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oe1(光电查) - 科学论文

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出版时间
  • 2015
研究主题
  • Calibration process of OSL detectors
  • Iodine-131
  • OSL-BeO
  • Dosimetry of staff and patients
  • Optically Stimulated Luminescence (OSL)
应用领域
机构单位
  • Akdeniz University
316 条数据
?? 中文（中国） ▾

  • [IEEE 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Paris, France (2018.10.14-2018.10.17)] 2018 7th International Conference on Renewable Energy Research and Applications (ICRERA) - Energy Consumption Optimization through Dynamic Simulations for an Intelligent Energy Management of a BIPV Building

    摘要： Having 6500 integrated sensors and a wide network of embedded systems, the ADREAM building can be categorized as one of the prototype smart buildings of France. As needs for intelligent management of energy are growing, the associated project provides a multidisciplinary platform of experimentation, developing solutions for efficient Energy Networks, HVAC Systems, Photovoltaics, and Smart Grids. This paper provides the overview of the project along with three different modeling techniques, simulating the thermal behavior of the building and the functioning of the different energy systems. A thermal model of the building was developed and calibrated for energy consumption analysis and prediction, using the software Pleiades+Comfie. A “black box” model was developed using artificial neural networks for the simulation of energy system parameters and the exploration of efficient control strategies. The last method provides the overview of developing an all-inclusive physical model with equivalent Matlab/Simulink for simulating the global functioning of the building and its HVAC systems. The conclusion addresses the utility of exploring and combining different types of models for optimizing the energy management of Smart Buildings.

    关键词： Simulink,Energy Optimization,Model Calibration,Building Simulation,Smart Building,Pleiades + Comfie,Energy Management

    更新于2025-09-04 15:30:14

  • A Robust and Rapid Camera Calibration Method by One Captured Image

    摘要： A robust and rapid camera calibration method is essential in vision measurement. This paper proposes a camera calibration method using a 2.5-D coding target that requires just a single captured image and is capable of identifying the intrinsic and extrinsic parameters of a camera system simultaneously. The calibration target consists of four fixed planes to which coded patterns are attached. The fixed planes of the target prevent the ill condition that arises in Zhang’s method, and they provide four different homography matrices at the same time. The extrinsic parameters of the cameras are calculated using the geometric constraints of the feature circles on each plane. The coded pattern allows the four planes to be distinguished automatically. The proposed method is first verified by comparison experiments with three classical calibration methods. The results confirm that the proposed method has the greatest accuracy and smallest variance of errors. The influences on the calibration results of geometric parameters such as the dihedral angle and the area ratio of the feature circles are then investigated by systematic experiments. This proposed camera calibration method using a single captured image represents a breakthrough in a camera calibration technology and has a broad potential for application to machine vision and vision measurement.

    关键词： Camera calibration,target,ill-conditioned system,rapid,robust

    更新于2025-09-04 15:30:14

  • [IEEE 2018 IEEE Conference on Virtual Reality and 3D User Interfaces (VR) - Tuebingen/Reutlingen, Germany (2018.3.18-2018.3.22)] 2018 IEEE Conference on Virtual Reality and 3D User Interfaces (VR) - A Calibration Method for Large-Scale Projection Based Floor Display System

    摘要： We propose a calibration method for deploying a large-scale projection-based floor display system. In our system, multiple projectors are installed on the ceiling of a large indoor space like a gymnasium to achieve a large projection area on the floor. The projection results suffer from both perspective distortion and lens distortion. In this paper, we use projector-camera systems, in which a camera is mounted on each projector, with the “straight lines have to be straight” methodology, to calibrate our projection system. Different from conventional approaches, our method does not use any calibration board and makes no requirement on the overlapping among the projections and the cameras’ fields of view.

    关键词： calibration,augmented reality,projector-camera system,lens distortion,Large-scale projection

    更新于2025-09-04 15:30:14

  • Pixels and 3-D Points Alignment Method for the Fusion of Camera and LiDAR Data

    摘要： The fusion of light detection and ranging (LiDAR) and camera data is a promising approach to improve the environmental perception and recognition for intelligent vehicles because of the combination of depth and color information. One of the dif?culties in achieving the fusion is the accurate alignment of the 3-D points with the image pixels. Current methods of data alignment involve the steps of estimating the camera intrinsic parameters and developing a transformation matrix between the camera and LiDAR frame. The drawback of these methods is the accumulation of errors during the calculation of the camera intrinsic parameters and the transformation matrix. In order to improve the data alignment accuracy, we propose a novel algorithm that directly calculates the alignment between the 3-D points and the pixels without the need for camera parameters and calibration of the coordinate transformation matrix. We call the proposed method the pixel and 3-D point alignment (PPA) method. The alignment procedure is achieved by using the extracted corresponding points. First, we calculate a linear alignment matrix without considering the image distortion; and second, we optimize the parameters using the maximum likelihood estimation to consider the camera distortion. Simulation and experimental results indicate that the PPA method is able to align the 3-D points in LiDAR frame with the pixels in image frame with higher accuracy and increased robustness against noise in calibration process than comparable state-of-the-art methods.

    关键词： intelligent vehicle,sensor fusion.,calibration,camera and light detection and ranging (LiDAR),Autonomous driving

    更新于2025-09-04 15:30:14

  • Simultaneous All-Parameters Calibration and Assessment of a Stereo Camera Pair Using a Scale Bar

    摘要： Highly accurate and easy-to-operate calibration (to determine the interior and distortion parameters) and orientation (to determine the exterior parameters) methods for cameras in large volume is a very important topic for expanding the application scope of 3D vision and photogrammetry techniques. This paper proposes a method for simultaneously calibrating, orienting and assessing multi-camera 3D measurement systems in large measurement volume scenarios. The primary idea is building 3D point and length arrays by moving a scale bar in the measurement volume and then conducting a self-calibrating bundle adjustment that involves all the image points and lengths of both cameras. Relative exterior parameters between the camera pair are estimated by the five point relative orientation method. The interior, distortion parameters of each camera and the relative exterior parameters are optimized through bundle adjustment of the network geometry that is strengthened through applying the distance constraints. This method provides both internal precision and external accuracy assessment of the calibration performance. Simulations and real data experiments are designed and conducted to validate the effectivity of the method and analyze its performance under different network geometries. The RMSE of length measurement is less than 0.25 mm and the relative precision is higher than 1/25,000 for a two camera system calibrated by the proposed method in a volume of 12 m × 8 m × 4 m. Compared with the state-of-the-art point array self-calibrating bundle adjustment method, the proposed method is easier to operate and can significantly reduce systematic errors caused by wrong scaling.

    关键词： scale bar,relative orientation,self-calibration,stereo photogrammetry,3D vision

    更新于2025-09-04 15:30:14

  • Comprehensive Remote Sensing || Geometric Processing: Active Sensor Modeling and Calibration (LiDAR)

    摘要： The main concept of laser ranging is facilitating the estimation of the distance between the laser beam firing point and its footprint. For time-of-flight systems (ToF), whether pulse-based or phase-shift-based systems, the range is evaluated through the estimation of the time lapse between laser emission and reception. This time when coupled with the speed of the laser beam provides an estimate of the distance between the laser beam firing point and its footprint. One should note that this chapter is not concerned with triangulation-based ranging systems that are comprised of an integrated laser and camera system—that is, the range is estimated using an accurately estimated relative relationship between the laser and camera units.

    关键词： system calibration,LiDAR,point cloud,laser ranging,time-of-flight

    更新于2025-09-04 15:30:14

  • Efficiency calibration of HPGe detector in a PGNAA system for the measurement of aqueous samples

    摘要： In this work, a method was proposed for e?ciency calibration of HPGe detector employed in a prompt gamma-ray neutron activation analysis (PGNAA) system for large aqueous sample analysis. Experimental measurements of a reference surface gamma-ray source were combined with e?ciency transfer method to obtain e?ciency of a volumetric source. Then e?ciency curve over the energy range 0.5–8.5 MeV were determined with prompt gamma-rays of chlorine. To evaluate the performance of the calibration curve, an internal standard method was used to determine the aqueous sample containing manganese based on the calibration curve. The 7.058 MeV and 7.243 MeV manganese gamma-ray peaks were used to calculate the mass of manganese. The relative deviations of calculated values and actual value were 5.0% and 6.5%, respectively.

    关键词： Prompt gamma-ray neutron activation analysis,E?ective solid angle,Large volumetric sample,Gamma-ray e?ciency calibration

    更新于2025-09-04 15:30:14

  • Charge measurement of cosmic ray nuclei with the plastic scintillator detector of DAMPE

    摘要： One of the main purposes of the DArk Matter Particle Explorer (DAMPE) is to measure the cosmic ray nuclei up to several tens of TeV or beyond, whose origin and propagation remains a hot topic in astrophysics. The Plastic Scintillator Detector (PSD) on top of DAMPE is designed to measure the charges of cosmic ray nuclei from H to Fe and serves as a veto detector for discriminating gamma-rays from charged particles. We propose in this paper a charge reconstruction procedure to optimize the PSD performance in charge measurement. Essentials of our approach, including track finding, alignment of PSD, light attenuation correction, quenching and equalization correction are described detailedly in this paper after a brief description of the structure and operational principle of the PSD. Our results show that the PSD works very well and almost all the elements in cosmic rays from H to Fe are clearly identified in the charge spectrum.

    关键词： Charge measurement,Cosmic rays,Calibration

    更新于2025-09-04 15:30:14

  • [Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Base Station Antenna Array with Calibration Structure

    摘要： The introduction of 5G technologies is pushing research in mobile communications to millimeter waves. However, sub-6 GHz frequency range as a part of the 5G standard provides excellent wave propagation properties and more capacity due to new usable frequency ranges. This paper introduces a design for picocell base station 2x2 antenna array with integrated signal injection network for transceiver calibration. Operation frequency range is from 2 to 6 GHz. The antenna array with calibration board has better than -6.3 dB active reflection coefficient and efficiency higher than -3 dB. Calibration network provides 29 dB coupling.

    关键词： sub-6 GHz,Base station,calibration network,mobile communications,beamforming

    更新于2025-09-04 15:30:14

  • [Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Automotive Radar and Radome Calibration to Improve the Direction of Arrival Detection Performance

    摘要： An assessment of the improvement in the Direction of Arrival (DoA) measurements in automotive radar sensor by joint calibration of the radar sensor plus the radome is presented. Nowadays, radar sensors are calibrated before the radome-emblem assembly. This makes radar sensors more vulnerable to the errors induced by the radome-emblems. This new approach is based on the idea of calibrating the radar sensor with the radome to improve the determination of the Direction of Arrival (DoA) and consequently reduce the angle error.

    关键词： Calibration,Radar Sensor,Angle Error,Radome,Direction of Arrival,DoA

    更新于2025-09-04 15:30:14