PulseOximetry-Report9

PulseOximetry-Report9 - Lab Report#9 Pulse Oximetry BMEN...

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Lab Report #9:  Pulse Oximetry BMEN 305  Date performed: 11/08/07 Date due: 11/15/07
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P a g e  | 2 Table of Contents 1. Introduction………………………………………………….………………. ………………………………..…………….3 2. Materials and Methods………………………..……………….………………. ……………….………………..……3 3. Results and Discussion……………….……………….………………. …………………….…………….…..…..…..3 Part I……………………………….. ………………………………………………………………………………4-5 Part  II…………………………………………………………………………………. ……………………..……5-7 Part  III…………………………………………………………………………………………… ………….…..7-13 Part  IV…………………………………………………………………………………………… ………..…..14-15 4. Conclusion………………………….……………….……………….………………. …………………….………………16
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P a g e  | 3 Introduction Based on the given circuit diagram, we are to construct a circuit to voltage converter. A  photodiode will acquire the signal from an LED and then be amplified. Physiological  signals will then be measured once the entire circuit works. The heart rate will be  calculated from the data acquired by the circuit.  Materials and Methods Part I
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P a g e  | 4 Build the circuit shown in Figure 1.1. Choose a voltage Vin and R1 so that the current  rating of the LED is not violated. Use the Func out on the NI ELVIS as the input to the  circuit. Use the LM 741 on the receiver side to make the current to voltage converter.  Connect the output of the circuit to CH A+, and connect CH A- to ground. Give a 1 Hz  signal square wave input to the circuit, and observe the output on the oscilloscope.  Disconnect the Func out from the circuit and connect the variable power supply on NI  ELVIS to the circuit. Put a finger in the separation between the LED and the photodiode,  and make sure the finger remains still. Observe the output on the oscilloscope, and  measure its frequency. Take 5 readings of the output frequency and calculate the mean,  which is the heart rate. Figure 1.1: Part I circuit Part II Disconnect the IR LED and the IR photodiode from the circuit. Connect a red LED and  BG photodiode to the circuit and repeat the steps in part I.  Part III Write a data acquisition VI in LabVIEW. Filter the incoming signal using a LP filter and  record the data on a file. Record the data once using the Red LED and another time for 
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