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Articles 31 - 33 of 33
Full-Text Articles in Electromagnetics and Photonics
Derivative Absorption Spectroscopy With Tunable Laser Diodes, Andrew D. Jackson
Derivative Absorption Spectroscopy With Tunable Laser Diodes, Andrew D. Jackson
Electrical & Computer Engineering Theses & Dissertations
Derivative Absorption Spectroscopy using tunable diode lasers provides a non intrusive, sensitive, and convenient method for monitoring gaseous characteristics such as concentration, temperature, and flow velocity. In addition, the specie type can be identified, and if the equation of state is known, pressure may be deduced.
This technique was used on molecular oxygen, in which the rovibronic transitions of the A-band ( b 1 ∑g + ← X 3 ∑g - ; vII = O, vI = O) were probed. Phase sensitive detection with a lock-in amplifier provides the flexibility to examine lineshape derivatives; several such derivative …
Cathodoluminescence Of Gaas, Tyler Smith
Cathodoluminescence Of Gaas, Tyler Smith
Electrical & Computer Engineering Theses & Dissertations
Cathodoluminescence of band-gap radiation across the bulk of a proposed semiconductor switch has been studied. Such a device relies on the efficient use of cathodoluminescence to modulate the conductivity of the switch. Diagnostics were configured to measure the intensity of band-gap radiation across the bulk of several switch samples. The measured results were compared to calculations based on a four energy level band-gap model which included two deep levels EL2 and HL10.
The Influence Of Transverse Magnetic Fields On The Current-Voltage Characteristics Of Glow Discharges, Thomas J. Powers
The Influence Of Transverse Magnetic Fields On The Current-Voltage Characteristics Of Glow Discharges, Thomas J. Powers
Electrical & Computer Engineering Theses & Dissertations
In low pressure discharges, operated in electronegative gas mixtures to the right of the Paschen curve minimum, the discharge resistance can be increased by application of transverse magnetic fields. In this range of operation, both the mean free path and the larmor radius are small compared to the discharge dimensions. The relationship between the electric field and the magnetic field is therefore controlled by electron- molecule collisional processes. Specifically, the magnetically induced increase in the discharge resistance is caused by a downward shift of the electron energy distribution which leads to an increase in attachment and a reduction in ionization. …