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Research activities


  • Transmission of Sound in Finite Surrounds
  • Sound Power Directivity
  • Sound Absorption Coefficient / Impedance evaluation
  • Room Property / Acoustic Evaluation

Current projects


  • Room Acoustic Criterion and Fault Assessment
  • Sound Intensity Measurement
  • The Transmission of Sound in Finite Surrounds

Facilities and equipment



In support of the research activities mentioned above, the Acoustic Laboratory has the following facilities and instrumentation:

  • A Reverberation Chamber of volume 15.4 cu.m (94 cu.ft) with wall absorption coefficients of 0.06 or less from 250 Hz. and upwards. The chamber acts as a source room for Random Sound Absorption Coefficient, Machinery Sound Power Assessment, and for Sound Transmission Loss.

  • An Hemi-Anechoic Chamber of 5.57 cu.m (34 cu.ft) dimension and 0.96 or better absorption, from 100 Hz. upwards. The chamber acts as a source room for machine directivity measurements, and as a reception room for Sound Transmission Loss Measurement via the Point to Point or Scanning Intensity Technique.

  • A series of Impedance Tubes ranging from 20 x 20 cm. cross section to 2.54 cm. diameter. These Tubes allow for Material Normal Absorption or Impedance Evaluation from 40 Hz. to 5 KHz. via the Transfer Function Technique. The tubes may also be employed for the Sound Transmission Assessment of small samples.

  • An Omni Directional Sound Source, employed for the Objective Evaluation of Room Acoustic Criterion

  • A series of instrumentation:
    • The Norsonics Analyzer Type 840, employed for the following:
      • Time Series evaluation of Transients or Cyclical Phenomena.
      • In situ Sound Power Assessment via the Intensity Technique.
      • Room Acoustic Assessment / Reverberation Time via the Impulse Response Technique.
      • Room Acoustic Directional Response via the Sound Intensity Technique.
      • Sound Intensity Mapping in situ or from Sound Transmission Loss Evaluation.
      • Discrete Frequency Analysis of Sound or Vibration via Fourier Transform
    • Additional Sound Intensity and Discrete Frequency Analyzer, capable of sound power evaluation and Cepstrum Analysis.
    • Numerous Sound Pressure Meters for standard sound assessment / statistical analysis for discrete, third octave, octave, and broad band assessment.
    • Transducers ranging from Sound Intensity Probes having pressure / zero intensity characteristics in excess of 20 dB, Directional and Diffuse
    • Microphones and a series of accelerometers and fixing conditions.

Research faculty

Joonhee Lee

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