P11011: Modular Motion Tracking Knee Flexion Unit V1
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Test Product Concept(s)

Reproducibility Testing
Flex Sensor - Bent at End (Near Wire)
Degrees Bent Output Voltage - Trial 1 (V) Output Voltage - Trial 2 (V) Output Voltage - Trial 3 (V)
0 2.116 1.98 2.09
20 2.102 1.93 2.09
40 1.958 1.03 1.48
60 1.51 0.659 1.02
80 1.297 0.818 0.813
100 2.43 0.592 2.27
120 2.14 2.22 2.12
140 2.16 1.998 1.9
160 2.03 1.97 2.31
180 2.215 2.35 1.31
Flex Sensor - Bent at Tip (End of Sensor)
Degrees Bent Output Voltage - Trial 1 (V) Output Voltage - Trial 2 (V) Output Voltage - Trial 3 (V)
0 2.08 2.28 2.24
20 3.45 2.95 3.91
Flex Sensor - Bent at Middle
Degrees Bent Output Voltage - Trial 1 (V) Output Voltage - Trial 2 (V) Output Voltage - Trial 3 (V)
0 2.26 2.3 2.16
20 2.93 3.22 2.86
40 3.27 3.21 3.04
60 2.89 3.05 2.95
80 3.6 3.12 3.48

From the tables shown above, it can be seen that the Flex Sensor is very unreliable. It varies a lot from trial to trial, and would not be a good choice to reproduce results everyday for the Knee Flexion device.

Potentiometer
Degrees Rotated Output Resistance - Trial 1 (Kohms) Output Resistance - Trial 2 (Kohms) Output Resistance - Trial 3 (Kohms)
0 97.59 97.458 97.493
20 96.76 96.929 97.478
40 87.123 88.65 88.605
60 78.003 78.73 88.605
80 66.68 69.09 71.375
100 63.43 62.74 64.76
120 57.61 58.036 58.337
140 53.225 52.238 52.616
160 48.87 48.154 46.183
180 44.09 43.623 41.591

As can be seen from the above table, the potentiometer is a very reliable device with little variability from trial to trial. This device is fairly easy to set-up and use, and would be a good choice to use for the Knee Flexion device.

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