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针对长焦距测量中被测透镜像差引入的焦距测量误差提出了一种校正方法。传统长焦距测量中使用高斯公式来计算被测透镜的焦距值,未考虑被测透镜像差引入的误差。在采用发散光作为测量光束的大口径光学元件焦距测量中,该误差成为了影响测量精度的重要因素。详细分析了基于发散光和泰伯效应的长焦距测量法,利用数值方法获得了误差修正值,并与Zemax的仿真结果进行了对比。利用Visual C++编程,实现了测量结果的自动校正功能。对名义焦距值为13500mm和31251mm透镜的测量数据分别进行校正后,其相对于名义焦距值的测量精度分别优于0.007%和0.022%。将校正后的测量精度与干涉仪法的测量精度进行了对比,结果充分说明了该方法是可靠和有效的。
Aiming at the measurement error of the focal length introduced by the aberration of the measured lens in the measurement of long focal length, a correction method is proposed. Conventional long focal length measurement Gaussian formula used to calculate the measured lens focal length value, did not consider the error introduced by the measured lens aberration. In the measurement of the focal length of a large-diameter optical element using divergent light as a measuring beam, this error becomes an important factor affecting the measurement accuracy. The long focal length measurement based on the divergent light and the Talbot effect is analyzed in detail. The error correction value is obtained by the numerical method and compared with the Zemax simulation results. Using Visual C + + programming, to achieve the automatic calibration of measurement results. When the measurement data of the nominal focal length of 13500mm and 31251mm lens are respectively corrected, the measuring accuracy with respect to the nominal focal length value is better than 0.007% and 0.022% respectively. The corrected measurement accuracy is compared with the measurement accuracy of the interferometer method. The results fully demonstrate that the method is reliable and effective.