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 20 of 250 for “"Continuous wave"”.
-
Ultrasonic Continuous Wave Spirometer
… difference and sum of the transit times for two continuous sound waves travelling in opposite directions along the air path. The information about the transit times is contained in the phase differencces of the two sound waves across the path. A phase-locked loop is used to keep the differences …
-
Frequency-modulated continuous-wave radar processing fundamentals
… position of targets using a frequency-modulated continuous-wave (FMCW) radar. FMCW radars have applications such as collision detection and assisted cruise control in modern vehicles, due to their ability to be manufactured as low-power, single-chip systems. We will discuss the use of a …
-
A continuous-wave second harmonic gyrotron oscillator at 460 GHz
… control, the gyrotron has stably operated continuously for over an hour near 460 GHz. Diagnostic radiation pattern measurements of the beam using an array of pyroelectric sensors show a bi-Gaussian beam with 4% ellipticity. Operation in the fundamental modes, including the TE₀ ₃ ₁ mode at …
-
Frequency Modulated Continuous Wave Radar Based Fall Risk Monitoring System
… assessing fall risk using a frequency-modulated continuous-wave (FMCW) radar system, addressing the need for frequent, low-cost, longterm balance monitoring solutions. This technology is compared with ground-truth contactbased lab sensors like force plates and motion capture systems, establishing …
-
Path Following using Frequency Modulated Continuous Wave millimetre-wave Automotive Radar
… developed to only use Frequency Modulated Continuous Wave (FMCW) radar. Radar has shown to be semi-invariant to inclement weather such as snow, fog, extremely lighting conditions, and heavy rain. Traditionally, autonomous vehicle (AV) path planning algorithms use multiple introceptive and …
-
Laboratory investigation of low-density plasmas by continuous-wave laser scattering.
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
-
Continuous-wave cavity ring down spectroscopy sensor for Hall thruster erosion measurement
… for Hall thrusters. The present research applies continuous wave cavity ring down Spectroscopy (CW-CRDS) as a diagnostic tools to study the sputter erosion process for Hall thrusters. Two CW-CRDS erosion sensors have been developed for in situ monitoring of sputtered manganese (Mn) and BN. As a …
-
Tunable, continuous-wave semiconductor disk lasers with emission in the deep ultraviolet
… emission at 225nm have been achieved in continuous-wave operation. The output wavelength is tunable for 350 cm−1. This is the shortest wavelength emitted from an SDL to date and is the first implementation of intracavity frequency tripling in a visible SDL.
-
RF hardware design of a stepped frequency continuous wave ground penetrating radar
Research into stepped frequency continuous wave ground penetrating radar (SFCW GPR) at UCT has been carried out since 1990. A first generation system comprising of Hewlett-Packard test equipment controlled by a PC was assembled. Cavity-backed log spiral antennas were designed and built by the …
-
Radio-frequency components for a ten-centimeter continuous-wave automatic-tracking system
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering, 1942.
-
The Development of an Independent Frequency Modulated Continuous Wave Radar for Perimeter Security
The accessibility of Frequency Modulated Continuous Wave (FMCW) radars has provided several diverse industries with a microwave sensor that can be utilized reliably for many different applications. The research specified in this thesis focuses primarily on the perimeter security industry with the …
-
Radar-based in-cabin sensing using 60 GHz stepped-frequency continuous-wave radar
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01
-
Forward scattering of a pulsed continuous wave signal through laminar and turbulent thermal plumes
The results of an experiment examining the forward propagation or an acoustic signal through a buoyant plume are discussed. Two distinct testing sights were used. One made use of a small fresh water tank in NUWC to provide a controlled plume. The other used a larger salt water tank at WHOI to …
-
An experimental design for a statistical comparison between pulsed and continuous wave radar systems
Digitized by Kansas Correctional Industries
-
An experimental design for a statistical comparison between pulsed and continuous wave radar systems
Digitized by Kansas Correctional Industries
-
Design method for ultimate efficiency in linear-cavity continuous-wave lasers using distributed-feedback
… method for the design of linear-cavity continuous-wave laser cavitiesthat guarantees the ultimate efficiency is developed, theoretically studied and experimentally verified. Opposed to the earlier methods, which optimise the parameters of a priori defined cavity, the developed method …
-
A Frequency-Modulated Continuous Wave-Based Boundary Detection System in a Small PCB Profile
… presented in the paper, “A Frequency-Modulated Continuous Wave-Based Boundary Detection System for Determination of Monitoring Region for an Indoor Ultra-Wideband Short Range Radar-Based Eldercare Monitoring System” has determined that a frequency modulated continuous wave (FMCW) based system is …
-
Continuous wave mode locking for the determination of the acoustic nonlinearity parameter B/A
… can be found in numerous fields including shockwaves, bio-chemistry and medicine. Recent studies in the field of biomedical ultrasound have necessitated a simple and accurate means of measuring B/A in vitro.
-
An investigation into the design of an image reconstruction algorithm for continuous wave tomosynthesis
Continuous wave (CW) tomosynthesis provides many theoretical advantages over traditional breast imaging techniques, like mammography. These theoretical advantages include improved spatial resolution, better information weighting, and the ability to resolve structures hidden by tissue overlap. …
Page 1 of 13