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在人口马赫数M_1=0.4、雷诺数Re_b=7×10~5来流条件下的激波风洞中，用激光差分干涉仪获得了跨声速涡轮平面叶栅流场干涉图，利用叶栅流场的周期性条件，给出相应的密度场定量结果。并与用S_1流面流函数矩阵解的计算结果做了比较，规律基本一致。
In the laser wind tunnel with a Mach number of M_1 = 0.4 and a Reynolds number of Re_b = 7 × 10 ~ 5, the laser interferometer was used to obtain the interferogram of the cascade flow field in the transonic turbo plane. The periodic conditions of the field give the corresponding quantitative results of the density field. The results are compared with those obtained by using S_1 stream surface flow function matrix. The laws are basically the same.