asphericon Company

Measurement

For the measurement of aspheric components both tactile as well as interferometrical systems are used. Our equipment is compliant with the current world standard.

For the tactile measurements, a probe with a spherical ruby or diamond tip is moved across the surface on a cross-section trajectory. A laser-interferometric system is used to measure the amplitude of the probe from which the surface-irregularity of the object is being computed. Having devices with a resolution of 1.5 and 12nm we can measure surfaces with an accuracy of 100 to 200nmand an area of up to 250mm diameter.

Furthermore the equipment can be used to measure surface-roughness as low as 1nm. Our software allows to compute the errors either based on the trajectory or the X-plane.

High resolution measurement of an aspheric surface without CGH is possible using the Verifire™ Asphere. We are one of the few lens manufacturers who are able to measure aspheric shaped surfaces without CGH.