In this presentation, I am going to explain Flexible capacitive based sensors for medical monitoring applications.

1. Flexible capacitive based sensor for medical
monitoring applications.
School of engineering Science and technology
University of Hyderabad
Presented by
Mohammad Azam

2. Outline
 Objectives
 Why flexible sensors?
 Why Capacitive based sensors ?
 Working principle
 Designing Approach
 Difference between synthesis and fabrication approach.
 Applications
 Conclusion
 References

3. To understand and working
principle of flexible based
capacitive sensors.
Designing approach of
capacitive based sensors.
Application of capacitive
based sensors in medical.
Objectives
WHAT WE WANT TO ACHIEVE

4. Why flexible sensors?
 Better accuracy
 Portable
 Compatible with body part
 Fast response
 Transparent option available
 Complicated structured is possible to design

5. Why Capacitive based sensors ?
 Simple working principle
 Easy to design
 Multifunctional sensors
 Cost effective

6. Working principle
C = C1 + C2 + C3 ……
𝐶 =
𝑘𝜀0𝐴
𝑑

7. Designing Approach
Designing Approach
Synthesis Approach Fabricated Approach

8. Synthesis Approach
Various synthesis methods available for capacitive based
sensors.
Such as chemical reduction method,
sol gel method,
Hydrothermal Synthesis
Most of the cases in the synthesis process make a composite
for suitable response.

9. Fabrication Approach
Thermal evaporation
Sputtering
Dip coating
Spinning
Pulse Laser Deposition (PLD)

10. Name of transparent flexible substrate
Polydimethylsiloxane (PDMS)
Indium Tin Oxide (ITO)
Poly(methyl methacrylate) (PMMA)
Polyethylene Terephthalate (PET)

11. Difference between synthesis and fabrication approach.
Synthesis approach Fabrication approach
Simple approach Complicated approach
Cost effective Costly
Response time is high Response time is not much high
Work in all direction Work in some specific direction
Some specific difference between fabrication and synthesis approach of devolved smart materials

12. Applications

13.  Integrating multifunctional sensing components in to
one device is an important advance in wearable
electronics.
 The function of detecting multiple signals such as
strain, pressure, temperature, humidity, and so on into
a single device to provide more comprehensive human
health and environmental information
Multifunctional Sensors

14. Capacitive sensor for eye pressure monitoring
 Frequency is vary with pressure
S. Rajagopalan et al. 2008

15. Conclusion
Single sensor can be used for multiple sensors.
We can design sensor according to our needs.
Flexible sensor response time and accuracy are better.
Cost effective
Easy to fabricate the sensors.

16. References
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2. Song, Y. M. et al. Digital cameras with designs inspired by the arthropod eye. Nature 497, 95–99 (2013).
3. Quan Y, Wei X, Xiao L et al (2017) Highly sensitive and stable flexible pressure sensors with micro-
structured electrodes. J Alloys Compd 699:824– 831 .
4. Quan Y, Wei X, Xiao L et al (2017) Highly sensitive and stable flexible pressure sensors with micro-
structured electrodes. J Alloys Compd 699:824– 831.
5. S. Rajagopalan, M. Sawan, E. Ghafar-Zadeh, O. Savadogo, and V. P. Chodavarapu, “A Polypyrrole-based
Strain Sensor Dedicated to Measure Bladder Volume in Patients with Urinary Dysfunction,” Sensors, Vol.
8, pp. 5081-5095, 2008.

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