相对方差 meaning in Chinese

relative variance

In this paper the injection dispersion in an oscillatory flow mixer has been studied by using the flow visualization technique with a solution of blue dye as the tracer . the process of injection dispersion was monitored with a digital camera connecting to a computer that treated the video data stream synchronously to obtain the attenuation curve of relative deviation of the flow image ' s gray scale values
实验采用以蓝色有机染料为示踪剂的流动显形技术，由摄像头实时摄取注入分散过程的动态图像，计算机同步分析视频流数据，从而以在线监测的方式获得流场图像的灰度相对方差随时间衰减的曲线。