Eyelid Motion Monitor
Instructor: Adi Hanuka
By: Alon Berger Maor Itzhak
11.6.2014
Spring Semester 2014
1. Quick Review of the Last Presentation
2. What We Planned To Do• Problems Encountered & Consequences
3. Our Progress So Far
4. What’s Next
Outline
First “Intuition” of the signal
Plans for Future Experiments
Last Time
Main effects:◦ Amplifies only the change from the reference
voltage
Side effects:◦ Amplitude – Frequency dependence ◦ Transient response
AC Effects
Test Points
Hall Probe
Amp
Coupling
A to D
A B C D
Analog Card
1. Frequency Dependence of Hall Sensor (Inductor Experiment)
2. Frequency Dependence of the System:2.A: Motorized Experiment on test point A2.C: Motorized Experiment on test point C2.D: Motorized Experiment on test point D
3. Experiment on Glasses
Experiments
Goals: ◦ Understand the probe’s dependence on frequency◦ Is there capacitance in the probe?
SetUp:◦ Hall probe circuit◦ Inductor circuit
1. Inductor Experiment
Results:
1. Inductor Experiment
0 20 40 60 80 10060
65
70
75
80
85
90
Hall Detector Output Voltage
Middle of Inductor
Edge of Inductor
Frequency [Hz]
Volt
age P
P [
mV
]Noise Amplitude:16mV
Measurement Error: 2mV
Conclusion:
◦ The output amplitude is constant and independent of the frequency
◦ The hall sensor is not equipped with a built-in capacitor
1. Inductor Experiment
Goal: Understanding the Probe’s response to blink like motion in different frequencies
Setup: ◦ Hall probe circuit◦ A magnet attached to a pole, controlled by a
motor performing a periodical arced motion◦ Magnet: Class = N50, Dimensions = 3x0.65mm
A
2.A: Motorized Arm Experiment
Video Demonstration
◦ Low Frequency Behavior (4Hz)
◦ High Frequency Behavior (8Hz)
2.A: Motorized Arm Experiment
2Hz:◦ Constant peak◦ Two pulses
per period
6Hz:◦ Two pulses
per period◦ Different height
each pulse◦ Same height
each period
2.A: Motorized Arm ExperimentT = 0.5 sec
T = 0.166 sec
Technical Difficulties: The system is not compatible with frequencies
over 4Hz
Difficulties with keeping a fixed distance between the pole and the hall probe
Inability to set a fixed aperture for the pole’s motion
Difficulties with measuring the distance between the pole and the magnet in a sufficient scale
2.A: Motorized Arm Experiment
Results: Near-field effects:
2.A: Motorized Arm Experiment
Results: The peak amplitude is constant over the frequency.
2.A: Motorized Arm Experiment
0 1 2 3 4 5 6 7 8 92.5
2.55
2.6
2.65
2.7
2.75
2.8
Peak Amplitudes
First Peak Second Peak
Frequency [Hz]
Volt
age [
V]
A new setup is required
Temporary Solution : Circular motion
New setup (*video demonstration):
◦ Hall probe circuit
◦ New pole
◦ A magnet (class N50, 3x0.65mm) attached to a pole, controlled by a motor performing fully circular motion
2.A: Motorized Arm Experiment
Results: Amplitude◦ Expected: constant
2.A: Motorized Arm Experiment
0 0.5 1 1.5 2 2.5 32.3
2.4
2.5
2.6
2.7
2.8
2.9
3
Signal's Peak
Frequency [Hz]
Sig
nal's P
eak [
V]
Results: Pulse’s Width◦ Expected:
2.A: Motorized Arm Experiment
0 0.5 1 1.5 2 2.5 3 3.5 4 4.50
10
20
30
40
50
60
70
80
90
R² = 0.999527100194315
Pulse's Width
Period [Sec]
Wid
th [
mSec]
Conclusions:
Amplitude is constant regardless of the frequency
Near field effects
Width proportional to T (Period Time)
Better setup is still required
2.A: Motorized Arm Experiment
2.C: Motorized Arm Experiment
Goal: Understand the output of the analog card
Set up: Same magnet, motor & pole.◦ Analog card positioned in front◦ Upper Sensor connected to scope
Tested 11 frequencies up to 2.8Hz
C
Results:
2.C: Motorized Arm Experiment
(Frequency = 0.2Hz)
Expected effect of the Analog Card:◦ Transfer Function
2.C: Motorized Arm Experiment
Results: Amplitude
2.C: Motorized Arm Experiment
0 0.5 1 1.5 2 2.5 30
1
2
3
4
5
6
Amplitudes
Positive PeaksNegative PeaksReference Voltage
Frequency [Hz]
Volt
age A
mplitu
de [
V]
0 1 2 3 4 50
20
40
60
80
100
120
140
R² = 0.998938674264566
Width of Positive Pulse
T [sec]
Wid
th [
msec]
Results: Pulse Width◦ Expected:
2.C: Motorized Arm Experiment
Conclusions and points to note:
Frequency Response (Transfer Function) effects
Unexpected descent in the positive peak amplitude
Negative Peaks are an indication of velocity!
Is the pulse width actually that interesting?
2.C: Motorized Arm Experiment
Goal: Understanding the output signal of the whole system
Set up: Same motor & pole.◦ Analog card positioned in front of the pole while
connected to the digital card
Tested 11 frequencies up to 2.8Hz
2.D: Motorized Arm Experiment
D
Results:
2.D: Motorized Arm Experiment
(Frequency = 0.5Hz)
Conclusions:◦ Digitization of the signal – discrete voltage values
◦ Same frequency dependence as point C
◦ Points C, D – same signal
◦ Change in y axis’s scale
2.D: Motorized Arm Experiment
Digital (Test Point D) Analog (Test Point C)
Goal:◦ Observation of response of the whole system to
controlled blinks◦ Comparison of blinks and arched motion setup
Experiment process – Controlled blinks:◦ 5 slow blinks◦ 5 fast blinks◦ 5 very fast blinks
3. Preliminary Experiments With Glasses
Results:◦ In fast successive blinks, amplitude rises
◦ Unexpected effects (horns)
Depends on the position of the probe?
3. Preliminary Experiments With Glasses
(Upper Sensor)(Lower Sensor)
Eye shuts Eye opens
New Idea: Bend the Sensors?
Reduces risk of passing the probe!◦ Graph: Eye closure followed by eye opening◦ Blue line: Bent sensor. Red line: Original
New Idea: Bend the Sensors?
Signal changes drastically with the position of the glasses
Slight changes to the position of the probes affect the signal dramatically
Conclusions
Amplitude Dependence on Frequency:◦ In Hall Probe: None◦ In Analog Card:
Transfer Function Decreases as a result of an additional effect
Width: What can we learn from it?
Effects of the Capacitors in the Analog Card:Changes to the Signal Shape
Signal after A/D: Consistent with output of Analog Card
Position of Glasses: CRUCIAL for obtaining expected results
Bending the probes: A good idea to investigate
Summary
We believe we know what signal to expect
It’s time to collect data from patients◦ Learn about the variance between them
Find a mathematical model
New glasses are needed:◦ Most up-to-date analog card scheme◦ Bent probes◦ Better positioned and more comfortable
What’s Next
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