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应用楔形平板剪切干涉技术,根据非定焦状态下干涉条纹的取向变化确定待测焦距,具有装置简单、测量方便、精度高等优点,并可用于不可见光区的测量。
The application of wedge plate shear interference technology to determine the focal length to be measured according to the change of the orientation of the interference fringes in the unfocal state has the advantages of simple device, convenient measurement and high accuracy, and can be used for measuring in the invisible light region.