- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2019 IEEE International Conference on Telecommunications and Photonics (ICTP) - Dhaka, Bangladesh (2019.12.28-2019.12.30)] 2019 IEEE International Conference on Telecommunications and Photonics (ICTP) - Four-mode filter for mode division multiplexing optical communication systems
摘要： The Remote Sensing Technology Institute (Institut für Methodik der Fernerkundung) of the German Aerospace Agency (DLR) operates two sensors for airborne hyperspectral imaging, i.e., a Norsk Elektro Optikk A/S (NEO) HySpex VNIR-1600 and a NEO HySpex SWIR-320m-e. Since these sensors are used for the development of physically based inversion algorithms, atmospheric correction algorithms and for calibration/validation activities, their properties need to be characterized in detail, and an accurate calibration is mandatory. The characterization is performed at the calibration laboratory of DLR for imaging spectrometers in Oberpfaffenhofen. Key results of the characterization are assessments of the radiometric, spectral, and geometric performances, including the typical optical distortions prevalent in pushbroom imaging spectrometers, keystone and smile, and the associated measurement uncertainties. Potential sources of systematic error, the detector nonlinearity and the polarization sensitivity are discussed. The radiometric calibration is traceably performed to the German national metrology institute Physikalisch-Technische Bundesanstalt, whereas the spectral measurements can be traced back to the spectral properties of atomic line lamps. The implemented level 0 to level 1 calibration procedure is presented as well.
关键词： hyperspectral,characterization,Calibration,HySpex
更新于2025-09-19 17:13:59
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[IEEE 2019 Twelfth International Conference "Management of large-scale system development" (MLSD) - Moscow, Russia (2019.10.1-2019.10.3)] 2019 Twelfth International Conference "Management of large-scale system development" (MLSD) - Controlled Coherent Effects in Monitoring Processes of Liquid Media
摘要： Several state-of-the-art monitoring and control systems, such as dc motor controllers, power line monitoring and protection systems, instrumentation systems, and battery monitors, require direct digitization of high-voltage (HV) input signals. Analog-to-digital converters (ADCs) that can digitize HV signals require high linearity and low-voltage coefficient capacitors. A built-in self-calibration and digital-trim algorithm correcting static mismatches in capacitive digital-to-analog converter (DAC) used in successive approximation register analog-to-digital converters (SAR ADCs) is proposed. The algorithm uses a dynamic error correction (DEC) capacitor to cancel the static errors occurring in each capacitor of the array as the first step upon power-up and eliminates the need for an extra calibration DAC. Self-trimming is performed digitally during normal ADC operation. The algorithm is implemented on a 14-bit HV input range SAR ADC with integrated DEC capacitors. The IC is fabricated in 0.6-μm HV-compliant CMOS process, accepting up to 24Vpp differential input signal. The proposed approach achieves 73.32-dB signal-to-noise and distortion ratio, which is an improvement of 12.03 dB after self-calibration at 400-kS/s sampling rate, consuming 90 mW from a ±15 V supply. The calibration circuitry occupies 28% of the capacitor DAC and consumes <15 mW during operation. Measurement results show that this algorithm reduces integral nonlinearity from as high as 7 LSBs down to 1 LSB, and it works even in the presence of larger mismatches exceeding 260 LSBs. Similarly, it reduces differential nonlinearity errors from 10 LSBs down to 1 LSB. The ADC occupies an active area of 9.76 mm2.
关键词： digital trimming,mismatch correction,self-calibration,Analog-to-digital (A/D) conversion
更新于2025-09-19 17:13:59
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[IEEE 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Xiamen, China (2019.12.17-2019.12.20)] 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall) - Parallel Computation Technology for Distributed Optical Fiber Sensing System
摘要： The gradual changes that occur in the human voice due to aging create challenges for speaker verification. This study presents an approach to calibrating the output scores of a speaker verification system using the time interval between comparison samples as additional information. Several functions are proposed for the incorporation of this time information, which is viewed as aging information, in a conventional linear score calibration transformation. Experiments are presented on data with short-term aging intervals ranging between 2 months and 3 years, and long-term aging intervals of up to 30 years. The aging calibration proposal is shown to offset the decreased discrimination and calibration performance for both short- and long-term intervals, and to extrapolate well to unseen aging intervals. Relative reductions in C(cid:2)(cid:2)r (cost of log-likelihood ratio) of 1–4% and 10–43% are obtained at short- and long-term intervals, respectively. Assuming that a system has knowledge of the time interval between samples under comparison, this approach represents a straightforward means of compensating for the detrimental impact of aging on speaker verification performance.
关键词： speaker variability,quality measures,Aging,calibration,speaker verification
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Injection-dependent lateral resistance in front-junction solar cells with nc-Si:H and a-Si:H hole selective contact
摘要： The Remote Sensing Technology Institute (Institut für Methodik der Fernerkundung) of the German Aerospace Agency (DLR) operates two sensors for airborne hyperspectral imaging, i.e., a Norsk Elektro Optikk A/S (NEO) HySpex VNIR-1600 and a NEO HySpex SWIR-320m-e. Since these sensors are used for the development of physically based inversion algorithms, atmospheric correction algorithms and for calibration/validation activities, their properties need to be characterized in detail, and an accurate calibration is mandatory. The characterization is performed at the calibration laboratory of DLR for imaging spectrometers in Oberpfaffenhofen. Key results of the characterization are assessments of the radiometric, spectral, and geometric performances, including the typical optical distortions prevalent in pushbroom imaging spectrometers, keystone and smile, and the associated measurement uncertainties. Potential sources of systematic error, the detector nonlinearity and the polarization sensitivity are discussed. The radiometric calibration is traceably performed to the German national metrology institute Physikalisch-Technische Bundesanstalt, whereas the spectral measurements can be traced back to the spectral properties of atomic line lamps. The implemented level 0 to level 1 calibration procedure is presented as well.
关键词： Calibration,HySpex,hyperspectral,characterization
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Sozopol, Bulgaria (2019.9.6-2019.9.8)] 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Monte Carlo Evaluation of the Uncertainty in a Calibrated Instrument
摘要： A Monte Carlo procedure is presented for computing the joint state-of-knowledge probability distribution to be assigned to the parameters of a calibration function. The procedure is fully in line with the approach in Supplement 1 to the Guide to the Expression of Uncertainty in Measurement. It consists of propagating the joint probability distribution of the calibration quantities through the mathematical model of the measurement by which the parameters are defined. Usually this model is derived from a least-squares adjustment procedure. When the instrument is in use, we desire to obtain the probability distribution for the stimulus that corresponds to an indicated response. This goal can be accomplished by propagating the distributions for the parameters of the calibration curve, together with the distribution of the indicated response.
关键词： calibration functions,probability distributions,curve fitting,Monte Carlo method
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Sozopol, Bulgaria (2019.9.6-2019.9.8)] 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Theoretical substantiation and application of CUSUM-charts
摘要： The article presents a theoretical justification and shows the use of CUSUM-charts to identify the process disorder caused by the influence of non-random value. A comparison of the sensitivity of the CUSUM-charts with the overlay of the V-mask and the classical Shewhart charts of the mean values to the setting level offset was made. It’s shown that, unlike the Shewhart charts, CUSUM-charts are more sensitive to small displacements of the process setting level. However, both CUSUM-charts and X-charts have a common drawback – they reveal a process mismatch with some time delay.
关键词： Quality control,sensitivity,CUSUM-charts,V-mask,calibration,control limits,Technological process
更新于2025-09-19 17:13:59
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[IEEE 2019 4th International Conference on Power and Renewable Energy (ICPRE) - Chengdu, China (2019.9.21-2019.9.23)] 2019 4th International Conference on Power and Renewable Energy (ICPRE) - Research on Two-Stage Three-Phase Photovoltaic Grid-Connected System with MPPT
摘要： Several state-of-the-art monitoring and control systems, such as dc motor controllers, power line monitoring and protection systems, instrumentation systems, and battery monitors, require direct digitization of high-voltage (HV) input signals. Analog-to-digital converters (ADCs) that can digitize HV signals require high linearity and low-voltage coefficient capacitors. A built-in self-calibration and digital-trim algorithm correcting static mismatches in capacitive digital-to-analog converter (DAC) used in successive approximation register analog-to-digital converters (SAR ADCs) is proposed. The algorithm uses a dynamic error correction (DEC) capacitor to cancel the static errors occurring in each capacitor of the array as the first step upon power-up and eliminates the need for an extra calibration DAC. Self-trimming is performed digitally during normal ADC operation. The algorithm is implemented on a 14-bit HV input range SAR ADC with integrated DEC capacitors. The IC is fabricated in 0.6-μm HV-compliant CMOS process, accepting up to 24Vpp differential input signal. The proposed approach achieves 73.32-dB signal-to-noise and distortion ratio, which is an improvement of 12.03 dB after self-calibration at 400-kS/s sampling rate, consuming 90 mW from a ±15 V supply. The calibration circuitry occupies 28% of the capacitor DAC and consumes <15 mW during operation. Measurement results show that this algorithm reduces integral nonlinearity from as high as 7 LSBs down to 1 LSB, and it works even in the presence of larger mismatches exceeding 260 LSBs. Similarly, it reduces differential nonlinearity errors from 10 LSBs down to 1 LSB. The ADC occupies an active area of 9.76 mm2.
关键词： self-calibration,digital trimming,Analog-to-digital (A/D) conversion,mismatch correction
更新于2025-09-19 17:13:59
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[IEEE 2019 International Seminar on Research of Information Technology and Intelligent Systems (ISRITI) - Yogyakarta, Indonesia (2019.12.5-2019.12.6)] 2019 International Seminar on Research of Information Technology and Intelligent Systems (ISRITI) - Parameter Tuning of G-mapping SLAM (Simultaneous Localization and Mapping) on Mobile Robot with Laser-Range Finder 360?° Sensor
摘要： The application of a binary step-up method has been investigated at the Korea Research Institute of Standards and Science (KRISS) for establishment of high dc standards based on the calibration system of high dc shunts up to a few thousand amperes in which the current dependence of the shunt resistance can be measured. A successive step-up method with a pair of high dc shunts was suggested to link the unknown high current to the values of low current level which are already known. The step-up approach was further modified with employing a current monitor to extract the information on the current dependence of the shunt and the source current changes during the step-up measurement. To validate the modified step-up technology, a comparison of high dc shunt resistance was carried out with National Research Council (NRC) in which both the KRISS and the NRC results agreed well within the standard deviation of the measurement on the order of about 0.01%.
关键词： current measurement,Calibration,current supplies,current transformers,shunts,electrical resistance measurement
更新于2025-09-19 17:13:59
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Calibration Method of Laser Detection System With Position Sensitive Detector
摘要： The measurement accuracy of the LDS with the PSD is crucial in all the military applications, and hence it is of great benefit to calibrate the LDS with the PSD before use. This work mainly provides two contributions: first, the measurement model of the LDS with installation errors is deduced. Second, a calibration method of the LDS with installation errors is designed with only one independent three-axis turntable. Then, a semiphysical simulation test is launched. Comparing laser angles (cid:2)u and (cid:2)c, which are obtained from the data before and after calibration, we find that the calibration result is close to the reference. The proposed method is promising and, we believe, practical.
关键词： Laser Detection System,Installation Errors,Calibration Method,Position Sensitive Detector
更新于2025-09-19 17:13:59
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A new large-scale posture measurement system based on a six-laser tracer multilateral method
摘要： To realize high-accuracy posture measurement in large scale, a posture measurement system is proposed in this study based on a six-laser multilateral method, mainly composed of six laser tracers and three reflectors—a different number of laser tracers tracks each mirror. But in this state, the system is positive definite, and it cannot achieve the system parameters by self-calibration. To solve this problem, a stepwise calibration method to obtain the system parameters by three-step calibration is presented. Simulations and experiments are carried out to verify the effectiveness of the proposed method. The experimental results show that the posture errors are distributed over [?13.6″, 6.6″] when the measurement range is [5 m, 7 m], which shows that the new measurement system has a high posture measurement accuracy in large scale.
关键词： laser multilateral method,stepwise calibration,large scale,posture measurement,metrology
更新于2025-09-19 17:13:59