Acoustics and Vibrations

auv_39 The Acoustics & Vibrations  Laboratory, is responsible for maintaining, realizing and disseminating the national standards of sound pressure Pa and acceleration m/s2. It consists of two sections: a) the primary acoustics laboratory, responsible for the calibration of microphones, sound level meters, sound calibrators, pistonphones and b) the primary vibration laboratory, responsible for the calibration of accelerometers with LASER interferometry as well as with comparison methods. In addition the laboratory is equipped with a fully anechoic chamber built in accordance with the ISO 3745 standard (measurements and calibrations in free field for the determination of sound power and pressure).

The Acoustics & Vibrations Laboratory performs measurements and calibrations of:

  • laboratory standard microphones using the “reciprocity technique”
  • microphones by comparison with reference microphones or by the “electrostatic actuator technique”
  • sound calibrators and piston phones by the “Insert voltage technique” and by comparison using calibrated piston phones
  • sound level meter calibration according to EN IEC 61672-3 standard
  • accelerometers by comparison with reference accelerometers, which are calibrated by laser interferometry and vibration frequency measurements, providing traceability to the wavelength and the electrical standards of EIM.
  • sound pressure level (dB SPL re 20 μPa) in free field, at the fully anechoic chamber with dimensions 4.75 m x 4.75 m x 3.68 m.

Indicative measurements and calibrations

Measurement of low frequency sound sources at the anechoic chamber of the Acoustics & Vibrations Laboratory (Measurement of Compound Sound Sources with Adaptive Spatial Radiation for Low-Frequency Active Noise Control Applications).

Measurement of low frequency loudspeakers at the anechoic chamber of the Acoustics & Vibrations Laboratory (Design and construction of loudspeakers with low-Bl drivers for low-frequency active noise control applications).