Reducing the radiation influence of self-luminous object on schlieren imaging via spatial filtering

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• 作者：Yongxiang Zhu ; ^{zyxiang1979@hotmail.com" class="auth_mail" title="E-mail the corresponding author} ; Yongsheng Zhang ; Weiwei Xiao ; Yun Hu ; Dahui Wang ; Xueqing Zhao ; Xisheng Ye
• 关键词：Schlieren ; Self-luminous ; Spatial filtering ; Irradiance
• 刊名：Optik - International Journal for Light and Electron Optics
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：127
• 期：3
• 页码：1471-1473
• 全文大小：357 K

文摘

It is generally accepted that increasing the object distance can decrease the radiation influence of the self-luminous object in a schlieren system. This paper shows that a larger object distance results in a brighter image that exerts a greater influence on schlieren imaging because of overwhelming. To decrease the radiation influence, we propose to put the self-luminous object nearer to the second schlieren mirror, e.g. in the front focal plane, and spatially filter the radiation at the back focal plane of the second schlieren mirror by a diaphragm. An experiment was carried out, showing that the image irradiance contributed by self-luminescence can be reduced by several orders by this scheme.