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简要介绍白炽灯点燃过程中灯内气体折射率三维分布测量的实时全息干涉图像,根据密闭气体被灯丝加热时所涉及的物理问题建立简化的物理及数学模型,并利用数字图像处理技术对全息干涉图像的形成过程进行模拟研究。研究结果表明,当灯泡外空间的折射率变化不均匀时,灯泡投影区域内的干涉图像将同时带有灯内外气体折射率变化的信息,利用干涉图像中灯泡投影区域外干涉条纹的测量结果可以对实际测量结果进行修正。此外,根据研究结果及全息CT技术,给出了忽略灯泡外空间的折射率变化影响时白炽灯内气体折射率三维分布测量的实例。
This paper briefly introduces the real-time holographic interferometric image of three-dimensional distribution of gas refractive index in the incandescent light. Based on the physical problems involved in the closed gas heated by the filament, a simplified physical and mathematical model is established and the digital image processing technology is used to measure the holographic interference Image formation process simulation study. The results show that when the index of refraction in the outer space of the bulb is not uniform, the interference image in the projected area of the bulb will have the information of the index of refraction of the gas both inside and outside the lamp. Using the measurement results of the interference fringes outside the projected area of the bulb in the interference image, The actual measurement results are amended. In addition, according to the research results and the holographic CT technique, an example of measuring the three-dimensional distribution of gas refractive index in an incandescent lamp when ignoring the influence of the refractive index change in the outer space of the bulb is given.