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 53 for “"impedance measurement"”.
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Impedance measurement platform for impedimetric biosensor
… Using electrical read out methods several measurements can be multiplexed and a differential measurements made. With a differential measurement the precision of the system is improved by cancelling out common mode bio-chemical noise. The multiplexed measurement enables measurement of …
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Monitoring of Biodiesel Transesterification Process Using Impedance Measurement
… process monitoring using low frequency (15kHz) impedance sensing which is able to provide information regarding the progress of mass transfer and chemical reaction during biodiesel production. An interdigitated (ID) sensor has been used to monitoring the biodiesel process The ID sensor is of …
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Development of a bio-impedance measurement system for bladder monitoring
… this purpose, the development of a low cost bio-impedance measurement system as a method for bladder monitoring is investigated in this thesis. Prior to this thesis, the trend in the literature was to identify the correlation between the change of the impedance and the accumulation of urine in …
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Impedance Measurement of Cells; Experiment and Analysis of Passivation Layer
… the resistance to the flow of current, i.e. impedance, could be used to characterize the cell itself. In this aspect, the impedance of cells can be a promising tool to investigate the state of the cell. A simple way of measuring the impedance would be a planar-microelectrode method. The cells …
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AC/DC power system small-signal impedance measurement for stability analysis
… if the Nyquist contour of product of the source impedance and load admittance satisfied the Nyquist stability criterion. Methods of extracting impedance in dc systems have been well established. However, for ac systems, the traditional current-injection techniques are not suitable, especially for …
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MEMS Coulter counter for dynamic impedance measurement of time sensitive cells
… which can detect and monitor the dynamic cell impedance changes in situ as a function of time and cellular volumetric changes after mixing isolated cell populations with different extracellular media within 0.2 second from the start of mixing. The novelty of this design is the use of …
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Power Electronics- based Photovoltaics Panel Fault Detection using Online Impedance Measurement Technique
… forward bias to reverse bias state. PV panel AC impedance can be used as an early-stage fault indicator. Also, comparing AC impedance magnitude and phase at maximum power point (MPP) or near MPP can help identify the nature of the fault in a PV system. The focus of the thesis is proposing the …
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Switching mode power supply noise source impedance measurement and EMI filter characterization
… of an EMI filter is closely related to the impedance of the noise source. Due to the time-varying nature of the noise source impedance of an offline power supply, the measurement of it cannot be done using conventional impedance measuring methods. Two new methods, the insertion loss method …
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Two-dimensional Mapping of Interface Thermal Resistance by Transient Thermal Impedance Measurement
… to have a simple, reliable, and nondestructive measurement technique that would produce a 2-d map of the interface thermal resistance across a large bonded area. Based on the transient thermal method of JEDEC standard 51-14, we developed a measurement technique that involves moving a thermal …
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Development of Implantable Optical Fibers for Immunotherapeutics Delivery and Tumor Impedance Measurement
… optical fibers with both local delivery and measurement capabilities over the course of a few weeks. The combination of local immune checkpoint blockade antibodies delivery via this device with photodynamic therapy elicits a sustained anti-tumor immunity in multiple tumor models. Named …
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Design of a micro-interdigitated electrode for impedance measurement performance in a biochemical assay
The performance of interdigitated electrodes for impedance measurements is dependent upon the geometric design of the electrode pattern and can be significantly impacted by manufactured variability or defects. For processes which rely on precise electrode performance, such as the biochemical assay …
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A Framework for an Implantable Wireless Pressure and Volume Sensor Focusing on the Diagnosis and Treatment of Shunt Failure in Hydrocephalus Patients
… negating the need for an implanted power source. Impedance measurement estimation techniques were suggested, studied and applied to the compliance sensing system. A new impedance measurement technique, accounting for multiple variability in the domain, was developed. An extensive simulation …
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Communication and Control in Power Electronics Systems
… Zoomed in further, novel, state-of-the-art measurement equipment could have been built from different power electronics devices, and communication among them would be necessary for good operation. Zoomed further in, communication among different pieces of power electronics devices (such as …
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An Algorithm and System for Measuring Impedance in D-Q Coordinates
… University. Chapter 1 introduces the concept of impedance measurement, and discusses previous work on this topic. This chapter also addresses issues associated with impedance measurement. Chapter 2 introduces the analyzer architecture and the proposed algorithm. The algorithm involves locking on …
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A reconfigurable electrode array for use in rotational electrical impedance myography
… design of a novel handheld electrode probe and measurement system for use in rotational electrical impedance myography (EIM), which is a method for diagnosing neuromuscular disease. The probe can be controlled from a PC via USB and uses an array of small electrode cells that can be connected …
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High-Resolution Thermal Measurements in Fluids
… thin-film sensor is presented allowing flow-rate measurements of down to 1 milligramm per hour, as required for application in medical dosing systems. <br>Due to the fast response of the sensor to thermal actuation and its low power requirements with the subsequent low thermal influence of the …
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Degradation in lead zirconate titanate thin film capacitors for non-volatile memory applications
… of the number of fatigue cycles is presented. Impedance and modulus spectroscopic techniques have been applied to study the effect of degradation on the ferroelectric thin film. It has been shown that with accurate low frequency impedance measurement equipment, new insight can be gained on the …
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Online Measurement of Three-phase AC Power System Impedance in Synchronous Coordinates
… performance. But their negative incremental impedance nature increases the possibility of system instability. A small-signal analysis that uses interface impedances defined in the synchronous frame is developed by Belkhayat at Purdue in the mid-90s to access the system stability. The system …
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A Synchronous Distributed Control and Communication Network for High-Frequency SiC-Based Modular Power Converters
… is proposed and verified for a 120 kHz SiC-based impedance measurement unit (IMU) with cascaded H-bridge PEBBs. An improved synchronization method with additional analog circuits is further implemented and verified with sub-ns synchronization accuracy.
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SMALL SIGNAL STABILITY ANALYSIS OF THREE-PHASE MICROGRID SYSTEM IN THE PRESENCE OF CONSTANT POWER LOADS
… and cause instability issues in the system. An impedance-based method is preferable for the stability analysis of such systems in real-time. Perturbation methods can be used to determine system impedance. The perturbation approach involves injecting various perturbation signals into the system …
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