2018 International Conference on Material Strength and Applied Mechanics (MSAM 2018) Yuya Koyama, Michiko Nishiyama, Kazuhiro Watanabe Faculty of science and engineering, Dept. of Information Systems Science, Soka University

1. Smart sensing textile with embedded
hetero-core optical fiber sensors into the
structure for monitoring human vital
signs and motion
Yuya Koyama, Michiko Nishiyama, Kazuhiro Watanabe
Faculty of science and engineering, Dept. of Information
Systems Science, Soka University

2. Contents
1. Introduction
2. Hetero-core optical fiber sensor
3. Smart textile and its sensor performance
4. Body joint motion detection test
5. Vital signs detection test
6. Conclusion

3. Background
Unconscious and unconstrained sensing
Position，Motion,
Vital signs
Feedback, Alert
Healthcare
Sports Lifestyle support
Monitoring body motion and
vital signs
Wearable sensors
Wear itself can sense body motion
and vital signs

4. Conventional research
MVN motion capture
(XSENS .inc)
Inertial sensor
Tognetti A et al, Wearable kinesthetic system
for capturing and classifying upper limb gesture
in post-stroke rehabilitation., Journal of
NeuroEngineering Rehabiltation, 2-8, (2005).
Conductive fabrics
Enzo Pasquale Scilingo et al, "Strain-sensing
fabrics for wearable kinaesthetic-like
systems," in IEEE Sensors Journal, vol. 3, no.
4, pp. 460-467, Aug. 2003.
G. Cho, K. Jeong, M. J. Paik, Y. Kwun and M. Sung, "Performance Evaluation of
Textile-Based Electrodes and Motion Sensors for Smart Clothing," in IEEE Sensors
Journal, vol. 11, no. 12, pp. 3183-3193, Dec. 2011.

5. Conventional research
Zamir Ahmed Abro et al, Development of a smart
garment for monitoring body postures based on FBG and
flex sensing technologies, Sensors and Actuators A:
Physical, Volume 272, 2018
Body motion and vital signs measurement
using optical fibers
Optical fiber sensor
 Flexible and light-weight material
 No electro-magnetic interference
 No electrical contact
M. Rothmaier et al., "Photonic textiles for pulse
oximetry," Opt. Express 16, 12973-12986 (2008).
J. P. Carmo et al., "Application of Fiber Bragg Gratings to
Wearable Garments," Sensors Journal, IEEE , vol.12, no.1,
pp.261,266, Jan. 2012

6. Hetero-core portion
(1~2mm)
Cladding
125μm
Core 9μmCore 5μm
Transmission line
Core 9μm
Hetero-core optical fiber sensor
No need for temperature compensation
Real-time measurement
0
1
2
3
4
5
0 2 4
Opticalloss[dB]
Displacement [mm]
Displacement
Transmission line

7. The sensor can be embedded into the material
of clothes without uncomfortable feeling
Smart textile using hetero-core optical fiber
Weaving hetero-core optical fiber into textile structure
Integration of clothes using the smart textile
Body joint motion and vital signs detection
Purpose
Hetero-core optical fiber
Unconscious and unconstrained smart clothes

8. Optical fiberThread
60 mm
85 mm
Hand
weaving
machine
Weaving Optical fiber line
Fabrication of smart textile

9. Structure of smart textile
Hetero-core portion
Warp thread
Structure
1.0 (mm)
0.5(mm)
Optical fiber
Woof thread
(horizontal thread)
Hetero-core
optical fiber
Warp thread
(vertical thread)
Cross-sectional view

10. Sensor performance
Bend
Stretch
Press

11. Experimental setup
LED/PD
(λ=1.31 μm) Optical fiber
line
AD converter PC
Sampling frequency:
20 Hz
Smart textile
Smart textile
Back

12. Inertial
sensor

13. θFlexion Extension
Smart textile
Result

14. Experimental setup for vital signs detection
The textile is sewed on
the inside of clothes

15. Respiration
Heartbeat
Filtering
Real time response
Result

16. Conclusion
Smart textile using hetero-core optical fiber
 Fabrication of smart textile by weaving hetero-core optical fiber
 Smart textile detect the deformation produced by bend, stretch,
and press
 Body joint motion and vital signs were monitored by the smart
textile sawed on clothes
Smart textile using hetero-core optical fiber is useful for smart
clothes monitoring body motion and vital signs

17. Thank you for your kind attention.
Paper ID: MS1198