The Tilted Wave Interferometer (MarOpto TWI 60) is a new and highly flexible interferometer for the quick and high precision measurement of aspheres.
The second picture shows the surface deviations measured in the A5 demonstrator asphere (free aperture 50 mm, best fit radius 40.8 mm, deviation from best-fit sphere 600 µm, gradient deviation 8°).
The lateral resolution is approx. 30 µm. During the data acquisition time of approximately 30 seconds, the entire surface of the asphere is measured at a high lateral resolution and with low measurement uncertainty. Most importantly, neither a CGH (Computer Generated Hologram) nor stitching is required.
