薄透镜焦距测量方法的研究

Studies on the focal length measurement method for thin lens

传统的焦距测量方法由于人眼分辨率的局限性,光屏在一段区间内移动时,物像都很清晰,难以准确判物距,测量精度不高.对传统的测量方法进行改进,采用测微目镜做像屏,1/10mm分划板作为物体,利用消视差技术判断最佳成像的位置,提高了测量精度.

The traditional measurement methods for the focal length of thin lens are limited by the spatial resolution of human eye .When the screen moves within a certain range ,it is difficult to deter-mine accurately the position of the clearest image by naked eye ,and high accuracy cannot be achieved by such measurement .By using micrometer eyepiece as screen and 1/10 mm reticle as object , the measurement methods was improved by employing parallax elimination technique to achieve higher measurement accuracy with simple device .