Free-form optical surface measuring apparatus and method

Details Free-form optical surface measuring apparatus and method Free-form optical surface measuring apparatus and method

2004-09-29

2009-02-17

Connolly, Patrick J (Department: 2877)

Optics: measuring and testing

By light interference

For dimensional measurement

C356S508000

Reexamination Certificate

active

07492468

ABSTRACT:
A surface measuring apparatus for measuring a surface shape of an element includes a measurement frame having a mount for mounting the element to be measured, a stage including a rotatable device, the stage being movable in at least a first direction relative to the measurement frame, and a contactless distance measurement device for measuring in the first direction a distance between the measurement frame and a predetermined measurement surface provided on the rotatable device. The apparatus further comprises a second distance measurement device for measuring in a second direction a second distance between the device and a selected position on a surface of an element mounted relative to the measurement frame and a rotation measurement device for measuring an angle of rotation between the first and second direction. In this way, aspheric or free-form surfaces of optical elements can be measured easily in closed loop without introducing abbel-errors.

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