Preview: 9th High Level Expert Meeting – Asphere Metrology on Joint Investigations

Specially manufactured aspheres such as these can be measured in the round-robin comparison. (Source: PTB)

Aspheres, i. e. surfaces of optical elements such as mirrors or lenses that are not spherically curved, pose special challenges for precision metrology due to their complex geometry. Since the requirements are also constantly increasing – for example in aspheres used in highly sensitive technical applications such as autonomous driving – it is no wonder that the interest of the experts in this event is very high: The annual meeting of experts High Level Expert Meeting Asphere Metrology has already been established internationally since 2010. And developers, manufacturers and users of aspheres from other countries are constantly coming in to find out about the latest measurement methods in this field. This year, the organizers of the Competence Center for Ultra-Precise Surface Treatment (CC UPOB), which is based at Germany’s National Metrology Institute “Physikalisch-Technische Bundesanstalt” PTB in Brunswick, are once again offering a round robin comparison. In addition, a Young Scientists’ Prize will be awarded for the first time. The registration deadline for the 9th High Level Expert Meeting – Asphere Metrology on Joint Investigations, which will take place from 28 February to 1 March at PTB’s premises, has been extended: Registrations are open until 19 February.

The event is a must in the respective industry – for years all leading manufacturers and users of aspherical technology, including the associated measuring technology, have been present. This year, a round robin comparison is scheduled to take place on a regular basis, in which all participants measure different types of aspheres in order to be able to objectively compare and compare the measurement methods and the measurement uncertainties achieved. This comparison is always anonymous. It is therefore not a question of assessing or classifying individual companies or their processes, but of advancing development in general. For the comparative measurements, the samples were selected from the large variety of standard lenses or specially prepared for this purpose. Three of these were to be measured by all participants in the inter-laboratory comparison between April 2017 and the end of October 2017, so that there was still time for careful evaluation. Four further samples make special demands on the measurement technology and can be measured up to the beginning of the event. They are used for testing whether and how the measurement methods can cope with the specific properties. The results are discussed at the meeting.

Young Scientist Award of the Competence Center Ultra Precision Surface Treatment (Source: CC UPOB)

With the 9th HLEM Asphere Metrology, new and particularly demanding lens geometries have been selected, such as particularly small, steep or cylindrical. In addition, the spectrum of topics will again be broadly diversified, matching the large and diverse market of aspheric and free-form optics. The organizers of the Competence Center for Ultra-Precise Surface Treatment want to present aspheric and free-form metrology to a larger circle of scientists, developers and manufacturers.

For the first time this year, a Young Scientist Award will be presented to support young scientists in ultra-precise surface treatment. Each candidate will present a short lecture and a poster; a jury of all participants will select the winners. The meeting will be held on the PTB premises. (Source: PTB)

Link: 9th High Level Expert Meeting – Asphere Metrology on Joint Investigations, Kompetenzzentrum Ultrapräzise Oberflächenbearbeitung (CC UPOB e.V.), c/o Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany

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