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.
Results
Showing 1 to 5 of 5 for “"Frequency uncertainty"”.
-
Hardware architectures for compact microwave and millimeter wave cameras
… to achieve such a millimeter wave camera. First, frequency uncertainty in signals generated by a practical microwave source, which is prone to drift in output frequency, was studied to determine its effect on SAR-generated images. A direct relationship was found between the level of image …
-
Mechanically driven pendula for instructional laboratories
… with time with a constant, adjustable frequency. I designed and constructed the experiment to be easily implemented into any physics lab. I tested the apparatus and observed driven resonance for both types of pendula. All of the measured resonant frequencies I determined using the …
-
Dynamic Strain Measurement Using Brillouin Optical Time-Domain Reflectometry
… input threshold for this BOTDR system. The frequency uncertainties of the Brillouin frequency shift, with given pulse durations, fibre lengths and number of averaging, are calculated. The 60Hz sinusoidal strain vibrations on the optic fibre under test are experimentally detected with 4m …
-
Timekeeping and accelerometry with robust light pulse atom interferometers
… This thesis investigates atom optics that use frequency- and intensity-modulated laser pulses to suppress sensitivity to these inhomogeneities. For atomic timekeeping applications, a Ramsey LPAI sequence based on stimulated Raman transitions and frequency-swept adiabatic rapid passage (ARP) was …
-
Time-Frequency Localisation of Distributed Brillouin Optical Time Domain Reflectometry
… (BOTDR) takes the advantages of obtaining full frequency spectrum to provide strain and temperature information along the optic fibre. The key parameters of distributed fibre optic sensors, spatial and frequency resolution, are strongly linked with the time-frequency (T-F) localisation in the …