches are essential for such designs of complex sensor systems for dedicated tasks. The system theory of the instrument inside a simulated environment is the beginning of the optimization process for the optical, mechanical and electrical designs. Single modules and the entire system have to be calibrated and verified. Suitable procedures must be defined on component, module and system level for the assembly test and verification process. This kind of development strategy allows the hardware-in-the-loop design. The paper gives an overview about the current developments at DLR OS in the field of innovative sensor systems design for spatial and spectral high resolution remote sensing instruments.

关键词： Detectors Signal to noise ratio Instruments optical sensors Wavelength measurement Extraterrestrial measurements

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Novel global optimization algorithms: binary construction and the saddle-point method

Novel global optimization algorithms: binary construction an...

引用

conference on current developments in lens design and optical engineering XIII

作者： Dilworth, Donald C. Optical Systems Design Inc. (United States)

ISBN: (纸本)9780819492036

This paper describes our experience with global lens optimization using algorithms that can modify an existing lens construction in an optimal way or create an entirely new construction. The binary-search method assembles lens elements according to the bits in a binary number, ensuring that all combinations of power are tested, while the saddle-point method can either add elements to a starting lens or start from scratch. The latter algorithm also naturally leads to a method of removing an element in an optimum way, which can sometimes simplify a lens with no loss of quality.

关键词： Global optimization lens design saddle-point lens optimization PSD algorithm

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Finding starting points analytically for optical system optimization

Finding starting points analytically for optical system opti...

引用

conference on current developments in lens design and optical engineering XIII

作者： Bociort, F. van Grol, P. Delft Univ Technol Opt Res Grp NL-2628 CJ Delft Netherlands

ISBN: (纸本)9780819492036

Understanding the structure of the design space in optical system optimization is difficult, because common human intuition fails when it encounters the challenge of high dimensionality, resulting from the many optimization parameters of lens systems. However, a deep mathematical idea, that critical points structure the properties of the space around them, is fruitful in lens design as well. Here we discuss simple systems, triplets with curvatures as variables, for which the design space is still simple enough to be studied in detail, but complex enough to be non-trivial. A one-to-one correspondence between the possible design shapes and the critical points resulting from a simplified model based on third-order spherical aberration within the framework of thin-lens theory could lead in the future to a new way to determine good starting points for subsequent local optimization.

关键词： saddle point critical point global optimization optical system design

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design and fabrication of imaging optical systems with freeform surfaces

Design and fabrication of imaging optical systems with freef...

引用

conference on current developments in lens design and optical engineering XIII

作者： Zhang Xin Zheng Ligong He Xin Wang Lingjie Zhang Feng Yu Shuqin Shi Guangwei Zhang Binzhi Liu Qiang Wang Tongtong Changchun Inst Opt Key Lab Opt Syst Adv Mfg Technol Changchun 130033 Peoples R China

ISBN: (纸本)9780819492036

Freeform surfaces provide more degrees of freedom for design of optical systems, and enhance the ability of compensation and correction aberrations. Freeform surfaces are of advantage to balance the unsymmetrical aberrations, especially for the wide-field off-axis optical systems. This paper focus on an off-axis reflective optical system, which focal length is 550mm, F# is 6.5 and field of view (FOV) is 76 degrees. The system adopts some freeform surfaces. We discuss the problems we noticed in processes of design, manufacture, measurement and alignment, and the solutions. At last, the periodical research result and the expected performance are given.

关键词： Freeform surfaces aberrations correction off-axis reflective optical system wide FOV

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Reflaxicon objectives for imaging

Reflaxicon objectives for imaging

引用

conference on current developments in lens design and optical engineering XIII

作者： Nadorff, Georg DeWitt, Frank CVI Melles Griot Rochester NY 14620 USA

ISBN: (纸本)9780819492036

We introduce a novel application of reflective axicon surfaces to high performance image-forming objectives. The reflective surfaces are arranged such that the optical and mechanical axes are collinear, yet have the potential to provide unobscured transmission. Offering the ability to compete with the performance of traditional diffraction-limited unobscured optical systems provides a design and fabrication alternative where demanding optical requirements must be met. There are four possible arrangements for construction, with the two outer reflectors always being concave and the two inner reflectors being either concave or convex. Multitudes of novel design forms are explored. We describe monolithic and two-piece solid, two- and three-piece reflective, and two- piece hollow-solid hybrids. We analyze the performance of such designs and compare to the performance of both refractive and reflective systems.

关键词： reflective axicon lens forms objective Schwarzschild obscuration-free obscured long working distance

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