biom5100-final-2008 - BIOM5100: Final Exam Fall 2008 page...

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Unformatted text preview: BIOM5100: Final Exam Fall 2008 page 1/3 Carleton University, Systems and Computer Engineering BIOM 5100/SYSC 5302: Final Exam : December 10, 2008 Instructor: Andy Adler Instructions:- This exam has 3 pages and 3 questions. Answer any two (2) of them. Marks are indicated- You have 180 minutes to complete this exam.- This is a closed book exam; however, you are permitted to bring one 8 . 5” × 11” sheet of notes.- Write your answers on an examination booklet. You may take this examination paper with you- You may use the following equations and constants: E = mc 2 R c = (8 ηL ) / ( πr 4 ) E = E + RT nF lna c Charge e- : 1 . 6 × 10- 19 Coul c = 3 × 10 8 m s L c = ( ρL ) / ( πr 2 ) R = 8 . 31 J/(K · mol) P atm = 101 . 3 kPa = 760 mmHg F = ma C = (Δ V ) / (Δ P ) F = 9 . 65 × 10 4 Coul mol 1 mol = 6 . 02 × 10 23 particles P = ˙ V R P ( V N ) α = Const dV + V αP dP = 1 ρ dN Resistivity: ρ blood = 450Ω · cm ρ air = 1 . 21 kg m 3 ρ blood = 1060 kg m 3 η air = 1 . 8 × 10- 6 Pa · s η blood ≈ 3 . × 10- 3 Pa · s 1. ECG Measurement We would like to monitor the heart rate of a subject while she is exercising. Exercise causes three main difficulties for measurement of the ECG: a) movement artefacts, b) sweat on the electrodes, and c) artefacts from the EMG in the ECG. We consider two different electrodes systems to measure the ECG. #1) we place two Ag/AgCl electrodes each shoulder of the subject, and #2) we ask the subject to hold onto stainless steel handles which act as electrodes. (a) (5 points) Briefly describe the origin of movement artefacts. Use an equation or diagram if necessary. Do movement artefacts differ for electrodes #1 and #2? Explain ( ≤ 50 words) . (b) (5 points) Briefly describe the effect of sweat on the electrodes. Show equivalent electrical models of the electrodes. Does sweat affect electrodes #1 and #2 differently? Explain ( ≤ 50 words) ....
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This note was uploaded on 09/22/2009 for the course BIOMEDICAL BIOM5101 taught by Professor Andyadler during the Fall '09 term at University of Ottawa.

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biom5100-final-2008 - BIOM5100: Final Exam Fall 2008 page...

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