Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Velocity Modulation"”.
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Velocity modulation of electromagnetic waves
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1956
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High-accuracy and high-precision infrared spectroscopy of fundamental molecular ions using noise immune cavity enhanced optical heterodyne velocity modulation spectroscopy
… can be accomplished by combining heterodyne modulation, cavity enhancement, and velocity modulation in a spectroscopic technique called Noise-Immune Cavity-Enhanced Optical Heterodyne Velocity Modulation Spectroscopy (NICE-OHVMS). This thesis will describe efforts to conduct high-resolution …
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The NICE-OHVMS technique: realizing the full potential of precision molecular ion spectroscopy
Noise Immune Cavity Enhanced Optical Heterodyne Velocity Modulation Spectroscopy (NICE-OHVMS) is one of the most sensitive spectroscopic techniques specific to molecular ions. NICE-OHVMS relies on the combination of three separate techniques, each of which is a powerful tool. Cavity enhancement …
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Novel techniques for molecular ion spectroscopy in a discharge
Velocity modulation laser spectroscopy has proven to be a successful spectroscopic technique for the study of molecular ions; indeed, it has become the conventional technique. However, there are a number of limitations to velocity modulation in its conventional form. First, there is a background …
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Physics and Simulation of High-Speed Heterostructure Devices
… dual-channel high electron mobility transistor, velocity-modulation transistor, and real-space transfer (negative resistance field-effect transistor, charge injection transistor) transistors.
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Sensitive and high-precision rovibrational spectroscopy of molecular ions relevant to astronomical and quantum chemistry
… Noise Immune Cavity Enhanced Optical Heterodyne Velocity Modulation Spectroscopy (NICE-OHVMS) combines the sensitivity of cavity-enhanced methods with the selectivity of velocity modulation. In this work, a NICE-OHVMS instrument which suffered from parasitic etalons and a sub-optimal mid-infrared …
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Large Signal HBT Model and Integrated Circuit Design Using 300-Ghz Indium Phosphide HBT Technology
… base-collector region covering current blocking, velocity modulation and self-heating. Model is verified in terms of single devices and integrated circuits. Good fitting to the measured DC and high-frequency data from single HBTs is achieved. In terms of circuit verification, high-gain and …
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New techniques for sub-Doppler spectroscopy of molecular ions
… are described in this thesis: cavity enhanced velocity modulation spectroscopy (CEVMS) and ion beam spectroscopy. Each of these techniques was first implemented in the near-infrared spectral region using a titanium sapphire laser, and was then extended into the mid-infrared, using an optical …
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Terrain aware tactical motion planning and control algorithms for off-road UGVs in GNSS denied hostile environments
… consistency over uneven landscapes. A tactical velocity modulation scheme adjusts motion dynamics based on terrain elevation and obstacle proximity, while collision avoidance is achieved through the generation of safe navigation corridors using geometric constructs. The control system ensures …
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Design, construction, and characterization of an ultra-sensitive, high-precision fast ion-beam spectrometer for the study of molecular ions
… to be recorded. While some techniques, such as velocity modulation spectroscopy, provide semi-rigorous ion/neutral discrimination, the spectrometer employed in this dissertation provides a rigorous, spatial discrimination against background neutrals. The major challenge is the intrinsic weakness …