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论述了大型内球面直径在线测量的原理、测量系统的组成及误差修正方法。试验表明，该在线测量系统使用方便，测量精度能满足生产使用要求。
The principle of on-line measurement of large inner sphere diameter, the composition of measurement system and the error correction method are discussed. The test shows that the on-line measurement system is easy to use and the measurement accuracy can meet the production and use requirements.