从理论上研究部分相干光被一环形透镜聚焦，在焦点附近的轴上点的光强分布。
The on-axis intensity distribution was investigated in the focal region of partially coherent light focused by an annular lens.
被检测的热释电红外信号经过滤光镜片和摆动的凸透镜聚焦后，其红外光焦点同样也进行微幅摆动。
The detected pyroelectric infrared signal passes through an optical filter and is focused by the swinging convex lens and the infrared focus is also swinging slightly.
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