A useful technique has been provided and developed for the researching and analyzing the factors and variation of flow field in the intake duct of diesel engine . to find out a new method to measure flow measurement , different intake duct on different conditions are experimented and researched by real - time holographic interferometry . real - time holography interferometry has many characteristics , such as high precision , non - destructive , high contrast of interference fringes and full field test 该方法具有精度高、非接触、条纹对比度好、对被测物体形状和表面无特殊要求的特点,实验了对三维非定常流动过程的可视化实时采集,为了解和分析不同流量、不同结构参数下进气道内气流运动状态和流动特性的变化关系及其影响因素提供了一种有效的测试手段。