Application-Based Production and Testing of a Core–Sheath Fiber Strain Sensor for Wearable Electronics: Feasibility Study of Using the Sensors in Measuring Tri-Axial Trunk Motion Angles
Abstract
:1. Introduction
2. Materials and Methods
2.1. General Materials and Methods
2.2. Percolation Threshold for H3078 and Carbon Black
2.3. Sensor Production
2.3.1. H3078 Coated with H3078:Carbon Black (50 wt%)
2.3.2. PEU Coated with H3078:Carbon Black (50 wt%)
2.4. Linear Stage (Tensile and Electronic) Setup and Testing
2.4.1. Random Wave Pattern Testing
2.4.2. Normalized Root Mean Squared Error (NRMSE) Analysis
2.4.3. Method for Random Forest Machine Learning Algorithm Analysis (RFMLA)
2.5. Method for Real Application Strain Range Calculation
2.6. Smart Sensor Integrated Sleeveless Shirt
2.6.1. Sensor Placement
2.6.2. Smart Sleeveless Shirt:
2.6.3. Experimental Setup
2.6.4. Participants
2.6.5. Study Protocol
2.6.6. Reference Angle Measurement
2.6.7. Signal Processing
2.6.8. Evaluation
3. Results
3.1. Sensor Characterization
3.1.1. Determining the Working Range of Desired Sensor
3.1.2. Sensor Fabrication, Material Selection, and Basic Sensor Properties
3.1.3. Strain Limit of Sensors
3.1.4. Sensor Conditioning
3.1.5. Sensor Linearity
3.1.6. Effect of Strain Rate on Sensor Performance
3.1.7. Sensor Testing: Random Wave Pattern to Simulate Real Events
3.1.8. Sensor Optimization Using Machine Learning Algorithms
3.2. Smart Sleeveless Shirt Testing
4. Discussion
- (1)
- Could be made from readily available materials.
- (2)
- Would be reliable and accurate within the intended working range for our application.
- (3)
- Would be accurate at tracking strain when exposed to random movements that are typical in prototype devices over longer testing periods.
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Conflicts of Interest
References
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Categories | Participant |
---|---|
Age (years) | 28 (3.3) |
Height (cm) | 177 (7.6) |
Weight (kg) | 75 (9.8) |
Trial Number | Movement Condition | Movement Type |
---|---|---|
1–3 | Rotation | Uniaxial |
4–6 | Lateral Bending (LB) | Uniaxial |
7–9 | Flexion | Uniaxial |
10–12 | Slouching | Uniaxial |
13–15 | Flexion + Lateral Bending | Multiaxial |
16–18 | Flexion + Rotation | Multiaxial |
19–21 | Lateral Bending + Rotation | Multiaxial |
22–24 | Random Combination | Multiaxial |
Sample | NRMSE a | NRMSE b | RFMLA NRMSE c |
---|---|---|---|
H3078 core | 7.7% | 15% | - |
cH3078 core | 7.1% | 6.4% | 1.6% |
PEU core | 9.3% | 16% | - |
cPEU core | 5.0% | 6.3% | 2.6% |
Ψ | θ | ϕ | |||||||
---|---|---|---|---|---|---|---|---|---|
Speed | RMSE (Deg) | NRMSE (%) | RMSE (Deg) | NRMSE (%) | RMSE (Deg) | NRMSE (%) | |||
Slow | 0.94 | 4.12 | 5.05 | 0.93 | 3.35 | 4.70 | 0.92 | 3.26 | 5.73 |
Moderate | 0.96 | 3.61 | 4.55 | 0.94 | 3.12 | 4.09 | 0.93 | 3.03 | 5.10 |
Fast | 0.92 | 5.06 | 5.82 | 0.90 | 4.12 | 5.25 | 0.88 | 4.02 | 6.55 |
Average | 0.94(0.02) | 4.26(0.73) | 5.14(0.64) | 0.92(0.02) | 3.53(0.52) | 4.68(0.58) | 0.91(0.03) | 3.44(0.52) | 5.79(0.73) |
ψ | θ | ϕ | |||||||
---|---|---|---|---|---|---|---|---|---|
Movement | RMSE (deg) | NRMSE (%) | RMSE (deg) | NRMSE (%) | RMSE (deg) | NRMSE (%) | |||
Rotation | 0.94 | 3.23 | 3.91 | 0.97 | 1.66 | 2.41 | 0.94 | 2.45 | 3.73 |
Lateral Bending | 0.93 | 3.65 | 4.32 | 0.83 | 3.60 | 3.07 | 0.98 | 1.94 | 2.84 |
Flexion | 0.97 | 3.08 | 3.49 | 0.85 | 4.16 | 3.52 | 0.87 | 3.13 | 4.34 |
Slouching | 0.95 | 2.39 | 3.39 | 0.93 | 1.17 | 2.85 | 0.94 | 2.12 | 4.26 |
Flexion + Lateral Bending | 0.87 | 4.27 | 8.78 | 0.89 | 4.08 | 4.85 | 0.92 | 3.12 | 6.04 |
Flexion + Rotation | 0.92 | 4.60 | 7.10 | 0.87 | 4.36 | 6.83 | 0.82 | 3.02 | 8.03 |
Lateral Bending + Rotation | 0.92 | 4.29 | 7.25 | 0.86 | 4.26 | 5.83 | 0.97 | 3.38 | 5.42 |
Random Combination | 0.85 | 5.13 | 7.74 | 0.83 | 4.90 | 10.67 | 0.85 | 4.48 | 10.09 |
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Rezaei, A.; Cuthbert, T.J.; Gholami, M.; Menon, C. Application-Based Production and Testing of a Core–Sheath Fiber Strain Sensor for Wearable Electronics: Feasibility Study of Using the Sensors in Measuring Tri-Axial Trunk Motion Angles. Sensors 2019, 19, 4288. https://doi.org/10.3390/s19194288
Rezaei A, Cuthbert TJ, Gholami M, Menon C. Application-Based Production and Testing of a Core–Sheath Fiber Strain Sensor for Wearable Electronics: Feasibility Study of Using the Sensors in Measuring Tri-Axial Trunk Motion Angles. Sensors. 2019; 19(19):4288. https://doi.org/10.3390/s19194288
Chicago/Turabian StyleRezaei, Ahmad, Tyler J. Cuthbert, Mohsen Gholami, and Carlo Menon. 2019. "Application-Based Production and Testing of a Core–Sheath Fiber Strain Sensor for Wearable Electronics: Feasibility Study of Using the Sensors in Measuring Tri-Axial Trunk Motion Angles" Sensors 19, no. 19: 4288. https://doi.org/10.3390/s19194288