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A CMOS digital temperature measurement technique is reported, which doesn't require an explicit reference voltage during temperature to digital conversion. Instead, one of the inputs from the sensor core serves as the reference. After eliminating the need to use an external reference, we observe at least twofold increase in temperature estimation accuracy compared to the reference based traditional...
Ethylene is one of the important signature gases in spontaneous combustion forecasting of coal goaf area. It is very important to detect the concentration of ethylene accurately. However, the absorption spectrum of the other interfering gases is always in the ethylene spectrum during the ethylene detecting, which has a great impact on the ethylene's accuracy. In this paper, a spectral correction method...
An algorithm for volumetric calibration is developed and verified practically by measuring of all geometric errors after numerical compensation. In this paper, analysis of the contribution of each of 9 translational and 9 rotational position dependent errors and each of 3 position independent errors in total displacement error vector is presented. Changing only one of the errors, and keeping all the...
The Thermal InfraRed Sensor (TIRS), an infrared (IR) radiometer developed at Centro de Astrobiología, is one the sensors that compose the Mars Environmental Dynamics Analyzer (MEDA) onboard NASA's Mars 2020 mission. It will measure the net thermal infrared radiation, reflected solar radiation at the surface, atmosphere temperature and surface skin brightness temperature using five different channels...
Traditional manufacturing processes of 3D force platform (three-dimensional force platform) are purchasing of three dimensional force sensor, calibrating of sensor in specialized agencies and building up with platform table and base. However, due to processing accuracy and installation error, the method of calibration before building up cannot guarantee the global accuracy of 3D force platform, and...
Quality assurance (QA) is a crucial process to ensure the maximize accuracy of the data delivered to client. Equipped with many moving parts whose relative positions can change over time depending on use, handling frequency and care, the QA is essential for TLS. Furthermore, with rapid and dense three-dimensional (3D) data collection ability, TLS has gain interest for many accurate 3D applications...
Japan Meteorological Agency (JMA) Himawari-8 Advanced Himawari Imager (AHI) is the first in the series of next-generation geostationary (GEO) weather instruments. It has 16 spectral solar reflective and emissive bands located in three focal plane modules (FPM): one visible and near-infrared (VNIR) FPM, one midwave infrared (MWIR) FPM, and one longwave infrared (LWIR) FPM. All the AHI bands are geo-spatially...
Energy consumption in Cloud computing is a significantissue and affects aspects such as the cost of energy, coolingin the data center and the environmental impact of cloud data centers. Monitoring and prediction provides the groundwork for improving the energy efficiency of data centers. This monitoring however is required to be fast and efficient without unnecessary overhead. It is also required...
From first-order incremental ΣΔ converters to controlled-oscillator-based converters, many ADC architectures are based on the continuous-time integration of the input signal. However, the accuracy of such converters cannot be properly estimated without establishing the impact of noise. In fact, noise is also integrated, resulting in a random error that is added to the measured value. Since drifting...
We, DAIHEN Corporation, have developed a real-time power and impedance sensor that enables real-time measurement of transmitted power and coil impedance in a kW class wireless power transfer during practical power transfer. Normally, accurate power measurement is assured only for characteristic impedance in which the reflected power is zero. However, the sensor we developed enables highly accurate...
This paper represents a study of the context of improvement the parallel robots accuracy. We introduced, in the first hand, the different reasons of inaccuracy according to the different references mentioned in our paper as well as the methods used for the calibration and the accuracy improvement. In the other hand, we detailed the description of the direct and inverse geometric modeling of a biped...
The research focuses on high precision airborne SAR geometric calibration (GC) and geolocation (GL) on the condition of long flight time. The experiment was conducted in Inner Mongolia, China, and based on image pixels' GL model, calibration parameters and procedure proposed in literature [1], two systematic parameters (near range R0 and slant range resolution ρr) were calculated and validated. But,...
Silicone impression-taking of teeth is an established but inefficient technique for computer-aided manufacturing of dental prosthetics. Hence, intra-oral scanners based on optical technologies have been developed to optimize the process of impressioning and to enable a complete chairside workflow. However, during the scan, the presence of blood or saliva can cause critical model defects and the need...
A SAR system has to be calibrated for quantitative measurement. During this process all essential parameters of a SAR image are linked to their geophysical quantity. This includes the location of the image pixel, its backscattering characteristics (in amplitude and in phase) and polarimetric information. The Microwave and Radar Institute of the DLR has gained a lot of experience in these calibration...
This paper describes a method for extrinsic sensor calibration for a 2D laser profile sensor on a robot arm used as a robot based 3D scanning system. In order to establish a relationship between the sensor measurements and the robot positions, the transformation between the robot flange and the sensor reference frame are determined. The developed calibration method is implemented as an automated self-calibration...
Practical models of lithographic processes are usually empirically calibrated, making their accuracy dependent on the total number of samples used to build the models, and more specifically on the selection of a representative set of samples for calibration. An inadequate number of samples can adversely impact model accuracy, but a broadly comprehensive set will excessively increase measurement cost...
This paper describes a crosstalk calibration and cancellation technique to achieve high precision power measurement using general single-ended analog to digital converter (ADC). Two crosstalk scenarios, in-phase and out-of-phase with the interfering source in multiple signal channels are discussed. Systematic approaches to characterize crosstalk effects are discussed. A calibration procedure to obtain...
Previous studies for measuring the high direct voltage focused on the resistive voltage divider or the hall voltage sensor. The cost of the hall voltage sensor is expensive and additional shielding method must be taken into account when using the voltage divider. In this paper, resistive voltage divider, integrated operational amplifiers and photocouplers are used cooperatively to design the 1kV DC...
Conventional perspective cameras have been used before to create 3D camera systems. However, these systems are hindered by the field of view of the cameras, which limit the angle of the scene that can be reconstructed. Augmenting these systems to larger reconstructed scene angle requires more cameras or increasing the field of view of the cameras. A 3D camera system is introduced which utilizes omnidirectional...
This paper describes a possible usage of Radio Frequency Identification as a mean of asset localisation. The development of the working solution of asset localisation system based on the Radio Frequency Identification measured distance between the emitter and the receiver is presented also. The crucial part of the research was the design and development of the algorithms responsible for the processing...
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