A continuous incremental impedance resolving system

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1966

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Abstract

Electrical impedance is a property of living tissues and organs. It has been noted by physiologists that this impedance and its variations reflect the function of cells and organs. Some of the conditions that may cause a variation in the electrical impedance are: thyroid function, estrogenic activity, respiration, cardiac activity and blood flow. Variations in the total impedance, the resistive component and the reactive component, have all been detected at different frequencies. However, simultaneous detection of both the resistive and reactive components has not been reported in the literature. It was the purpose of the research described in this thesis to design and build the necessary electronic equipment to simultaneously detect both components without the need to make intermediate adjustments of balance controls commonly found in bridge instruments. Chapter I is a discussion of the significance of electrical impedance in living tissues and organs. The second chapter is devoted to instrumentation techniques and important considerations. Chapter III presents a technical discussion of all the electronic equipment developed to achieve the previously stated goals. The fourth chapter presents the results of tests of the system which show that the system has the capability of detecting both resistive and reactive variations of less than 1 ohm with a stability of better than 1 part in 5000 for a time interval of greater than thirty minutes.

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