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Scattering And Absorption of Light in Planetary Regoliths
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Converting Sabine absorption coefficients to random incidence absorption coefficients.

Cheol-Ho Jeong1

  • 1Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark, DK-2800, Kongens Lyngby, Denmark. chj@elektro.dtu.dk

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PubMed
Summary

This study proposes methods to convert Sabine absorption coefficients to random incidence absorption coefficients, addressing overestimations from chamber measurements. Optimizations for porous absorbers improve accuracy, though Miki

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Area of Science:

  • Acoustics
  • Materials Science

Background:

  • Sabine absorption coefficients, measured via chamber methods, can exceed unity due to experimental limitations like finite sample size and non-uniform sound intensity.
  • Accurate determination of random incidence absorption coefficients is crucial for predicting material performance in real-world acoustic environments.

Purpose of the Study:

  • To develop and validate conversion methods for transforming Sabine absorption coefficients into random incidence absorption coefficients.
  • To investigate the theoretical basis for overestimation in Sabine coefficients using Miki's model for porous absorbers.
  • To propose and evaluate optimization techniques for surface impedance, flow resistivity, and flow resistance.

Main Methods:

  • Theoretical investigation of Sabine coefficient overestimation using Miki's model for porous absorbers backed by rigid walls or air cavities.
  • Development of conversion factors based on theoretical models.
  • Validation of conversion methods using four types of porous absorbers, with optimizations applied to surface impedance, flow resistivity, and flow resistance.

Main Results:

  • Optimization of surface impedance yielded the best results for absorbers backed by rigid walls.
  • Flow resistivity optimization provided reasonable results for absorbers backed by rigid walls and proved successful for extendedly reacting absorbers.
  • Theoretical conversion factors from Miki's model showed limitations, particularly at low (<250 Hz) and high (>2500 Hz) frequencies.

Conclusions:

  • Proposed conversion methods and optimizations effectively improve the accuracy of random incidence absorption coefficient estimations from Sabine measurements.
  • Surface impedance optimization is recommended for rigid-backed absorbers, while flow resistivity and flow resistance optimizations are effective for extendedly reacting absorbers.
  • The reliability of theoretical conversion factors is frequency-dependent and requires careful consideration, especially outside the mid-frequency range.