Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 95 for “"measurement accuracy"”.
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Comparison of Three Dimensional Measurement Accuracy Using Stereo Vision
… to the cameras (about 912mm), three dimensional measurement has relatively small error. The error increases when the distance becomes larger. Experiments also verify that the larger the distance between the cameras (within the tested range), the better the measuring results, except for the …
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Influence of Altitude and Scan Angle on UAS-LiDAR Ground Height Measurement Accuracy in Juncus roemerianus Scheele (Black Needle Rush)-dominated Marshes
… methods on ground height estimations. To assess accuracy of LiDAR, UAS LiDAR and survey-grade topographic field measurements were collected at two coastal marshes as well as a local control site. At marsh sites, average RMSE values were approximately 52 cm for altitudes less than 75 m, and 14 cm …
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Improvements in fluidic device evaluation using particle image velocimetry
This work investigates flow measurement capabilities within meso- and micro-scaled medically relevant devices using particle image velocimetry (PIV). Medical devices can be particularly challenging to validate due to small length scales and complex geometries, which can reduce measurement accuracy …
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Microthruster Experimental Analysis
… Calibration experiments confirmed the force measurement accuracy of the setup while gas thrust experiments were used to help determine the most efficient divergence half angle. Thrust results were compared to findings from two separate scientific studies that sought to optimize microthruster …
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Determination of Stability Conditions of a Pyrometer in a Continous Production
Accurate temperature measurement is essential in battery production, especially during the preheating phase before foaming. This thesis explores the stability of pyrometers, non-contact infrared sensors, used in continuous production at BMW Group Debrecen. Inaccurate readings can lead to faulty …
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Developing a flexible range sensing system for industrial inspection applications
… a theory exploring the limitations of the measurement accuracy of the range detection algorithm employed in the prototype system. The maximum data generation rate of the prototype system is 380 range/intensity lines per second at 128 range/intensity pixels per line. Several proposals toward …
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High Accuracy Real-time GPS Synchronized Frequency Measurement Device for Wide-area Power Grid Monitoring
… The FDR works as a sensor, which performs local measurements and transmits calculations of frequency, voltage magnitude and voltage angle to the remote servers via the Internet. Compared with its commercial counterpart Phasor Measurement Unit (PMU), FDR provides less expensive version for …
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Application of Precision Successive-approximation-register Analog-to-digital Converters for Digital Root-mean-square Calculation
… a digital approach to root-mean-square (RMS) measurement is proposed. The work begins with an explicit accumulation and averaging approach, and a set of improvements were designed to increase measurement accuracy and reliability. Algorithms are compared using the metrics of error, power …
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On-the-fly assembled multistage adaptive testing
… are not efficient and do not have sufficient measurement accuracy for these examinees. To address this limitation, new item selection strategies are proposed in Chapter 3 to allow items to be selected from wider ability intervals at early stages and selection intervals get narrower as examinee …
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Online Electromagnetic Wave Monitoring System for Petroleum Industry Applications
… in complexity in the oil industry, is the measurement of multiphase flow components, the mixing ratio of oil, water, and gas flowing in a pipeline. Electromagnetic (EM) Wave sensors can provide an attractive solution, because microwave signals can penetrate most materials allowing the …
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Development of Software to Measure the Gravitational Redshift with RadioAstron
… is anticipated to be determined with a relative accuracy of 10^-5. A third-order dynamical model has been implemented to predict frequency shifts in the spacecraft's carrier signal needed to conduct the experiment. The theory behind this model is developed, the software implementation described …
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Digital Human Model for Postural Assessment - Postural Visualisation Application
… augmented reality technology to improve how measurements are taken, implemented as part of a complete system that standardises the data recording and transfer process to improve the efficiency of those processes and enables data to be more easily understood by other people.<br/><br/>An …
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Detection of Fast Moving Pulses in a Noisy Environment
… a combination of techniques to improve timing measurement accuracy of systems processing Gaussian pulses distorted by noise. The approach involves M/N detection, integration, and either correlation or threshold timing measurement techniques. The gain of this process is an increase of the …
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Development of the BASS rake acoustic current sensor : measuring velocity in the continental shelf wave bottom boundary layer
… layer. The mechanical design supports multiple measurement levels with millimeter vertical spacing. The mechanical design is integrated with an electronic interface designed to permit flexible acquisition of a suite of horizontal and vertical velocity measurements without sacrificing the …
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Visual Feedback Stabilisation of a Cart Inverted Pendulum A
… of processing time, amplitude of oscillation, measurement accuracy and resting oscillation. For each key performance indicator, our system was found to be superior in many cases to that found in the literature. The thesis also delivers a complete test software environment, where vision-based …
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Design and implementation of a high precision profilometer
… through various tests, including: 1) measurement / positioning repeatibility tests of individual components, 2) measurement accuracy tests (documented in a separate report), and 3) other tests, such as determination of measurement sensitivity, drift rates, and system natural frequency.
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Using Vibration Analysis to Determine Refrigerant Levels In an Automotive Air Conditioning System
… acceleration at one point on the structure. The measurements focused on finding the natural frequency at the accumulator bottle of the air condition system with running and non-running compressor scenarios. The experimental frequency response function (FRF) results indicate distinct trends in the …
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An investigation of risk homeostasis in a laboratory environment
… the number of errors committed, and subtask measurement accuracy were tabulated. Between-subject analyses did not reveal risk compensation behavior. Moreover, within-subject comparisons failed to show a significant risk compensation effect or the presence of a homeostatic regulating mechanism …
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Measurement of Liquid Film in Annular Flow Using X-Ray Densitometry
… in nuclear thermal hydraulics, yet conventional measurement techniques such as impedance probes may compromise accuracy by directly contacting and potentially disturbing the flow. Non-intrusive measurement methods are needed to provide more reliable film thickness data for improved reactor safety …
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Quasi-Distributed Intrinsic Fabry-Perot Interferometric Fiber Sensor for Temperature and Strain Sensing
… fiber sensor suitable for temperature and strain measurement. For the first time to our knowledge, an IFPI sensor using a different type of fiber spliced in between two single-mode fibers is proposed and tested. The proposed sensor has high measurement accuracy, excellent repeatability, a large …
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