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大气折射率的测量直接影响激光测长精度。本文以Ｅｄｌｅｎ公式为基础，提出了新的以相对湿度为参量的大气折射率计算公式。经误差分析，新公式不确定度为±５×１０－８。
Atmospheric refractive index measurement directly affects the accuracy of laser length measurement. Based on the Edlen formula, this paper proposes a new atmospheric refractive index formula based on relative humidity. The error of the new formula is ± 5 × 10-8.