Development of large-size high-speed phase shifting interferometer to observe sound and to measure turbulent thermal boundary layer

为了实现高灵敏度和高速测量，研制了一种新型的干涉测量系统。为了获得高采样率的相移数据，设计了一种新型的相移Koester棱镜。为了在风洞中搭建该干涉仪，利用凹面镜和三维准共光路，研制了大尺寸准共光路干涉仪，并对加热圆柱周围的强迫对流场进行了观测，利用触发线对边界层的湍流转捩进行了估算。最后，对平板上热边界层的发展进行了定量测量。此外，还估算了边界层中的速度分布。

In order to achieve highly sensitive and high-speed measurement, a novel interferometry system was developed. A novel phase-shifting Koester prism was developed to acquire the phase shifted data with high sampling rate. In order to build the interferometer in the wind tunnel, the large-size quasi common path interferometer was developed with the concave mirror and three dimensional quasi common path. Next, the forced convection field around heated cylinder was observed and the turbulent transition of the boundary layer was estimated by using the tripping wire. Finally, the developing of the thermal boundary layer on the flat plate was measured quantitatively. Furthermore, the velocity distribution in the boundary layer was estimated.