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Medical Instrumentation Essay

1245 words - 5 pages

|
Activity/Tremor Detector |
EEE 4202C-Medical Instrumentation Design |
Exercise 1Group #6 |
Group Members:
Diego RamirezKarina AlonsoEric GundersonWilliam NoundouAlejandro BuitragoRaidel Martinez |
3/7/2012
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Table of Contents
Abstract……………………………………………………………………………………………3
Steps Taken………………………………………………………………………………………..3
Data Recorded...………………………………………………………………………………...4-5
Data Tables………………………………………………………………………………………..6
Observations………………………………………………………………………………………7
Answered Questions………………………………………………………………………………7
Lessons Learned…………….……………………………………………………………………..8
Appendix…………………………………………………………………………………………..9
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Abstract
The purpose of this exercise is to analyze ...view middle of the document...

1. 3 The transducer was moved to produce a response and the results displayed in the oscilloscope were recorded. (Shown in Figure 2)
1. 4 After the measurements all the data was recorded to our tables (Figure 7&8).
1. 5 This process should be repeated for the transducers with extra mass attached to it (As shown in figure 4) in order to provide a differing signal response (as shown in Figure 5).
1. 6 With all the measurements taken and calculations done, the Bode Plot was created (Shown in figure 3,6)

Data Recorded

Figure 1. No Mass Piezoelectric transducer connected to oscilloscope. (1.1-1.3)

Figure 2. No Mass Transducer oscilloscope signal. (Step 1.3)

Figure 3. Massless Transducer Bode Plot and Phase Diagram. (Step 1.4)

Figure 4. 2.2g Mass Attached Piezoelectric Transducer connected to oscilloscope. (Steps 1.1- 1.3)

Figure 5. 2.2g Mass attached transducer oscilloscope signal. (Step 1.3)

Figure 6. 2.2 g Mass Attached Transducer Bode Plot and Phase Diagram. (Step 1.4)

Data Tables
Figure 7: Quantifies the output attained from the oscilloscope in Figure 2 & 5 and lists parameters used to calculate the transfer functions in Table 2. Refer to appendix for functions.
Transducer | Piezo-electric (Standard Mass) | Piezo-electric(Massless) | Piezo-Electric--Calculated--(Target Mass) |
Mass Aggregate (g) | 0.75g | 0g | 8.66g |
Voltage Amplitude at Peak 1 | 165mV | 395mV | N/A |
Voltage Amplitude at Peak 2 | 100mV | 340mV | N/A |
P-P Time Period | 45ms | 5.8ms | N/A |
Logarithmic Decrement(Λ) | 0. 4947 | 0.1643 | N/A |
Slope(k) | 6.54*10-5 | 10.6*10-7 | 6.54*10-5 |
Ks | 15297.5 | 944465.96 | 15297.5 |
Natural Frequency (ωn) | 142.82 | 1122.18 | 43.9822 |
Damping Ratio(ζ) | 0.07849 | 0.02614 | 0.024165 |
Static Sensitivity(K) | 1.3334 | 1.3336 | 1.3336 |

Figure 8: Shows the transfer function for each Pizo-electric transducer mass.
Transducer | Pizo-electric (Standard Mass) | Pizo-electric(Massless) | Pizo-Electric(Target Mass) |
Mass (g) | 0.75g | 0g | 8.66g |
Transfer Function | 1.3336s2+58.7s+1.259*106 | 1.3334s2+22.42s+24,000 | 1.3336s2+2.13s+1,934 |

Observations
In our experiment we carried out three different tests using three different masses on a piezoelectric transducer. First we used a 0 mass piezoelectric transducer and we discovered that it does not provide a uniform response over the 3-7 Hz frequency range. Additionally, the peak to peak voltage is rather high at 395-340 mV. Then we increased the mass of the piezoelectric transducer to approximately 0.75 g (1.8g total with wires) and we discovered that the amplitude response is acceptable over the specified tremor frequency range with a variation of 0.8 dB with a peak to peak voltage of 165-100 mV. We did further testing with a mass of 2.2 g total...

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