German Aerospace Center, Institute of Propulsion Technology, Department of Engine Acoustics, Mueller-Breslau-Strasse 8, 10623 Berlin, Germany.
Opt Lett. 2012 Jul 1;37(13):2685-7. doi: 10.1364/OL.37.002685.
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.
瑞利散射是一种可用于确定各种技术或自然流动中密度分布的测量技术。本研究实验性地研究了瑞利散射技术的当前灵敏度极限。结果表明，有可能非侵入性地直接测量由声压波动引起的密度振荡。利用瑞利散射研究了矩形管道中的声驻波，并与麦克风测量进行了比较。结果表明，瑞利散射技术的灵敏度为 75 Pa（7·10(-4) kg/m(3))，精度为 14 Pa（1·10(-4) kg/m(3))。因此，还表明瑞利散射适用于声学测量。
