Contact-free measuring apparatus having an f-h- corrected...

Details Contact-free measuring apparatus having an f-h- corrected... Contact-free measuring apparatus having an f-h- corrected...

G - Physics

02

B

33/60

G02B 17/08 (2006.01)

Patent

CA 1266967

TITLE: CONTACT FREE MEASURING APPARATUS HAVING AN F- THETA-CORRECTED OBJECTIVE AND METHOD FOR USING THE SAME ABSTRACT OF THE DISCLOSURE An apparatus for the non-contacting measurement of rod shaped objects contains a telecentric, F-thetacorrected objective which comprises two catadioptric elements. The first catadioptric element is a Mangin mirror and the second catadioptric element is a plane plate mirror-coated at the front, while a third optical element is a meniscus lens . The use of catadioptric elements permits a simplified and inexpensive form of construction which is also compact, as a result of which objects with large dimensions can be measureed quickly and accurately. Such an apparatus serves, in particular, for the continuous control of the production of filament-shaped objects.

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