- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 9th International Conference on Awareness Science and Technology (iCAST) - Fukuoka (2018.9.19-2018.9.21)] 2018 9th International Conference on Awareness Science and Technology (iCAST) - Psychological Effect of Telescope Virtual Screens using VR Headset
摘要： We carried out a psychological experiment using Virtual Reality Head Mount Display (VR-HMD) with small FOV (Field of view) camera and a screen in virtual environment, telescope virtual screen, to analyze the change of subjects’ pain tolerance. We manipulate FOV of the virtual camera in VR to change the view of contents. Decreasing FOV makes view of angle narrow, therefore the view in VR looks similar to the one using telephoto lens, in which environment the view greatly moves with even small camera movement. With smaller value of FOV for a virtual camera, the view in VR is more sensitive to VR-HMD movement and requires subjects to keep concentrating not to move their heads to watch target properly. Hand immersion into cold water is a standard test for pain tolerance evaluation and is known as the cold pressor test. Cold pressor test with the VR-HMD shows that pain tolerance was increased with telescope virtual screen environment. The result indicates that pain tolerance can be controlled with VR-HMD without meaningful contents. The contents independent pain management technique can potentially be used in various applications especially in medical field.
关键词： Cold pressor test,VR,Psychology,FOV,Tolerance
更新于2025-09-23 15:22:29
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A waveguide imaging platform for livea??cell TIRF imaging of neurons over large fields of view
摘要： Large fields of view (FOVs) in total internal reflection fluorescence microscopy (TIRFM) via waveguides have been shown to be highly beneficial for single molecule localisation microscopy on fixed cells [1, 2] and have also been demonstrated for short-term live-imaging of robust cell types [3-5], but not yet for delicate primary neurons nor over extended periods of time. Here, we present a waveguide-based TIRFM set-up for live-cell imaging of demanding samples. Using the developed microscope, referred to as the ChipScope, we demonstrate successful culturing and imaging of fibroblasts, primary rat hippocampal neurons and axons of Xenopus retinal ganglion cells (RGCs). The high contrast and gentle illumination mode provided by TIRFM coupled with the exceptionally large excitation areas and superior illumination homogeneity offered by photonic waveguides have potential for a wide application span in neuroscience applications.
关键词： live-cell imaging,TIRFM,neurons,large FOV,waveguide
更新于2025-09-23 15:19:57
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[IEEE 2019 13th International Conference on Sensing Technology (ICST) - Sydney, Australia (2019.12.2-2019.12.4)] 2019 13th International Conference on Sensing Technology (ICST) - Design and Development of an IoT enabled Pedestrian Counting and Environmental Monitoring System for a Smart City
摘要： A novel method for pedestrian counting using passive infrared (PIR) sensors is proposed and the corresponding system has been designed and developed. The inclusion of an environmental combo sensor in the proposed pedestrian counting system enabled environmental monitoring such as temperature, humidity, pressure, Carbon di Oxide (CO2) and Total Volatile Organic Component (TVOC). The detection lengths of the PIR sensors are varied by tuning the Field of View (FoV) of the Fresnel lens to differentiate the movements of humans and animals. A novel method is applied to locate the PIR sensors in the designed mould so that their coverage regions do not overlap. The sensor data are transmitted to the Thingspeak server via Long Range Wide Area Network (LoRaWAN) communication protocol. The system is powered by a 6000 mAh rechargeable battery which is charged by the solar panel during day time enabling continuous data collection. The system’s results are validated against manual counting and it is seen that more than 90% accuracy can be achieved by this intelligent system.
关键词： PIR sensors,pedestrian count,environmental monitoring,smart city,FoV
更新于2025-09-23 15:19:57
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[IEEE 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC) - Fukuoka, Japan (2019.7.7-2019.7.11)] 2019 24th OptoElectronics and Communications Conference (OECC) and 2019 International Conference on Photonics in Switching and Computing (PSC) - Plasmonics for Communications
摘要： The Global Change Observation Mission 1st-Water (GCOM-W1) satellite, launched by the Japan Aerospace Exploration Agency in May 2012, contains an Advanced Microwave Scanning Radiometer-2 (AMSR2). The AMSR2 provides multifrequency measurements of microwave energy (brightness temperature) emitted by the Earth’s surface and atmosphere. However, each frequency field of view (FOV) differs in size because of its hardware design. For the retrieval of more accurate geophysical parameters from multifrequency brightness temperatures, the brightness temperatures should be modified to be the same as measured in the same FOV. The Backus–Gilbert (BG) method is one of the antenna pattern matching techniques used for this modification. We applied the BG method to the AMSR2 data to define a new data set of modified brightness temperatures, a level 1R (L1R) product that is freely and widely available. We optimized the implementation of the BG method to obtain the L1R product, with smoothing factors dynamically determined for all modified brightness temperatures. This paper describes the implementation method, including the criterion used to determine the smoothing factors and presents a quality assessment of the L1R product.
关键词： Backus–Gilbert (BG) method,water cycle monitoring,microwave radiometer,convolution,field of view (FOV),Advanced Microwave Scanning Radiometer-2 (AMSR2)
更新于2025-09-23 15:19:57
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[IEEE 2018 28th International Telecommunication Networks and Applications Conference (ITNAC) - Sydney, Australia (2018.11.21-2018.11.23)] 2018 28th International Telecommunication Networks and Applications Conference (ITNAC) - Analysis of the effects of multiple reflection paths on high speed VLC system performance
摘要： In the recent past, research in visible light communication (VLC) has gained a lot interest due to its distinct characteristics in supporting high-speed data transmission and illumination simultaneously. To implement a reliable VLC system, few parameters have to be considered for communication channels such as distance between transmitter and receiver, data rate, line of sight (LOS) and non-line of sight (NLOS) communication paths, signal power and delay of the channel. In this paper, we designed and simulated a LOS and NLOS multipath VLC model using single and multiple LEDs. Basic on-off keying (OOK) modulation scheme and available conventional LED configuration have been considered to analyze the effects of field of view (FOV) and the reflection of the light signal on received power level. Moreover, BER and quality of transmission were measured for single and multipath transmissions considering distance, incident and irradiance angles.
关键词： BER,LED refraction,Visible Light Communication,multi-channel,FOV,irradiance and incident angle
更新于2025-09-19 17:15:36
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Optimal Design Strategy of Non-Abelian Geometric Phases Based on Quantum Metric
摘要： The Global Change Observation Mission 1st-Water (GCOM-W1) satellite, launched by the Japan Aerospace Exploration Agency in May 2012, contains an Advanced Microwave Scanning Radiometer-2 (AMSR2). The AMSR2 provides multifrequency measurements of microwave energy (brightness temperature) emitted by the Earth’s surface and atmosphere. However, each frequency field of view (FOV) differs in size because of its hardware design. For the retrieval of more accurate geophysical parameters from multifrequency brightness temperatures, the brightness temperatures should be modified to be the same as measured in the same FOV. The Backus–Gilbert (BG) method is one of the antenna pattern matching techniques used for this modification. We applied the BG method to the AMSR2 data to define a new data set of modified brightness temperatures, a level 1R (L1R) product that is freely and widely available. We optimized the implementation of the BG method to obtain the L1R product, with smoothing factors dynamically determined for all modified brightness temperatures. This paper describes the implementation method, including the criterion used to determine the smoothing factors and presents a quality assessment of the L1R product.
关键词： Backus–Gilbert (BG) method,water cycle monitoring,microwave radiometer,convolution,field of view (FOV),Advanced Microwave Scanning Radiometer-2 (AMSR2)
更新于2025-09-19 17:13:59
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Spoof plasmonic metasurfaces with catenary dispersion for two-dimensional wide-angle focusing and imaging
摘要： Despite tremendous efforts have been devoted to investigating the analogy between the surface plasmon polariton and its spoof counterparts, it remains elusive that a single thin spoof plasmonic metalens realize wide-angle focusing and wide field-of-view (FOV) imaging. Here, we propose a spoof plasmonic metasurface that can impart arbitrary phase with high transmittance, which is comprised of two-dimensional (2D) gradient spoof-insulator-spoof waveguides. With the developed catenary field and dispersion theory, their intrinsic physics are theoretically analyzed. As a proof of concept, a spoof plasmonic metalens with a thickness of 0.15λ has been elaborately designed and experimentally demonstrated for wide-angle (~170°) focusing and wide FOV (~40°) imaging. To the best of our knowledge, it is the first experimental demonstration of wide FOV imaging of a 2D object with single thin and planar metalens in the microwave regime. The proposed method offers a promising solution to compact cameras, integrated imaging, and detection systems.
关键词： catenary dispersion,microwave regime,spoof plasmonic metasurfaces,wide-angle focusing,wide FOV imaging
更新于2025-09-19 17:13:59
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[IEEE 2018 11th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT) - HangZhou, China (2018.9.5-2018.9.7)] 2018 11th UK-Europe-China Workshop on Millimeter Waves and Terahertz Technologies (UCMMT) - Nondestructive testing of deterioration for Yungang Grottoes based on THz-TDS
摘要： The Global Change Observation Mission 1st-Water (GCOM-W1) satellite, launched by the Japan Aerospace Exploration Agency in May 2012, contains an Advanced Microwave Scanning Radiometer-2 (AMSR2). The AMSR2 provides multifrequency measurements of microwave energy (brightness temperature) emitted by the Earth’s surface and atmosphere. However, each frequency field of view (FOV) differs in size because of its hardware design. For the retrieval of more accurate geophysical parameters from multifrequency brightness temperatures, the brightness temperatures should be modified to be the same as measured in the same FOV. The Backus–Gilbert (BG) method is one of the antenna pattern matching techniques used for this modification. We applied the BG method to the AMSR2 data to define a new data set of modified brightness temperatures, a level 1R (L1R) product that is freely and widely available. We optimized the implementation of the BG method to obtain the L1R product, with smoothing factors dynamically determined for all modified brightness temperatures. This paper describes the implementation method, including the criterion used to determine the smoothing factors and presents a quality assessment of the L1R product.
关键词： field of view (FOV),water cycle monitoring,convolution,microwave radiometer,Backus–Gilbert (BG) method,Advanced Microwave Scanning Radiometer-2 (AMSR2)
更新于2025-09-19 17:13:59
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How big is an OMI pixel?
摘要： The Ozone Monitoring Instrument (OMI) is a push-broom imaging spectrometer, observing solar radiation backscattered by the Earth’s atmosphere and surface. The incoming radiation is detected using a static imaging CCD (charge-coupled device) detector array with no moving parts, as opposed to most of the previous satellite spectrometers, which used a moving mirror to scan the Earth in the across-track direction. The field of view (FoV) of detector pixels is the solid angle from which radiation is observed, averaged over the integration time of a measurement. The OMI FoV is not quadrangular, which is common for scanning instruments, but rather super-Gaussian shaped and overlapping with the FoV of neighbouring pixels. This has consequences for pixel-area-dependent applications, like cloud fraction products, and visualisation. The shapes and sizes of OMI FoVs were determined pre-flight by theoretical and experimental tests but never verified after launch. In this paper the OMI FoV is characterised using collocated MODerate resolution Imaging Spectroradiometer (MODIS) reflectance measurements. MODIS measurements have a much higher spatial resolution than OMI measurements and spectrally overlap at 469 nm. The OMI FoV was verified by finding the highest correlation between MODIS and OMI reflectances in cloud-free scenes, assuming a 2-D super-Gaussian function with varying size and shape to represent the OMI FoV. Our results show that the OMPIXCOR product 75FoV corner coordinates are accurate as the full width at half maximum (FWHM) of a super-Gaussian FoV model when this function is assumed. The softness of the function edges, modelled by the super-Gaussian exponents, is different in both directions and is view angle dependent. The optimal overlap function between OMI and MODIS reflectances is scene dependent and highly dependent on time differences between overpasses, especially with clouds in the scene. For partially clouded scenes, the optimal overlap function was represented by super-Gaussian exponents around 1 or smaller, which indicates that this function is unsuitable to represent the overlap sensitivity function in these cases. This was especially true for scenes before 2008, when the time differences between Aqua and Aura overpasses was about 15 min, instead of 8 min after 2008. During the time between overpasses, clouds change the scene reflectance, reducing the correlation and influencing the shape of the optimal overlap function.
关键词： OMI,correlation,MODIS,reflectance,super-Gaussian,FoV
更新于2025-09-09 09:28:46