Which of the following is a non-contacting optical method of on-line d

1.	Which of the following is a non-contacting optical method of on-line diameter measurement?
A.	Brussels‚Äö√Ñ√∂‚àö√ë‚àö¬•s method
B.	Velocity differentiator method
C.	Photo detector method
D.	Image projection method
Answer» E.

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Which of the following is a non-contacting optical method of on-line diameter measurement?
What is the minimum value of accuracy in diameter is needed to avoid radiation losses in the fiber?
During the fiber drawing process, the fiber outer diameter is maintained constant to within ________

Which of the following is a non-contacting optical method of on-line diameter measurement?

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