Besides, in most cases the overlong distance from knife edge to the aspheric surface to be tested will decrease the precision of the knife-edge testing.

此外，在很多情况下，刀口到待检非球面的距离很长，从而降低了刀口检验精度。

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Comparing with the testing results of interferometer, the digital knife-edge testing technology is available and can provide theoretical basis for surface modification.

通过与干涉仪测量结果相比较，验证了数字刀口检测方法的可行性，为镜面误差的加工修正提供了依据。

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