Masters Theses

Date of Award

12-2007

Degree Type

Thesis

Degree Name

Master of Science

Major

Electrical Engineering

Major Professor

Jie Wu

Committee Members

Jay Frankel, Don W. Bouldin

Abstract

Measurement of heat flux is required in many aerospace and heat treatment applications. Temperature data collected at embedded sites are noisy especially when measurements are taken in hostile environments. The predicted heat flux, when based on the rate of change of temperature, is more accurate than using temperature data as the latter data form is ill-posed. In the context of heat flux prediction, calculating the rate of change of temperature involves differentiation, which is the primary source of ill-posed effects.

This work involves developing a universal voltage rate sensor interface that minimizes these effects and also improves the signal-to-noise ratio. This is based on the concept of amplitude modulating the temperature data and differentiating it at a higher frequency. The proposed concept of improvement in signal-to-noise ratio was verified by the Matlab and PSpice simulations. The experimental outputs matched the simulations results.

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