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Updated: Jan 29, 2026

Three-dimensional Optical-resolution Photoacoustic Microscopy
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Optical Microscopy for High-Resolution IPMC Displacement Measurement.

Dimitrios Minas1, Kyriakos Tsiakmakis1, Argyrios T Hatzopoulos1

  • 1Department of Information and Electronic Engineering, International Hellenic University (IHU), 57400 Thessaloniki, Greece.

Sensors (Basel, Switzerland)
|January 28, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a low-cost optical system and tracking algorithm for precise measurement of micro-displacements in Ionic Polymer-Metal Composite (IPMC) actuators. The system enables real-time monitoring and fault detection in aqueous environments.

Keywords:
electronic circuitmicro-displacement measurementoptical displacement sensortip tracking algorithm

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Area of Science:

  • Materials Science and Engineering
  • Robotics and Control Systems
  • Optical Metrology

Background:

  • Ionic Polymer-Metal Composite (IPMC) actuators are widely used in soft robotics and biomedical devices.
  • Accurate measurement of micro-displacements is crucial for understanding and optimizing IPMC performance.
  • Existing measurement techniques can be costly, complex, or unsuitable for aqueous environments.

Purpose of the Study:

  • To develop an integrated, low-cost system for measuring small displacements in IPMC actuators in aqueous environments.
  • To achieve high-resolution, real-time monitoring of actuator movement.
  • To implement robust fault detection for the IPMC system.

Main Methods:

  • A custom optical setup using a microscope, USB camera, and LED backlighting for high-contrast side-view imaging.
  • A predictive grid-based tracking algorithm combining edge detection, Harris corners, and geometric constraints for tip localization.
  • Dedicated electronic circuitry for monitoring supply and load conditions, detecting faults like over/undervoltage and short/open circuits.

Main Results:

  • The microscopy system provides spatial sampling of ~0.53 μm/pixel with minimal lens distortion.
  • The tracking algorithm achieves ~99% detection accuracy at 30 fps for actuation frequencies below 2 Hz.
  • The electronic circuitry successfully detected 100% of injected faults without spurious triggers during 3 hours of operation.

Conclusions:

  • The proposed system offers a compact, reproducible, and high-resolution alternative to laser-based or Digital Image Correlation techniques.
  • This framework is suitable for IPMC displacement characterization in submerged or challenging environments.
  • The technology can be extended to other micro-displacement sensing applications.