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Optical Riblet Sensor: Beam Parameter Requirements for the Probing Laser Source.

Juliane Tschentscher1, Sven Hochheim2, Hauke Brüning3

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This study optimizes laser parameters for optical riblet sensors, ensuring high precision in geometric shape analysis. A low-cost laser pointer is validated for reliable, accurate riblet measurements.

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Area of Science:

  • Optics and Photonics
  • Metrology and Measurement Science
  • Materials Science and Engineering

Background:

  • Optical riblet sensors require high precision and reliability for geometric shape determination.
  • Existing methods may necessitate reference samples for accurate analysis.
  • The probing laser source's beam parameters are critical for sensor performance.

Purpose of the Study:

  • To investigate and define optimal beam parameters for a probing laser source in optical riblet sensors.
  • To establish mandatory requirements for sensor precision and reliability.
  • To develop novel methods for riblet shape analysis without reference samples.

Main Methods:

  • Detailed inspection of optical response using ray and wave optics.
  • Analysis of the impact of laser wavelength on sensor performance.
  • Derivation of new analytical measures for riblet geometry.

Main Results:

  • Mandatory requirements for minimum intensity and light polarization were determined.
  • Novel measures for analyzing riblet shape without a reference sample were derived.
  • Reference values for an ideal riblet structure were established.

Conclusions:

  • A frequency-doubled Nd:YVO₄ laser pointer can serve as a reliable, low-cost laser source for optical riblet sensors.
  • The study provides a framework for enhancing the precision and reliability of optical riblet sensing.
  • New analytical approaches enable accurate riblet characterization independent of reference standards.