非准确联合变换相关测量透镜焦距

提出了一种利用非准确联合变换相关测量透镜焦距的方法.该方法首先利用已知焦距透镜记录联合功率谱,再用记录的联合功率谱经被测焦距透镜输出相关点,记录相关点并测出其间距,可以计算出被测透镜的焦距.理论分析和实验结果表明,该方法有较高的测量准确度,能实现透镜焦距的自动测量.

Measurement of Focal Length of Lens Using Inaccurate Joint Transform Correlative Technique

A focal length measurement method using inaccurate joint transform correlation technique is proposed.The joint power spectrum is recorded using lens of known focal length,and correlation spots are output by the lens to be measured.The correlation spots are recorded ,correlation spot interval is measured,and focal length can be calculated.The results show that the measurement precision is higher and the method can be potentially applied to focal length measurement automation.