Choma
Christin Choma, Draper, UT US
Patent application number | Description | Published |
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20130240763 | APPARATUS AND METHODS FOR REDUCING SOILING OF RADIO-OPAQUE SHIELDS - Shields that attenuate ionizing radiation (e.g., x-rays, gamma rays, etc.) include outer layers that minimize soiling. Removable shells that minimize soiling of shields for attenuating ionizing radiation are also disclosed. The soil-minimizing outer layers and shells may be formed from materials that resist soiling, that counteract soiling, or from which soiling may be readily removed. Methods for minimizing soiling of radio-opaque shields are also disclosed. | 09-19-2013 |
John Choma, San Dimas, CA US
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20110032033 | PRE-DISTORTION AND MEMORY COMPENSATION APPARATUS - Pre-distortion and memory compensation apparatuses and methods for a non-linear component are provided. The apparatus comprises an adaptive block for generating a plurality of correlation coefficients, which are used to weight a plurality of synthesis work functions to pre-distort a given signal. The adaptive block can be driven by an error signal generated from a feedback signal from the non-linear component output signal and a delayed version of the input signal. The apparatus is capable of being operated directly at radio frequency. Also provided are apparatuses and methods for generation of quadrature signals, transconductance amplification employing negative resistance, variable-gain amplification, and envelope detection. | 02-10-2011 |
Michael Choma, Durham, NC US
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20100201991 | Methods, Systems and Computer Program Products for Characterizing Structures Based on Interferometric Phase Data - Structure profiles from optical interferometric data can be identified by obtaining a plurality of broadband interferometric optical profiles of a structure as a function of structure depth in an axial direction. Each of the plurality of interferometric optical profiles include a reference signal propagated through a reference path and a sample signal reflected from a sample reflector in the axial direction. An axial position corresponding to at least a portion of the structure is selected. Phase variations of the plurality of interferometric optical profiles are determined at the selected axial position. A physical displacement of the structure is identified based on the phase variations at the selected axial position. | 08-12-2010 |
Michael Choma, Hamden, CT US
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20140111671 | Systems and Methods for Imaging Using a Random Laser - Systems and methods are provided for imaging using complex lasers. In general, a complex laser may be used as an electromagnetic source for an imaging application. The use of a lower spatial coherence configured complex laser in imaging applications may advantageously mitigate coherent artifacts in imaging such as cross-talk and speckle and improve overall image quality. Imaging applications where a complex laser may be useful include both incoherent imaging applications, such as digital light projectors and traditional microscopy, and coherent imaging applications, such as optical coherence tomography (OCT) and holography. The systems and methods provided also enable controlling the degree of spatial coherence of a complex laser. | 04-24-2014 |