内法线是法线中的一种，一般有内法线和外法线之分，是数学几何类概念。
为保障航空发动机的可靠性，要求精确测量发动机叶片不同界面处的内、外表面法线方向的厚度。
Precision measurement of blade wall thickness along the common normal of inner and exterior surfaces is required to guarantee the reliability of air engine.
结果在所测定urea、CREA中，预期偏倚在方法线性范围内均可以被接受。
Results Among these testing results of UREA and CREA, the anticipated bias was acceptable within methodological linear limitation.
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