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Far Infrared Fourier Transform Spectroscopy Using Ring Interferometer, Changqing Qiu
Far Infrared Fourier Transform Spectroscopy Using Ring Interferometer, Changqing Qiu
Theses
A circular mirror interferometer named ring interferometer, which was designed by Dr. K.D. Moller, was built and set up for far-infrared Fourier transform spectroscopy. The ring interferometer has ten circular mirrors with the same area. By applying Fraunhofer diffraction theory, the calculation shows that the ring interferometer will have large diffraction angle range compared with lamellar grating interferometer which has rectangular mirrors with same width. Therefore the ring interferometer will be more efficient than lamellar grating in far-infrared spectroscopy. The experimental results show that this ring interferometer will work as expected.
In addition, a "home made" helium cooled detector was …
Non-Contact Measurement For Thermal Conductivity Of Diamond-Like And Hard Carbon Thin Films, Ganming Qin
Non-Contact Measurement For Thermal Conductivity Of Diamond-Like And Hard Carbon Thin Films, Ganming Qin
Theses
In this research work, non-contact temperature measurement was applied to determine the thermal conductivity of diamond-like and hard carbon thin films. Dielectric materials widely used as thin films in device manufacturing are SiO2, Si3N4, polymer, and etc. However, their heat dissipating capacity is not good for power devices. It is necessary to develop a new material for this purpose. Diamond crystal is a high quality dielectric material. It has the highest room-temperature thermal conductivity [k=20W (cm · K) at 20°C] among all materials. In addition, it has high electrical resistivity ( >1016 Ω …