Videos

Centration Measurement on Aspheres with Two Step Single 2SS Process on ACM

The Asphere Centration Measurement Instrument ACM uses the new Vignetting Field Stop VFS System to evaluate Centration error, slope error, and also Mid Spatial Frequency Errors (MSFE) on Aspheres. With a large field of view (FoV), large working distance (WD), and large depth of focus (DoF), this is the best instrument in the world. We show the Two Step Single 2SS version in this clip, which is used especially for single-sided Aspheres.

Straightness Measurement

Straightness measurement based on angle measurement reveals the highest accuracy with an uncertainty of less than 0.2 µm per meter in length. However, the limitation is that the entire rail must be measured with the mirror base. This leads to higher effort and more time, especially with long rails and workpieces. Our measurement system, ELWIGER, with the software evaluation ELWISoft GER works with a special algorithm so you can always prepare your workpiece and then measure only on the relevant regions to complete and evaluate the straightness measurement.

Centration Measurement on Achromats

Simple centration measurement on multi-surfaced and/or multi-lens optical systems with the ELWICenter software. This takes into account the refraction of the measuring beam on previous surfaces and calculates the effect via an integrated optical design program onto the following surfaces, so that the real tilt angles of each measured surface can be determined. This means an optical system can be measured completely in its assembled form. Ideally, the radii, lens thicknesses, air gaps, and refractive indices are known. The video demonstrates the measurement on a simple achromat with all three surfaces. Additional surfaces can also be measured. The design can be manually entered or imported from a database. Call us if you need this software and corresponding hardware or if you want a lens measured as a service – even in reverse engineering mode.

Double Centration Device for Rod Lenses

Optical quality control via centration measurement on rod lenses in endoscope production. The test specimens are measured and evaluated simultaneously from both sides with the double system. This allows the tolerances according to DIN ISO 10110-6 to be determined very quickly and precisely. The software GUI is extremely intuitive and easy to use with touch controls.

In-Situ Traverse NLP500 with ELWIMAT

After three years of research and development, the prototype of the In-Situ Deflectometric Acquisition of Optical Surfaces Measurement Technology (DaOS) has now been tested and evaluated on a flat test specimen. After each polishing step, in-situ measurements were conducted in the machine with the newly developed traverse with the Vignetting Field Stop Sensor ELWIMAT from Hofbauer. For referencing the measurements, all tests were also carried out on an SSI-A interferometer in the measurement room of TC-Teisnach. Result: Accuracy smaller than 60 nm PV and less than 20 nm rms. Particularly, long-wavelength deviations are very reliably evaluated and corrected in the next polishing step.

Measurement on Aspheres

Measurement on Aspheres by VFS-Technology – Aspheric Centration Measurement Machine ACMM Demonstrator

Kitten on Mandrel – Lens Mounting on HD Mandrel

The video shows the mounting (blocking) of a workpiece during asphere manufacturing onto an HD mandrel with an accuracy of less than 10 arc-seconds.

Multi-Surface Centration Measurement on Optical Systems

Open centration software for centration measurement on complete optical systems according to DIN ISO 10110. The optical design software for calculating the centration errors of all surfaces following the first surface is included. Design data for radius, refractive index, thickness, and lens distance are entered before measurement either manually or with, for example, a barcode scanner. Results are displayed in tables and graphs and saved as a PDF report and securely in CSV format. Well-suited for retrofitting existing centration measuring devices. www.hofbauer-optik.de Royalty-free music by Frametraxx.

Straightness ELWI-GER 3000 HD

Straightness measurement on a granite beam with micrometer accuracy