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会聚光束热象扫描器的应用日渐增多。但会聚光束扫描器有两个固有的缺陷:(1)轴向离焦;(2)扫描非线性。适当地选取扫描器的回转中心和回转半径,扫描时的轴向离焦可以消除,此时,运转中心位于扫描反射镜中点法线上的某处,回转半径R=-2(2~(1/2)L。此处L指扫描反射镜到被扫象面的距离。消除轴向离焦后的扫描是非线性的。为克服此种非线性,物镜需设计成有特殊的畸变。利用一种f·θ透镜,使物镜满足
Convergent beam thermal imaging scanner applications are increasing. However, converging beam scanners have two inherent drawbacks: (1) axial defocus; (2) non-linear scanning. Appropriate to select the scanner’s center of rotation and the radius of gyration, the axial defocus can be eliminated during scanning, the operating center is located somewhere on the normal line of the scanning mirror, radius of gyration R = -2 (2 ~ ( 1/2) L, where L is the distance from the scanning mirror to the surface being scanned, and the scanning to eliminate the axial out-of-focus is nonlinear.In order to overcome such non-linearity, the objective lens should be designed to have special distortion. A f · θ lens that satisfies the objectives