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SCIENCE CHINA Information Sciences, Volume 61 , Issue 6 : 060417(2018) https://doi.org/10.1007/s11432-018-9397-0

Electromechanical modeling of eye fatigue detecting using flexible piezoelectric sensors

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  • ReceivedJan 21, 2018
  • AcceptedMar 21, 2018
  • PublishedMay 15, 2018

Abstract


Acknowledgment

This work was supported by National Natural Science Foundation of China (Grant Nos. 11322216, 11621062).


References

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  • Figure 1

    (Color online) (a) Photograph of a piezoelectric fatigue sensor connected with ACF cable; (b) photograph of the core functioning part of the piezoelectric fatigue sensor; (c) and (d) photographs of a volunteer wearing the sensor with eyelid closed and open.

  • Figure 2

    (Color online) (a) Schematic diagram of the piezoelectric device; (b) profile diagram of the central part of piezoelectric device; (c) schematic diagram of the piezoelectric device conformally deforming with the eyelid epidermis.

  • Figure 3

    (Color online) Schematic of geometrical relationship between the eyelid distance and end-to-end displacement of the sensor.

  • Figure 4

    (Color online) (a) and (c) output voltage signals collected from in vivo test of a volunteer wearing the sensor; (b) and (d) theoretical predictions of the eyelid distance based on the measured data in (a) and (c).

  • Figure 5

    (Color online) Dependence of the normalized peak voltage on the normalized end-to-end displacement of the sensor under different normalized blinking speed.

  • Figure 6

    (Color online) Scaling law for the normalized peak voltage and the normalized parameter ${\bar~\mu~_{33}}{n_{\rm~p}}{A_{\rm~p}}R/{n_{\rm~s}}{h_{\rm~p}}T$.