TWO-EXPOSURE HOLOGRAPHY FOR STUDY OF SHOCKWAVE FLOW GENERATED BY A MODEL IN A SUPERSONIC WIND CHANNEL
双曝光全息干涉法用于风洞中激波流场的研究

This article discusses the application of two-exposure holography to study shockwave flow.For irregular models,the numerical calculation of its shockwave flow is almost impossible, the experimentally quantitative measurement of the flow is particularly important. The paper successfully resolves the measurement problem of the shockwave flow generated by a certain irregular model in a supersonic wind channel,its finite-fringe hologram is obtained,by use of image processing technology,the hologram is skeletonized,and then fringe shift amount data are collected in man-computer fashion.Finally the density distribution of the flow is given through Laplacian transform method.