T (+31) (0)6 189 71 622 M info@ascee.nl

A new method for determining sound absorption, sound transmission, and sound power

Traditional acoustic measurements require assumptions about the sound source or the overall field. In this DAGA publication, the authors present the LPW method for separating incident and reflected sound in situ using a MEMS microphone array.

In-situ separation of incident and reflected sound

Researchers from the University of Twente and Soundinsight present a method for determining the in-situ absorption coefficient in arbitrary sound fields. The Local Plane Wave (LPW) method decomposes the local pressure and particle velocity into an incident and a reflected plane wave, allowing the incident power to be calculated directly without knowledge of the sound source. Extensions (LSPW and LAPW) correct for oblique incidence using an 8-channel MEMS array. Validation measurements on a car seat reveal local absorption differences at stitching seams. This forms the basis for the SonoCat spherical microphone (up to 10 kHz).

Citation for the publication

  • Authors: Ysbrand Wijnant (University of Twente / Soundinsight), Jen-Hsuan Ho (Soundinsight), Niels Consten (Soundinsight), and Anne de Jong (Soundinsight / ASCEE)

  • Publication: Proceedings of the 42nd Annual Conference on Acoustics (DAGA 2016)

  • Location & Date: Aachen, Germany (March 14–17, 2016)

  • Keywords: In-situ absorption, Local Plane Wave (LPW) method, intensity measurement, MEMS array, SonoCat

  • View the publication on the University of Twente Research Portal

  • Download the publication (PDF)

Related News

View everything

ACME v0.8 has been released!

ASCEE releases version 0.8 of the ACME acoustic measurement platform. This update speeds up analyses for the µZ system by up to three times by saving the Cross Power Spectrum in real time during the test. New features such as automatic signal processing and direct calibration to the DAQ streamline the daily workflow in the laboratory.

µZ System Update and Expansion of Capabilities

ASCEE is launching the new µZ-20 impedance tube for characterizing small meshes and vents for hearables. Without switching microphones, the system measures a wide range from 20 Hz to 8 kHz in a single measurement. This allows engineers to determine the series impedance of small components up to 4,000 MKS Rayls.

Validate your acoustic design choices with hard data

Without measurement data, acoustic product development remains a matter of guesswork. By calibrating numerical models with laboratory measurements, we make vibrations and noise predictable. This helps you avoid errors before the production phase. Discuss your design with us.

Contact UsSchedule a consultation