Abstract: A novel focus-setting technique is elaborated in terms of its theoretical analysis and experimental results. Upon the new technology a high precision instrument for measuring curvature radius of polished concave spherical surface has been developed and its practical applications are discussed. According to the appraisal made by author-itative experts, the relative measuring error of curvature radius has been reduced to the magnitude of $Delta@R/R$LSEQ 1/100000. The present instrument is one of key measuring devices in developing high imaging quality and large size optical instruments in advanced science and technology. !3
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机译：摘要：从理论分析和实验结果两方面阐述了一种新颖的焦点设置技术。基于这种新技术，已经开发出了一种用于测量抛光凹球面曲率半径的高精度仪器，并讨论了其实际应用。根据权威专家的评估，曲率半径的相对测量误差已减小至$ Delta @ R / R $ LSEQ 1/100000的大小。本仪器是在先进科学技术中开发高成像质量和大尺寸光学仪器的关键测量装置之一。 ！3
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