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Sound as Pressure Waves01:17

Sound as Pressure Waves

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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
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Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
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Elastomeric Polymer Resonant Waveguide Grating based Pressure Sensor.

Fuchuan Song1, Antonio Jou Xie1, Sang-Woo Seo1

  • 1Department of Electrical Engineering, The City College of New York, 160 Convent Avenue, New York, NY 10031, USA.

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This study presents an elastomeric polymer resonant waveguide grating pressure sensor. It achieves high sensitivity by measuring optical resonance shifts, with potential for tunable pressure ranges and applications in optical imaging.

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Area of Science:

  • Photonics
  • Materials Science
  • Sensor Technology

Background:

  • Optical sensors offer non-intrusive measurement capabilities.
  • Resonant waveguide gratings are sensitive to structural changes.

Purpose of the Study:

  • To demonstrate an elastomeric polymer resonant waveguide grating as a pressure sensor.
  • To characterize its sensitivity and explore tuning capabilities.

Main Methods:

  • Fabrication of an elastomeric polymer resonant waveguide grating structure.
  • Measurement of optical resonance spectrum peak shift under applied pressure.
  • Finite element analysis for simulation and validation.

Main Results:

  • Achieved a sensor sensitivity of 86.74 pm/psi (12.58 pm/kPa).
  • Experimental and simulation results showed good agreement.
  • Identified grating period change as the primary response mechanism.

Conclusions:

  • The demonstrated sensor effectively measures surface pressure optically.
  • Sensitivity can be tuned via material properties and layer thicknesses.
  • Potential applications include optical ultrasound imaging and pressure mapping.