in-line refraction profiling 纵测线折射剖面
When the offset distance is smaller on the wellhead, the layer velocity obtained with straight line and the refraction line is matched with that of actual formation velocity.
当井口偏移距较小时，直线法和折线法求取的层速度和地层真速度吻合；
Rapidly changing refraction due to turbulence along the line of sight affects different colors of light by different amounts and generally produces a twinkling effect for stars.
由于湍流而快速变化的折射在视线中会影响到光的不同颜色，这种影响也各不相同，一般会给恒星产生一种闪烁的效果。
Based on the analysis of present methods for atmospheric refraction correction, a new correction model is put forward based on the refraction Angle of the line of sight.
本文在分析现有水准折光改正方法的基础上，导出了一种基于水准视线折光角的改正模型。
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