acoustical field characterization

Fully automated acoustical field characterization system for measuring directivity and sound pressure levels in a semi-anechoic chamber.

The goal of this project was to characterize the acoustic field of a developed sound source, validate theoretical models by direct comparison with experimental measurements, and ensure stable and reproducible data acquisition through automated control.

Experimental setup in semi-anechoic chamber with measurement microphone, linear and rotational stages, and spectrum analyzer
Experimental setup in a semi-anechoic chamber, including a measurement microphone, linear and rotational stages, and a spectrum analyzer.

A MATLAB-based automated measurement program was developed, which profiled and applied instrument settings via vendor-specific command sets over GPIB, ensuring consistent and reproducible measurement conditions. The spectrum analyzer, power amplifier, and the linear and rotational stages were driven from this single program, so that once the setup had been aligned a full propagation or directivity sweep ran to completion unattended: no operator action between measurement points, and therefore no run-to-run operator variability in the acquired field. The system was capable of characterizing frequency response, propagation curves, and beam patterns.

Simulated sound pressure propagation curve of the developed sound source
Experimentally measured sound pressure propagation curve
Simulated acoustic beam pattern showing directivity
Experimentally measured acoustic beam pattern
Measurement results: propagation curves and beam patterns of the developed sound source.

The experimental data obtained from this measurement system provided direct validation of theoretical models and contributed to the following publications(Park† et al., 2024; Kim† et al., 2025; Kim et al., 2025).

Related works

2025

  1. Appl. Acoust.
    An Accurate Measurement of Parametric Array Using a Spurious Sound Filter Topologically Equivalent to a Half-Wavelength Resonator
    An Accurate Measurement of Parametric Array Using a Spurious Sound Filter Topologically Equivalent to a Half-Wavelength Resonator
    Woongji Kim†, Beomseok Oh†, Junsuk Rho*, and Wonkyu Moon*
    Applied Acoustics, Dec 2025
    DOI Related
    Project
  2. J. Acoust. Soc. Am.
    Design, Analysis, and Experimental Validation of a Stepped Plate Parametric Array Loudspeaker
    Design, Analysis, and Experimental Validation of a Stepped Plate Parametric Array Loudspeaker
    Woongji Kim, Beomseok Oh, Chayeong Kim, and Wonkyu Moon*
    The Journal of the Acoustical Society of America, Sep 2025
    DOI Related
    Project

2024

  1. Small
    Interactive Deformable Colored Sound Display Achieved with Electrostrictive Fluoropolymer and Halide Perovskite
    Interactive Deformable Colored Sound Display Achieved with Electrostrictive Fluoropolymer and Halide Perovskite
    Doowon Park†, Woongji Kim†, Chaeyong Park, Jun Choi, Arup Ghorai, Gilwoon Lee, Seungmoon Choi, Wonkyu Moon*, and Unyong Jeong*
    Small, Sep 2024
    DOI

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