title: Optical measurement of acoustic pressure amplitudes-at the sensitivity limits of Rayleigh scattering.
abstract: Rayleigh scattering is a measurement technique applicable for the determination of density distributions in various technical or natural flows. The current sensitivity limits of the Rayleigh scattering technique were investigated experimentally. It is shown that it is possible to measure density oscillations caused by acoustic pressure oscillations noninvasively and directly. Acoustical standing waves in a rectangular duct were investigated using Rayleigh scattering and compared to microphone measurements. The comparison showed a sensitivity of the Rayleigh scattering technique of 75 Pa (7·10(-4) kg/m(3)) and a precision of 14 Pa (1·10(-4) kg/m(3)). Therefore, it was also shown that Rayleigh scattering is applicable for acoustic measurements.
authors: German Aerospace Center, Institute of Propulsion Technology, Department of Engine Acoustics, Mueller-Breslau-Strasse 8, 10623 Berlin, Germany. rausch_anne@web.de
authors: Anne
authors: A
authors: Rausch
authors: André
authors: A
authors: Fischer
authors: Nancy
authors: N
authors: Kings
authors: Friedrich
authors: F
authors: Bake
authors: Ingo
authors: I
authors: Roehle