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Made available in DSpace on 2014-10-09T12:45:43Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:08:04Z (GMT). No. of bitstreams: 1 07501.pdf: 4082320 bytes, checksum: 50a98dfc3e7126d5b1c09ad2c2bcd7df (MD5) / Dissertacao (Mestrado Profissionalizante em Lasers em Odontologia) / IPEN/D-MPLO / Intituto de Pesquisas Energeticas e Nucleares, IPEN/CNEN-SP; Faculdade de Odontologia, Universidade de Sao Paulo

In this thesis is dealed the technical term diagnostic with Fluke Ti55 thermo imager. In the introduction of description is analyzed noncontact temperature measurement including principle, uncertainties measurement and measurement system. In other parts of the work is focused on thermal imaging, termogram, description Fluke Ti55 termo imager and measurement of mechanical stress. The concluding part of the description and processing of measurements, including their evaluation.

In this thesis is dealed the technical term diagnostic with Fluke Ti55 thermo imager. In the introduction of description is analyzed noncontact temperature measurement including principle, uncertainties measurement and measurement system. In other parts of the work is focused on thermal imaging, termogram, description Fluke Ti55 termo imager and measurement of mechanical stress. The concluding part of the description and processing of measurements, including their evaluation.

The temperature belongs to the one of the basic values for a commercial measuring processes. The exact measuring of the temperature is the essential for a multitude manufacturing procedures and their regulations. This study is mainly focused to determine what influences can take the negative effect to exact temperature measurement. Content: List of of possible mistakes and their compensation wit the special focus on a notorious and frequent dynamic errors. Characteristic of those dynamic properties are important to analyze all the possibilities to correct different measuring systems. In this study we also present the simple model to deal with some error corrections

Detailed introducition of non-contact temperature measurement and correct settings of the measurement device, which has great influence on correct temperature determination, is the aim of this diploma thesis. The experimental laboratory was established to verify dependencies by Compaq CM non-contact thermometer. Conclusions and recomendations are deduced from the measurement results and their analysis.

A method of performing local transient heat flux measurements in an uncooled axisymmetric hybrid rocket nozzle is presented. Surface temperatures are collected at various axial locations during short duration tests and post processed using finite difference techniques to determine local transient heat fluxes and film coefficients. Comparisons are made between the collected data and the complete Bartz model. Although strong agreement is observed in certain sections of the nozzle, ideal steady state conditions are not observed to entirely validate the Bartz model for hybrid rocket nozzles. An experimental error analysis indicates the experimental heat fluxes are accurate within ±5.2% and supports the accuracy of the results.

The goal of this research was to design and test an experimental setup capable of performing a TIG welding process and acquiring temperature measurements near the weld with the use of an infrared spot sensor. The data collected can then be used to validate a computer simulation that models the exact same process. An experimental setup was built, and preliminary temperature data were collected. It was determined that infrared measurements taken at the arc contain excessive amounts of interfering radiation emanating from the welding zone. The optimal angle of orientation is normal to the weld line. In this way an infrared spot sensor can be focused on an area just down weld of the arc where the temperatures remain relatively high and thermal gradients, although still large, are at a minimum. Additional data were collected from thermocouples to validate the infrared sensor results and also to provide additional data that can be compared to a computer model. Sources of error were identified and recommendations were made as to how they can be avoided or minimized. / Master of Science

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