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A New calibration algorithm Using Reference Materials for the Waveguide-Penetration Method

IEICE TRANSACTIONS ON COMMUNICATIONS 2011年第9期E94B卷 2549-2557页

作者： Kik, Alfred Nishikata, Atsuhiro Tokyo Inst Technol Tokyo 1528552 Japan

The waveguide-penetration method is a method to measure the electrical properties of materials. In this method, a cylindrical object pierces a rectangular waveguide through a pair of holes at the centre of its broad walls. Then, the complex permittivity and permeability of the object are estimated from measured S-parameters after TRL calibration. This paper proposes a new calibration algorithm for the waveguide-penetration method. Reference materials with known electrical properties are fabricated in cylindrical shapes to fit into the holes in the waveguide and are used as calibration standards. The algorithm is formulated using the property of equal traces in similar matrices, and we show that at least two reference materials are needed to calibrate the system. The proposed algorithm yields a simpler means of calibration compared to TRL and is verified using measurements in the S-band. Also, the error sensitivity coefficients are derived. These coefficients give valuable information for the selection of reference materials.

关键词： permittivity measurement permeability measurement waveguide transmission-line method vector network analyzer (VNA) calibration algorithm reference material error analysis

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A 70.7-dB SNDR 100-kS/s 14-b SAR ADC with attenuation capacitance calibration in 0.35-μm CMOS

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ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING 2016年第2期89卷 357-371页

作者： Brenna, Stefano Bonfanti, Andrea Lacaita, Andrea Leonardo Politecn Milan Dipartimento Elettron Informaz & Bioingn Via Golgi 40 I-20133 Milan Italy Intel Labs 2111 NE 25th Ave Hillsboro OR 97124 USA

In sensor applications, low-power and moderate-high resolution analog-to-digital converters (ADCs) are needed to convert the analog front-end signal output. Such systems are often multi-channel and require analog multiplexing. In these cases, even when high resolutions are required, continuous time Delta Sigma ADCs can't be adopted, and an efficient data-conversion must be achieved relying on different topologies, typically successive approximation-register (SAR) ADCs. Since these systems are often implemented in CMOS processes like 250- and 350-nm CMOS to benefit from a large supply voltage, the SAR ADC design is challenging due to the technology mismatch and to the limited number of metals available to optimize the layout. This paper presents a SAR ADC implemented in 350-nm CMOS technology with a physical resolution of 14 bits using a binary weighted with attenuation capacitor array. The proposed converter exploits a semi-custom and isotropic unit capacitance with ground shield to avoid proximity effects and parasitic capacitances across its terminals, an optimized capacitive array layout insensitive to both linear and radial oxide gradients, and an efficient calibration algorithm to compensate the parasitic capacitances that worsen the converter linearity. At 1.8-V supply and 100-kSps sampling frequency, the proposed ADC achieves an SNDR of 70.7 dB, an SFDR of 81.8 dB, an ENoB of 11.45 and a power consumption of 43.4 mu W, corresponding to a figure-of-merit (FoM) of 155 fJ/conv.-step. To the best of our knowledge, this figure is the best among SAR converters implemented in 350-nm or less scaled technologies, and in-line with other ADCs featuring an SNDR larger than 70 dB.

关键词： ADC Analog-to-digital conversion Nonlinearity Mismatch Asynchronous logic Successive approximation register calibration algorithm

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Accuracy of the Sof-sensor glucose sensor with the iPro calibration algorithm

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Journal of diabetes science and technology 2012年第2期6卷 475-6页

作者： John B Welsh Francine R Kaufman Scott W Lee Medtronic Inc. Northridge California

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Consideration of Environmental and Functional Factors in calibration of Antenna Integrated Active Phased Array Transmitters

Consideration of Environmental and Functional Factors in Cal...

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IEEE International Symposium on Phased Array Systems and Technology (PAST)

作者： Temir, Kaan Akyuz, Murat Sencer Alp, Yasar Kemal Aselsan AS Phased Array Technol Dept Ankara Turkey

ISBN: (纸本)9781509014477

When dealing with direct calibration in phased array systems, in which power amplifier (PA) output for each antenna element is measured with respect to all phase and amplitude levels, several issues complicate the calibration algorithm and extend calibration time, such as wide frequency band, large element number, temperature changes, driving power of PAs. In this work, all realizable aspects effecting direct calibration of multi-octave band phased array system with 100+ elements are examined and a robust and consistent algorithm is developed and applied.

关键词： phased array calibration phase error amplitude error calibration algorithm Monte-Carlo analysis

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Research on displacement measurement of disk vibration based on machine vision technique

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OPTIK 2016年第8期127卷 4173-4177页

作者： Tang, Wusheng Tian, Lihong Zhao, Xilu Changchun Univ Sch Mech & Vehicle Engineer Changchun Peoples R China Changchun Univ Sch Continuing Educ Changchun Peoples R China Saitama Inst Technol Japan Fukaya Japan

The paper proposes a new measurement of displacement based on machine vision technique. It ingeniously makes good use of principle of camera calibration and realizes non-contact measurement of disk vibration. There are mainly two parts during the whole process: first, the intrinsic parameters of the camera used are measured by means of highly precise calibration target, and then the extrinsic parameters of disk are obtained by camera. The displacement variation of the feature points on Z axis will be calculated by extrinsic parameters and the vibration displacement can be acquired by conversion of world coordinates with camera coordinates. Compared with previous methods, it can simultaneously obtain vibration displacement of many feature points on the disk, increase the efficiency and precision of measurement with simple and economic apparatus and wide range of application, thus a convenient, feasible and non-contact displacement measurement. (C) 2016 Elsevier GmbH. All rights reserved.

关键词： Camera calibration calibration algorithm Disk vibration Measurement

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Optimized Study of Polarization Technique - Imaging Sensors 3

Optimized Study of Polarization Technique - Imaging Sensors

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3rd International Conference on Computing for Sustainable Global Development (INDIACom)

作者： Chawla, Dimple Passi, Lipi Delhi Inst Adv New Delhi India Delhi Inst Adv Studies Studies New Delhi India

ISBN: (纸本)9789380544199

In today's smart world of people images are also gathering good hand in the field of technology. Image Processing is a compressed set of operation of different types of visualization and their virtual analysis. It supports multi-programmed processors, VPUs, and C-programmed generation. Polarization or called it as silicon polarised filters is the upcoming technique for creating the illusion of three-dimensional images by restricting the light that reaches each eye. The emerging concept of Polarization involves light, radiation, or magnetism moving in specific directions. It basically converts a beam of light of undefined or mixed polarization into a beam with well-defined polarization, polarized light. The motivate behind this paper is to analysis the various types of implemented algorithm and proposed optimized algorithm according to new innovative technology and also improving the clarity and recovery of colors in high definition colour-cromed images.

关键词： Polaroided filter Dehasing Law Maxwell Law Fresnel-Arago Law Brewster's Law Malus Law OCT GNSS POLNS calibration algorithm OCDSA PRA

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A Weighted Estimation algorithm for Food Transporting Magnetic Compass

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Advance Journal of Food Science and Technology 2016年第7期11卷 499-505页

作者： W. G. Feng S. B. Liu S. L. Yang B. Guo X. W. Hou School of Electronics and Information Northwestern Polytechnical University Xi

In this study, a weighted estimation algorithm is proposed for food transporting two-axis magnetic compass. This method is based on ellipse fitting algorithm and compensates the combined effort of all linear time-invariant distortions, namely bias, scale factor, hard iron, non-orthogonality and so on. In contrast to the direct ellipse fitting method for estimating ellipse coefficient, which achieves best estimate based on minimizing the mean square algebraic distance from collected data points to ellipse in mathematical model, this procedure presents a new estimator in least-square sense where the weighted approximate distance is presented. The algorithm is simulated to verify robustness and further validated on collected experimental data using a low-cost fluxgate compass. The results indicate that the calibration algorithm is effective and superior to the direct ellipse fitting method, the heading error after calibration is less than.

关键词： calibration algorithm ellipse fitting food magnetic compass weighted approximate distance

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FY-3C中分辨率光谱成像仪在轨红外辐射定标分析

FY-3C中分辨率光谱成像仪在轨红外辐射定标分析

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2016年红外、遥感技术与应用研讨会暨交叉学科论坛

作者：赵其昌代海山王冲杨勇杨春燕郭玲玲上海卫星工程研究所

利用星载高精度黑体对遥感仪器的红外通道进行辐射定标是常用的定标方法。本文介绍了中分辨率光谱成像仪在轨红外辐射定标原理,利用仪器每个扫描周期独立获取冷空间和内部黑体计数值,进行红外通道在轨定标计算。重点论述了红外辐射定标... 详细信息

利用星载高精度黑体对遥感仪器的红外通道进行辐射定标是常用的定标方法。本文介绍了中分辨率光谱成像仪在轨红外辐射定标原理,利用仪器每个扫描周期独立获取冷空间和内部黑体计数值,进行红外通道在轨定标计算。重点论述了红外辐射定标算法,并对定标结果进行分析。

关键词： Medium Resolution Spectral Imager infrared radiometric calibration algorithm

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High-accuracy online calibration system for electronic voltage transformers with digital output

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TRANSACTIONS OF THE INSTITUTE OF MEASUREMENT AND CONTROL 2014年第6期36卷 734-742页

作者： Li, Zhenhua Li, Hongbin Zhang, Zhi Luo, Pandian Li, Hongfeng Zhang, Wenlu SEEE Huazhong Univ Sci & Technol Wuhan 430074 Peoples R China State Key Lab Adv Elect Engn & Technol Wuhan Peoples R China

The accuracy and stability of electronic transformers (ETs) is the guarantee of the safe and reliable operation of a power system. As an emerging technology, however, the ETs' failure rate is higher than that of traditional transformers. As a result, the calibration period should be shortened. Existing calibration methods address the verification on condition that the ETs and lines are powered off, which has a long calibration period and results in a power-off loss. As a result, an online calibration system for electronic voltage transformers (EVTs) is proposed in this paper. Employing a specially designed standard voltage online measuring unit, the proposed system can obtain the high voltage signals without powering off and do the calibration when the EVTs are working. The power-off loss can be avoided, and problems of the running EVTs can be detected in time. The main factors influencing the system accuracy are addressed. The system has been validated by the Quality Inspection and Testing Center of the China Electric Power Research Institute, and field tests have been conducted in Guizhou Electric Power Company. The results show that the proposed system has good reliability and can reach an accuracy class of 0.05 in complicated electromagnetic circumstances.

关键词： calibration algorithm digital output online calibration synchronization voltage transformer

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Thermal imager sources of non-uniformities: modeling of static and dynamic contributions during operations.

Thermal imager sources of non-uniformities: modeling of stat...

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Conference on Infrared Imaging Systems - Design, Analysis, Modeling, and Testing XXV

作者： Sozzi, B. Olivieri, M. Mariani, P. Giunti, C. Zatti, S. Porta, A. Selex ES SpA I-50013 Campi Bisenzio FI Italy

ISBN: (纸本)9781628410082

Due to the fast-growing of cooled detector sensitivity in the last years, on the image 10-20 mK temperature difference between adjacent objects can theoretically be discerned if the calibration algorithm (NUC) is capable to take into account and compensate every spatial noise source. To predict how the NUC algorithm is strong in all working condition, the modeling of the flux impinging on the detector becomes a challenge to control and improve the quality of a properly calibrated image in all scene/ambient conditions including every source of spurious signal. In literature there are just available papers dealing with NU caused by pixel-to-pixel differences of detector parameters and by the difference between the reflection of the detector cold part and the housing at the operative temperature. These models don't explain the effects on the NUC results due to vignetting, dynamic sources out and inside the FOV, reflected contributions from hot spots inside the housing (for example thermal reference far of the optical path). We propose a mathematical model in which: 1) detector and system (opto-mechanical configuration and scene) are considered separated and represented by two independent transfer functions 2) on every pixel of the array the amount of photonic signal coming from different spurious sources are considered to evaluate the effect on residual spatial noise due to dynamic operative conditions. This article also contains simulation results showing how this model can be used to predict the amount of spatial noise.

关键词： non-uniformities opto-mechanical system dynamic sources spurious sources calibration algorithm

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