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Transcript

Presenter : Yu-Chun Hua Adviser : Dr. Ji-Jer Huang Date : 99.12.09 Paper review(1) purpose From :R. A. Stiz, P. Bertemes-Filho, A. Ramos, V. C. Vincence. “Wide Band Howland Bipolar Current Source using AGC Amplifier “IEEE LATIN AMERICA TRANSACTIONS, VOL. 7, NO. 5, SEPTEMBER 2009 Purpose • Optimizing the output impedance (Zout) and voltage controlled • current source (VCCS) In this system, it uses a current source balanced (also called "bipolar“) Automatic gain control (AGC) : 自動控制增益放大器 Paper review(1) materials and methods Howland Circuit Paper review(1) materials and methods R2 R5 R3 R1 R4 I out Vin R2 R3 R1 Paper review(1) results Amplitude of the current source output as a function of frequency, using a load of 500 Ω. Amplitude of the current source output as a function of frequency, using a capacitive load. Paper review(2) purpose From: Tushar Kanti Bera and J. Nagaraju ﹐” A Simple Instrumentation Calibration Technique for Electrical Impedance Tomography (EIT) Using A 16-Electrode Phantom ” 5th Annual IEEE Conference on Automation Science and Engineering Bangalore, India, August 22-25, 2009 Purpose Intended to investigate the phantom responses for different electrode geometry Electrode array position in bathing solution column and the instrumentation is calibrated accordingly Paper review(2) materials and methods A. B. C. D. Instrumentation(VCO) EIT-Phantom Forward Solution with Forward Solver Boundary Potentials Measurements B. EIT-Phantom All the lead wires are of equal lengths CGE or CME is placed at the phantom centre and connected to the ground Prepared with a 0.5%(w/v) solution of KCl Practical biological phantom with stainless steel electrodes C. Forward Solution with Forward Solver Forward Problem (FP) is the basis of EIT and it is essentially to be solved to calculate the boundary potential for estimating the conductivity update (Δσ) for each iteration in Inverse Problem (IP) . Studying the FP, for an EIT system, the instrumentation error can be detected to eliminate the noise in the voltage signal for better image resolution . Equation A relation between the measured potentials and the domain conductivity equation using FEM as: K I [Ф] is the vector of nodal voltage [K(σ)] is the transformation matrix which is a function of elemental conductivities of the FEM mesh [I] is the vector of currents at each nodes Equation F is the Jacobean matrix which formed from the transformation matrix K and it is defined as: F gh V g ds h g = 1, 2 …number of element h = 1, 2…M [M = (number of data measured per current x (number of current projections)] projections)