BME 552 HW1 2009 SOLUTION

BME 552 HW1 2009 SOLUTION - BME552HW1AnswerKey 1.

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BME 552 – HW 1 – Answer Key 1. Build a mathematical model of the electrode using the three element model shown in class. Plot impedance as a function of frequency between 1Hz and 100kHz. Assume linear behavior. Initial conditions: tissue resistivity 150 Ohm cm, electrode radius 100 microns. Assume R elec (parallel resistance) is 10 MOhm. a. Plot impedance modulus and phase for initial conditions b. Change electrode radius to 50 microns, 200, 500 microns. Plot
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c. Consider roughness factor of electrode of 1.25, 1.5, and 2.0. Plot
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d. Change tissue resistivity to 100, 200 Ohm cm. Plot
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e. Briefly explain the changes that you see in the plots. a+b) In part b, we are changing the radius of the stimulating electrode. The radius of the electrode will affect its surface area, which in turn will affect the electrode/tissue interface capacitance (Cdl) and the resistance between the electrode and the tissue (Rt, series resistance). As a is increased, capacitance will increase and resistance will decrease. Conversely, decreasing a will decrease
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BME 552 HW1 2009 SOLUTION - BME552HW1AnswerKey 1.

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