Measuring free-form surfaces
PTB-News 2.2022
02.05.2022
While the interferometer’s tilt is measured by means of the autocollimating telescope (ACT), the interferometer determines the topography.
This interferometer’s tilt is detected while it is moved in a special guideway for measuring the surface under test. A large number of measurements performed using this procedure allows the topography of the surface to be determined – in particular of free-form surfaces that exhibit a strong curvature. A mirror element consisting of several partial mirrors considerably enhances the angular measuring range of the tilt for free-form surfaces without decreasing the accuracy of interferometric measurements. (Technology Offer 509)
Advantages
capable of measuring free-form surfaces
considerably enhanced measuring range
compatible with conventional autocollimators
Contact person for questions about technology transfer
Andreas Barthel, Phone: +49 531 592-8307, 
andreas.barthel(at)ptb.de, 
www.technologietransfer.ptb.de/en