The Microflown, an acoustic particle velocity sensor

The Microflown is an acoustic sensor directly measuring particle velocity instead of sound pressure, which is usually measured by conventional microphones. Since its invention in 1994 it is mostly used for measurement purposes (broadband1D and 3D-sound intensity measurement and acoustic impedance). Possible applications are near and far field sound source localization, in situ acoustic impedance determination and a non contact method to measure structural vibrations (an alternative for a laser vibrometer). Although the Microflown was invented only some years ago, the device is worldwide commercially available, see further www.microflown.com