These results suggested that although optical examination is low in cost and convenient, but it is restricted by its detection limit, which influences its results.

实验结果提示镜检虽然简便、易行、成本低，但由于一般观察极限的限制，影响了检出率。

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Optical computed tomography (OCT) is an important product of optical measuring technique and tomography. It is a new nondestructive examination technique with high accuracy.

光学CT技术是光学测量技术与层析技术相结合的重要产物，它是一项崭新的高精度无损检测技术。

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The USL unit forms part of an automated line for inspection of assembled printed circuit boards, which includes automated optical, thermal and X ray testing as well as ultrasonic C scan examination.

USL负责的单元是在线检测印刷线路板， 该系统包括光， 热， 及X射线检测， 同时还有超声C扫描检测。

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