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双曝光全息术用于水平圆管温度场的重建
Reconstruction of temperature field around horizontal cylinder based on double-exposure holography
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摘要: 双曝光全息术因可输出直观反映波面畸变的无限宽条纹而广泛应用于温度场的可视化。为了获取水平圆管周围的温度场,采用双曝光全息术记录了直径25mm、长350mm自然对流水平圆管壁温从72℃降至22℃的简单干涉条纹。采用条纹中心法提取不同周向角的条纹位移量,通过干涉图中R分量的峰、谷极值点来识别明、暗条纹中心,确定级数分布,最后反演温度场。壁面反演温度值与热电偶测量值的最大相对误差为0.059。结果表明,双曝光全息术获取的数据真实可靠。该项研究对简单快速反演温度场是有帮助的。Abstract: Double-exposure holography is widely adopted in temperature field visualization because of the output of infinite fringes which directly present the wavefront distortion. When the wall temperature of the natural convection horizontal cylinder in 25mm diameter and 350mm length dropped from 72℃ to 22℃, the simple interferometric fringes were obtained using the double-exposure holography to study temperature field. Stripe displacements at different angels were extracted by fringe center method. Peak values and valley values of R channel of interferogram were corresponding to the centers of bright and dark fringes. Distributions of fringe orders were achieved and temperature field was inversed. The maximum of relative error of wall temperature between inversion values and thermocouple measurement values was 0.059. The results show that the data of double-exposure holography is feasible and reliable. The study is helpful for simple and fast inversion of temperature field.
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