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Displacement Sensing of an Active String Actuator Using a Step-Index Multimode Optical Fiber Sensor.

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Researchers developed a novel optical fiber sensor to measure the length of thin McKibben artificial muscles. This simple system accurately estimates the displacement of these compact pneumatic actuators.

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active string actuatordisplacement sensingstep-index multimode optical fiberthin artificial muscle

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Area of Science:

  • Robotics and Mechanical Engineering
  • Biomedical Engineering
  • Materials Science

Background:

  • McKibben artificial muscles are compact pneumatic actuators (1.8 mm outer diameter).
  • Accumulating these muscles creates an "active string actuator" with high contractile displacement.
  • Accurate length estimation is crucial for controlling active string actuators, but traditional sensors are unsuitable due to size and rigidity.

Purpose of the Study:

  • To propose and validate a novel, simple sensing method for estimating the length of active string actuators.
  • To overcome the limitations of bulky and rigid sensors in measuring the displacement of thin artificial muscles.

Main Methods:

  • Integrated a step-index multimode optical fiber with the active string actuator.
  • Utilized a light emitter and receiver to monitor light propagation through the optical fiber.
  • Correlated changes in light transmission with the actuator's length during operation.

Main Results:

  • Demonstrated a clear correlation between the optical fiber sensor's output and the actuator's length.
  • The proposed sensing system showed that light propagation changes predictably with actuator displacement.
  • Fundamental experiments confirmed the feasibility of the optical fiber sensing approach.

Conclusions:

  • The developed optical fiber sensing system is a viable method for estimating the displacement of active string actuators.
  • This simple, non-rigid sensor overcomes the limitations of conventional sensors for thin artificial muscles.
  • The findings pave the way for improved control of McKibben artificial muscle-based actuators.