Papers by Keyword: Temperature Sensors

Abstract: In this paper we report on the performance of 4H-SiC bipolar diodes as temperature sensors far beyond 273K. The sensor is measured from 150K to 445K covering a temperature range of 295K. In this operating temperature range, the sensor characteristic V_D-T is highly linear and it is dominated by the typical dependence of the p-i-n diode voltage on the temperature. The sensor sensitivity is -4.48mV/K for a diode current of 2nA with a maximum error of 4.3K across the full temperature range. Although 4H-SiC p-i-n are mainly focused on very high temperature applications, our analysis on the performance of bipolar diodes at low temperatures highlights its feasibility as temperature sensor for aerospace and high altitude applications where cryogenic temperatures are achieved.

Abstract: The property of some materials to change their color in response to temperature changes is called thermochromism. A polymer fiber manufactured in such way that a thermochromic pigment is embedded in the polymeric matrix material develops accordingly thermochromic functionality and can be used as a temperature change indicator. The characterization of a polymer thermochromic fiber with respect to its color change in response to temperature change is presented in this paper. A specially developed characterization apparatus was developed for this purpose. The temperature span of the involved experiment was from 23.5°C (room temperature) to 60°C, while the tested fiber was found to be responsive regarding its chromatic variance mainly within the temperature range 30.5oC - 50oC. During the involved digital image processing, the chromatic shift of the sample was characterized according to the HSV (hue-saturation-value) color model. Fiber’s original color was found to change with temperature by presenting a monotonic reduction of saturation and value with temperature increase.

Abstract: Vehicle theft and vandalism is unfortunately an extremely common problem. As our world is modernizing, the ways of thefts are also changing and are becoming more and more sophisticated. Our project features an anti-theft system for wheels and rims. Moreover, the overheating and further bursting of the wheels has also been a major issue which has been worked over in this project.

Abstract: An efficient methodology of electro-thermal design of smart power semiconductor devices and ICs, based on the combined use of SPICE circuit analysis tool and software tools for 2D/3D thermal simulation of IC chip construction, is presented. The features of low, medium and high power elements, temperature sensors, IC chips simulation are considered.

Abstract: In order to improve measuring-temperature accuracy of the PT100 temperature sensor, we conduct multi-point calibration experiment. The BP neural network based on LM algorithm can process experimental data and the least square method can fit out more accurate formula that express the relationship between the temperature and resistance. It is available that this arithmetic that the interrelated experiment demonstrate its accuracy improve precision of the PT100 temperature sensor.This arithmetic can be applied to the calibration test.

Abstract: The semiconductor material, SiC single crystal substrate, has been become an indispensable substrate material in the field of semiconductor lighting. In order to detect the influence of polishing interface temperature on polishing quality in chemical mechanical polishing (CMP) SiC single crystal substrate online, in this paper, according to the principle of chemical mechanical polishing, a device has been designed for detecting the polishing interface temperature in chemical mechanical polishing. AT89S52 microcontroller-based, using six 1-wire digital temperature thermometer DS18B20 to detect the temperature signal of different six locations, then to transmit out by the wireless transmission module nRF24L01 chip, and to achieve a multi-point temperature signal collection and wireless transmission. The device is simple, reliable and low cost. It will be providing a reference for temperature measurements in ultra-precision machining process online.

Abstract: In the present work we have carried out production and characterization of a new complex cubic perovskite ceramic Ca₂MgWO₆ to evaluate its application viability as inert material for petroleum industry. Ca₂MgWO₆ was produced by thermo-mechanical processing and calcinations at 1.200°C, using stoichiometric amounts of constituent chemicals CaCO₃, MgO and WO₃. The calcined material was examined by x-ray diffraction, which identified the phase formation Ca₂MgWO₆. Calcined material was powdered in a ball mill, compacted as circular discs and subjected to sintering at temperatures of 1.250, 1.300 and 1.350°C. The powders, both those employed in the calcined pellets as those produced by the mill, were characterized by size distribution. The sintered discs were characterized by SEM. The results showed that the ceramics sintered at 1.250°C presented better results in terms of microstructural features and mechanical properties for their possible application as inert material for petroleum industry.

Abstract: Precise local temperature measurement is important for research on failure analysis of integrated circuits, micro/nano-fluidics, chemistry reactions in confined geometry, biological and biochemical reactions, etc. Thermocouple arrays are believed powerful for local temperature sensing at the microscale with high spatial, temporal, and temperature resolutions. And, as a passive device, a thermocouple array can often be embedded in a complicated solid device, providing real-time temperature information of critical regions of the device. In this work, we will discuss in detail some key issues of temperature sensing at the microscale by using thermocouple arrays, in terms of material, fabrication, calibration, measurement, time-resolvable mapping, and potential application.

Abstract: This paper presents the method of designing a mechatronic system, as a result of an integration. As an example of the integration automation components, in one coherent measuring system, a measurement path for temperature sensors is proposed. A measuring path can be defined as a scale model, which reproduces thermal states of a temperature sensors system, used in real industrial applications. The system is extended by database application based on Access. Taking advantage of an iFIX special database block the temporary values of temperature are recorded in Access database with permanent period of time. The final analysis is performed in an Excel sheet.