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 98 for “"temperature sensors"”.
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Transient response of temperature sensors
… linear recursive estimator was used to estimate temperature changes in real time by basically weighing the new estimate according to how good the previous estimate was. Temperature measurement in the presence of noise is possible by using the Kalman filter which is a very powerful and impressive …
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Smart polymeric temperature sensors – for biological systems
… damaged brain is vulnerable to increase in brain temperature after a severe head injury. Continuous monitoring of intracranial temperature depicts functionality essential to the treatment of brain injury Many innovations have been made in the biomedical industry relying on electronic implants in …
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Distributed feedback fibre laser strain and temperature sensors
… distributed feedback (DFB) fibre laser sensors for simultaneous strain and temperature measurements. These fibre Bragg grating (FBG) based sensors offer strain and temperature measurement accuracies of ±0.3 - ±15 µ.epsilon and ±0.04 - ±0.2°C which are suitable for many applications. The …
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Self-Calibrated Interferometric/Intensity Based Fiber Optic Temperature Sensors
… of providing robust and reliable fiber optic temperature sensors capable of operating in harsh environments, a novel type of fiber optic sensor system titled self-calibrated interferometric/intensity-based (SCIIB) fiber optic temperature sensor system is presented in this thesis including the …
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Fibre Bragg grating temperature sensors for high-speed machining applications
… grinding research, it is required to measure temperature within the workpiece. Present techniques are thermocouple based, and often suffer from excessive electrical noise on the signal. This thesis presents a number of novel and existing optical sensing devices that overcome this limitation …
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Design, Fabrication, and Interrogation of Integrated Wireless SAW Temperature Sensors
Wireless surface acoustic wave (SAW) sensors offer unique advantages over other sensor technologies because of their inherent ability to operate in harsh environments and completely passive operation, providing a reliable, maintenance-free life cycle. For certain SAW sensor applications the …
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Fiber-Optics Based Pressure and Temperature Sensors for Harsh Environments
Monitoring accurate temperature and pressure profiles in harsh environments is currently in high demand in aerospace gas turbine engines and nuclear reactor simulators. Having the ability to measure both quantities continuously over a region, without thermal coupling, using a sensor with a small …
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Modeling and Testing of Fast Response, Fiber-Optic Temperature Sensors
… analyze and test a fast response fiber-optic temperature probe and sensor. The sensor is intended for measuring rapid temperature changes such as produced by a blast wave formed by a detonation. This work was performed in coordination with Luna Innovations Incorporated, and the design is based …
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DISTRIBUTED FIBER-OPTIC TEMPERATURE SENSORS FOR APPLICATIONS IN THE STEEL INDUSTRY
<p>"Steelmaking facilities require continuous temperature measurements throughout the manufacturing process to ensure consistent product quality and high productivity. Motivated by the limitations of conventional temperature sensors, distributed fiber-optic sensors (DFOS) were developed and …
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Distributed fiber-optic strain and temperature sensors using photoinduced bragg gratings
… development of distributed fiber-optic strain sensors using photo induced Bragg gratings is presented. The one dimensional wave equation is solved for a slowly varying sinusoidal modulation of the index of refraction. The solution is found to take the form of a fourier transform for low …
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Heat Flux Reconstruction in a Multimaterial Gauge with Multiple Embedded Temperature Sensors
Creating heat flux maps is one of the major data reduction tasks of ground-test hypersonic facilities. The ability to embed multiple high-frequency sensing elements offers improved performance of over other types of heat flux gauges, such as Schmidt-Bolter gauges, when there is significant lateral …
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Investigation of materials for use in high-temperature, thin-film heaters and temperature sensors
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Dynamic temperature estimation of power electronics systems
This thesis proposes a method for accurate temperature estimation of thermally-aware power electronics systems. The duality between electrical systems and thermal systems was considered for thermal modeling. High dimensional thermal models present a challenge for online estimation. RC …
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Design of a Bandgap-Less Temperature Sensor for Achieving High Untrimmed Accuracy
Temperature sensors are extensively used in measurement, instrumentation and control systems. CMOS based temperature sensors offer benefits of low cost and direct digital outputs over conventional sensors. However, they are limited in their absolute accuracy due to the non-ideal behaviour of the …
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Development and Testing of a Multiplexed Temperature Sensor
… studying phenomena associated with steep surface temperature gradients, such as boiling, need to be able to obtain a detailed surface temperature distribution. Such a distribution can be obtained by taking measurements at a number of discrete locations on the surface using multiple individual …
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An organic thin-film transistor circuit for large-area temperature-sensing
… of organic thin-film transistors (OTFTs) for temperature-sensing. The goal of this work is twofold: the understanding of the OTFT's electrical characteristics' temperature dependence, and the creation of OTFT temperature-sensing circuits. We find that OTFTs have temperature-dependent …
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Fabry-Perot Sapphire Temperature Sensor for Use in Coal Gasification
Sapphire fiber based temperature sensors are exceptional in their ability to operate at temperatures above 1000C and as high as 1800C. Sapphire fiber technology is emerging and the fiber is available commercially. Sapphire fiber has a high loss, is highly multi-mode and does not have a solid …
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Novel Optical Sensors for High Temperature Measurement in Harsh Environments
Accurate measurement of temperature is essential for the safe and efficient operation and control of a vast range of industrial processes. Many of these processes involve harsh environments, such as high temperature, high pressure, chemical corrosion, toxicity, strong electromagnetic interference, …
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Low cost monitoring system to diagnose problematic rail bed : case study of Mud Pumping Site
This thesis describes the development of low cost sensors and wireless sensor network (WSN) platform aimed at characterizing problematic rail beds (subgrade). The instrumentations are installed at a busy high-speed Northeast Corridor (NEC) railway site that is experiencing recurring mud pumping …
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