Optical metrology

In deflectometry, a camera images fringe patterns that have reflected off a surface under test, so that a system can deduce a map of the surface slopes from the deviation of the projected fringes, and from that determine the surface shape. Credit: Mahr

Getting the measure of aspheric and freeform lenses

Lens features have been getting too small to properly characterise – but metrology providers are catching up, finds Andy Extance

Optical Metrology for Large Space and Terrestrial Telescope Optics

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Measurement of large optics require metrology systems that can function despite vibration, turbulence and other challenges.Laser interferometry is used throughout the manufacturing of large optics to ensure conformance to demanding design specificationsMore recently, “dynamic interferometry” has been implemented for vibration-insensitive measurement of large optics.

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