Autocollimator includes optical autocollimator and photoelectricautocollimator. The latter is the combination of optical autocollimator and photo-electricity technique.
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。
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The resolution of CCD is the key factor that impacts the measurement precision of new-type photoelectricautocollimator. Edge detection is the main method for CCD displacement measurement.