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目前，运用多传感器对工件和精密机床的直线度进行在线测量的方法有ＳＴＰ法、ＳＴＲＰ法和ＦＳＴＰ法等。由于受到传感器相邻间隔距离的限制，这些方法往往只适合于长工件的在线测量。本文推荐的新方法──优化误差分离法（ＯＥＳＴ）可以用于短工件中的测量，它是基于频域分析和时域优化搜索的原理，可以克服频域变换中出现的边缘失效问题以保证频域变换的正确性。本文还介绍了计算机仿真和实际测量实验的结果，并验证了该方法的可行性和正确性。
At present, there are STP method, STRP method and FSTP method for on-line measurement of the straightness of workpiece and precision machine tool by using multi-sensor. These methods are often only suitable for on-line measurement of long workpieces because of the distance between adjacent sensors. The new method proposed in this paper, OEST, can be used for short workpiece measurement. It is based on the principle of frequency domain analysis and time-domain optimization search. It can overcome the problem of edge failure in frequency domain transform to guarantee The correctness of frequency domain transformation. This paper also introduces the results of computer simulation and actual measurement experiment, and verifies the feasibility and correctness of this method.