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当今,脉冲双曝光全息术已普遍应用于高速风洞流场参量的探测。它是在一张全息底片上记录流场处于两个瞬态的全息图。如果在两次曝光之间,参与记录的所有元件不发生相对位移,则再现干涉图将准确地反映其相对参量。但在风洞试验中,由于吹风时振动的强烈干扰,很难避免这些元件不受扰动,致使干涉图上掺进离散背景条纹而失真。
Today, pulse double exposure holography has been widely used in high-speed wind tunnel flow field parameter detection. It is a holographic film recorded in the flow field in two transient holograms. If there is no relative displacement between all the elements involved in the recording between exposures, the reproduction interferogram will accurately reflect its relative parameters. However, in the wind tunnel test, due to the strong interference of the vibration during the blowing, it is hard to avoid the undisturbed components and distort the interference pattern on the discrete background stripes.