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在检验中产生直线Ronchi条纹的Ronchi检验称为零点Ronchi法。文章介绍了这种方法的应用,即使用特殊格线检验抛物面凹镜。首先介绍了一种近似方法,即用一条抛物线代表特制的格线。然后介绍精确方法,即通过计算抛物面镜的横向象差来确定这种特殊的格线。业巳证明:检验小相对孔径凹面镜时,可以使用适似方法,但检验大相对孔径反射镜(例如f/4或更大的反射镜)需用精确方法。结论:这种检验方法与普通的Ronchi法相比较,从性能上说是灵敏的。
The Ronchi test that produces linear Ronchi streaks in the test is called the zero-point Ronchi method. The article describes the application of this method, which uses special grid inspection parabolic concave mirror. First of all, we introduce an approximate method of using a parabola to represent a special grid. Then introduce the precise method of determining this particular grid by calculating the lateral aberrations of the parabolic mirror. It has been proven that a similar approach can be used when testing small relative aperture concave mirrors, but accurate methods are required to verify large relative aperture mirrors (eg f / 4 or larger mirrors). Conclusion: This test method is more performance-sensitive than the normal Ronchi method.