纹影法测量远场焦斑实验研究
Experimental investigation on focal spot measurement by schlieren method
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摘要: 报导了用纹影法测量远场焦斑的实验结果。远场焦斑经成像透镜放大成像后，由12bit，1 024×1 024面阵科学级CCD相机采集。将一定大小的小球放置在焦斑位置，用以遮挡光斑中心，控制CCD前的衰减可得旁瓣信息，将其与无遮挡光斑拼接，得到焦斑相对强度的完整分布。该方法扩展了焦斑光强测试的动态范围，可探测焦斑约4个量级的光能密度分布，提高了焦斑的测量精度。Abstract: The experimental results of focal spot measured with schlieren method were reported in this paper. The far field focal spot was enlarged by an imaging lens and collected by a scientific-grade CCD camera with 12 bit. Schlieren data were taken by shading the central lobe of focal spot with a certain size spherule and controlling the receiving attenuation. When the schlieren data were added to the central lobe data, the relative intensity profile of focal spot was achieved. The schlieren method can provide larger effective dynamic measurement range and improve the measurement precision of focal spot.
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Key words:
- schlieren method /
- far field /
- focal spot /
- main lobe /
- side lobe
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