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本文是对柴油机喷油雾场全息照像法的光学理论进行探讨,为测量、研究喷油雾场分布规律的激光全息术提供理论依据。就以下三方面作了较深入的研究: 1.把喷油雾场中的油滴视为透光的三维球体,推导出其全息图记录和再现的计算公式,较传统的,把雾滴视为不透光的薄盘或圆盘的数学模型更符合实际; 2.采用扩束富氏变换光学系统,为拍摄燃油雾场全息图时能记录下5μm以下的油滴找到了可靠的办法; 3.用夫朗和费狭缝衍射原理分析了实物标定法的失真度,找到了减少失真误差的方法。
In this paper, we discuss the optical theory of the diesel fog spray field holographic method, and provide the theoretical basis for measuring and studying the laser holography distribution of the spray fog field. The following three aspects of the more in-depth study: 1. The oil mist in the field of oil droplets as a three-dimensional transmission of light-sphere, derived its hologram recording and reproduction of the formula, the more traditional, The opaque thin plate or disc mathematical model more realistic; 2. The beam expander Fourier transform optical system, to capture the oil mist holographic map can be recorded below 5μm oil droplets found a reliable way; The distortion of physical calibration method is analyzed by the principle of Fraunhofer slit diffraction, and the method to reduce the distortion error is found.