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Thesis (M.S.)--University of North Texas, May, 2007. / Title from title page display. Includes bibliographical references.

Thesis (Ph. D.)--Oregon State University, 2004. / Typescript (photocopy). Includes bibliographical references (leaves 100-103).

Thesis (M.S.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaf 114). Also available on the World Wide Web.

M.Ing. (Electrical & Electronic Engineering) / Please refer to full text to view abstract

This thesis describes the design and development of a sampling-type function generator and a four-quadrant analog multiplier. The project is divided into two parts, the general arrangement and circuitry of the function generator and multiplier, and the timing circuits which actuate them. This thesis is concerned with the general circuitry. The functions to be generated are photographed on 35 mm. film and mounted in standard frames which are then fastened to the rim of a rotating disk. An optical system is used to scan the functions in a time-sequential manner. A timing system selects the required abscissa and actuates a combination of electronic gates and clamping circuits which stores the voltage, Eք, representing the ordinate, and the voltage, Eм, representing the maximum of the function. These two stored voltages, Eք and Eм, are applied to separate sweep circuits which produce sweep outputs of EքN(t) and EмN(t) respectively. A system of comparator circuits and gates samples the EքN(t) at the instant a reference voltage, E, equals the sweep EмN(t). Since the sweeps, N(t) are identical, the value of EքN(t) at the instant of sampling is (formula not included). This sequence of operations occurs for each function as it is scanned. Each successive multiplication is stored in its own storage unit. All the circuits are designed to be self-calibrating to minimize error due to drift. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

Fiber optic temperature sensors are excellent candidates for monitoring the temperature along the stator windings of a large electric power generator. Unlike thermocouple thermometers, they are immune to the effects of strong magnetic fields which are present in all power generators. Several different point and line sensors have been evaluated in their ability to resolve temperature and temperature distribution (respectively), as well as their compatibility with the generator environment. The sensor must function inside the generator for long periods of time (up to 25 years) without benefit of recalibration. This constraint has required us to devise methods by which the sensor may remain permanently calibrated. In almost all cases, it is necessary to measure a natural characteristic of a device which is temperature sensitive in order to achieve permanent calibration. This will enable the device to function despite the varying characteristics of the source and detector equipment.

Master of Science