自准直仪分为光学自准直仪和光电自准直仪，光电自准直仪是自准直仪和光电技术相结合的产物。
Autocollimator includes optical autocollimator and photoelectric autocollimator. The latter is the combination of optical autocollimator and photo-electricity technique.
CCD的分辨率是影响新型光电自准直仪测量精度的关键因素，而边缘检测法是CCD位移测量的主要方法。
The resolution of CCD is the key factor that impacts the measurement precision of new-type photoelectric autocollimator. Edge detection is the main method for CCD displacement measurement.
理论分析及实验表明，采用CCD为光电转换元件的光学自准直测角方法是可行的。
Principle analysis and experiment result indicate that the optical self-collimation Angle measurement method using CCD as photoelectric transformation element is feasible.
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