Title of Dissertation: ANALYSIS AND EXPERIMENTAL DEMONSTRATION OF CONFORMAL ADAPTIVE PHASE-LOCKED FIBER ARRAY FOR LASER COMMUNICATIONS AND BEAM PROJECTION APPLICATIONS Ling Liu, Doctor of Philosophy, 2008 Dissertation Directed By: Professor Mikhail A. Vorontsov Institute for Systems Research and Department of Electrical and Computer Engineering, University of Maryland at College Park The primar...

background and aims. at present, cone beam computed tomography (cbct) has become a substitute for computed tomography (ct) in dental procedures. the metallic materials used in dentistry can produce artifacts due to the beam hardening phenomenon. these artifacts decrease the quality of images. in the present study, the number of artifacts as a result of beam hardening in the images of dental imp...

The previously proposed binary defocusing technique and its variations have proven successful for high-quality three-dimensional (3D) shape measurement when fringe stripes are relatively narrow, but they suffer if fringe stripes are wide. This paper proposes to utilize the binary dithering technique to conquer this challenge. Both simulation and experimental results show the phase error is alwa...

This paper presents a novel method to construct binary patterns for high-quality 3D shape measurement. The algorithm generates small patches using symmetry and periodicity, randomly initializes each pixels, optimizes the small patches through mutations, and finally tiles the optimized patches into full size patterns using again symmetry and periodicity. We will demonstrate that the proposed met...

In this paper we present an ultra low power all digital DLL operating near threshold voltage with lock in range of 80 200MHz. The DLL is immune to false locking problem and dithering around the lock point. Besides clock de-skewing and multiphase clock generation it can multiply the frequency by four. The DLL is implemented in 45nm PTM and operates at 0.7 V and dissipates 120uW at 200MHz. Keywor...

A proposed third-order noise-shaping accelerometer interface circuit enhances the signal-to-noise ratio, compared with previously presented interface circuits. The solution for the two-chip implementation is described and a novel cross-coupled correlated double sampling integrator is proposed. This scheme functions even with large parasitic capacitances between the sensor and the interface circ...

In the paper the combination of additive iterative algorithm with averaging of dithered samples is designed for self-correction of ADC linearity error. Iterative method is known as the aid for automated error correction and dithering uses to be applied for quantiser performance enhancement. Dither theory for Gaussian noise has been used for exhibition of new method abilities in ADC characterist...