M.Sc.

Abstract : Wide range temperature monitoring and annunciation systems are implemented in many industrial applications and the present work is intended to develop a modern and easy-to-install temperature monitoring system that serves monitoring and annunciation of several nodes. The proposed system uses type-k thermocouples as primary sensing element; the output voltage from the thermocouple is amplified using suitable thermocouple amplifier circuits. The system is intended to measure temperatures in the range from 0 to 1250 °C at two different measuring points.

Abstract : In recent years modulation techniques techniques have been introduced into power semiconductor switching devices have proved to be suitable elements for achieving the required modulation processes. Due to the development of these devices, modulation find widespread application in the power frequency conversion and power control. In the present work an attempt is made to use a frequency modulation of discrete form as a technique to development a frequency changer which may compete with the conventional power frequency changer.

Abstract : One of the most useful microwave ferrite components is the isolator, which is a two-port device having unidirectional transmission characteristics. A common application uses an isolator between a high-power source and a load to prevent possible reflections from damaging the source. The most popular type of microwave isolator is the resonance isolator. A single tone resonance isolator with resonance frequency of 10 GHz, and a broad band resonance isolator have been designed and optimized.