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We deal with the numerical model of overheating of primary and secondary coils of voltage instrument transformer. Calculated values are compared with two different measuring methods — measuring with thermal sensors and calculation of heating from measured resistance. All calculations are solved in three operating conditions by rated voltage, thermal limiting output and rated voltage factor 1.9 Un...
In this work we explore the interplay of ferromagnetism and superconductivity of single-crystalline Ni nanowires measured with superconducting Nb leads.
This paper presents a low-cost pH, temperature and ion concentration sensors utilizing laser direct writing the industrial grade touch panel film (TPF). The commercial touch panel film is composed of PET substrate with Ta2O5 and ITO (indium-tin-oxide) coating layers. The conductive ITO layer exhibits excellent properties for adsorbing hydrogen ions and good temperature coefficient of resistance which...
In this work, a simple and cost effective MEMS based gas sensor incorporating with WO3 nanoparticle is presented of the measurement nitric oxide on ppb level. The WO3 NPs synthesis, it was deposited on Pt/Ni/SiNx/SiO2/Silicon substrate by HWCVD with thermal furnace annealing process. The sample characterized was using SEM, XRD, EDS; The electrical measurements for transient resistance by keithley...
Analog front-end for precise temperature measurement of a human body has been presented. The discussed analog front-end (AFE) contains a new temperature calibration technique based on on-chip resistor. The described calibration method allows to obtain very high accuracy, even 0.1 °C, in very wide range of an operating temperature of an integrated circuit. The AFE consists of a bandgap current reference,...
Transient thermal analysis (TTA) is widely used to measure the transient thermal impedance (Zth) and the thermal resistance of LEDs because reliability and lifetime of LED depends critically on junction temperature. To predict up-front in the product development process the lifetime of LED modules, calibrated finite element (FE) models are used. In this paper a FE-model for a family of high power...
This paper covers the design and development of a custom portable equipment, which monitors gas concentrations from new types of microsensors, stores all the data and makes it available in digital format. Using sensors with information technology will lead to improving quality and safety of the climate.
Experiments have been performed to characterize the thermal resistance of thermal interface materials that deform under mechanical loading. TIMs in this category include elastomeric silicon rubber based TIM gap pads and pourable paste-like composite materials that set when cured. This paper reports on extensive experiments performed to characterize the overall thermal resistance of TIM pads composed...
In-situ junction-to-case thermal resistance (Theta JC) measurements are sensitive to a number of test condition factors. In this paper, the effect of electronic package die temperature on junction-to-case thermal measurements is reported over a nominal use condition temperature range of 40 to 105°C. Multiple parts were tested under a variety of boundary conditions to assess the impact of die temperature,...
The paper presents the methods for improving the accuracy of impedance measurements to the root system of plants and the ambient temperature. The proposed methods are based on the digital data processing using the maximum likelihood approach, which helps reduce the cost of the measurement devices. A comparison of the achieved measurements accuracy was carried out using the simulation technique.
A method for determining the thermal resistance of high power LEDs is described. Unlike more complicated systems, this method simply uses a fast pulse to determine the junction temperature under actual operating currents, combined with a conventional thermocouple to measure the mounting face temperature. The literature can be somewhat confusing in describing the thermal resistance of an LED. Often...
In order to develop power electronic systems with high power densities the performance of the cooling system has to be increased. Thereby, the thermal resistance of power semiconductor modules is an important design aspect. However, the thermal resistance of modules is influenced by cross-coupling effects which are dependent on the module layout and the heatsink. These cross-coupling effects are not...
In the chemical industry, the mixer or agitator is widely used. To mix the liquid of high viscosity and promote the chemical reaction, heating up the liquid till the proper temperature for the reaction is popular method. Usually the heater is set at outside of the outer vessel. Then getting homogeneous temperature inside the liquid takes long time. The longer the inhomogeneous time is, the larger...
Life prediction of insulated gate transistor is often based on the damage of unilateral factors such as solder layer or bonding wire, and there is little mention of the relationship between the damage and the increase of thermal resistance. In this paper, firstly the damage of the modules in different working conditions is quantified and compared based on the fuzzy theory, and the relationship between...
The most recent GreenTeam race car, the E0711-7, has been designed and built to set a new level of high performance race cars made by GreenTeam. This paper investigates the E0711-7's high performance powertrain design process, powertrain structure and the unique oil-cooled battery pack. Experimental results from test bench measurements and race data have been reported to illustrate the powertrain...
The paper analyses heat transfer principle of thermal gas flow meter, and presents a method of the flow measurement based on single platinum resistance. The sensor works in CTD (Constant Temperature Difference) controlling mode. The measurement circuit and the signal acquisition circuit are designed to control the platinum resistance at two different temperatures. The gas mass flow is obtained from...
Measuring and computing complex (MCC) “Luch-M” is used to perform measurements when bench testing of products. The MCC collects multi-channel data, processes them, documents and stores the measured results. “Luch-M” has been developed and implemented at JSC FR&PC “ALTAI”. The most important task of measurement assurance is testing for pattern approval.
III-nitride semiconductors are well-suited for solid-state lightening, such as light-emitting diodes (LEDs) and laser diodes (LDs). GaN (3.4 eV) alloyed with InN (0.7 eV) and AlN (6.1 eV) can cover a continuous range of a direct band-gap energy. A wide spectrum range from red to deep ultra-violet has been achieved using III-nitride LEDs12. Advanced optoelectronic devices demand higher power output...
A microgrid (MG) is potentially vulnerable to electricity theft when it operates in three different modes. In this paper a wireless sensor network (WSN), comprised of purpose built resistive temperature sensor (RTS) nodes, is used in an MG distribution network to measure the line resistance, in order to identify illegitimate user(s) in real time. The changing resistance of a copper wire with the changing...
A high accuracy sensor module for hydroponic culture system was developed. The module measures water level, temperature, and nutrient concentration values by using a single device equipped with a low-cost ribbon cable and electrodes. The module has two oscillators and the water level and the concentration value are converted into frequencies of the oscillator signals. After the conversion mechanism...
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