Fraunhofer project MIAME

Laser light for 3D measurements on a meter scale with accuracies in the sub-micrometer range

Goal of the project

The MIAME project aims to develop the world’s first optical coordinate measuring machine that can quickly conduct full-surface measurements of large complex objects (meter scale) with interferometric (sub-micrometer) accuracy. The core component is a novel light source based on so-called whispering gallery resonators that enable controlled detuning of the emitted wavelength in the range of several hundred GHz. This allows for a self-configuring digital-holographic sensor system, which – when operated in a multi-axis handling system (e.g. a 5-axis machining center, see figure) – can detect up to 500 million 3D points per second. The goal is to achieve single point accuracy of better than 0.1 µm and an unambiguity range of up to 1000 mm.

Laser light source based on whispering gallery resonators
A laser light source which is not currently available on the market will be developed as part of the project and will form the core of the digital-holographic coordinate measurement system. The light source must be able to be switched quickly and precisely between different wavelengths. The interference patterns at these individual wavelengths are recorded and compared. The unambiguity range can calculated using the synthetic wavelengths, which become greater the closer together the real laser wavelengths are. The project involves the development of a laser light source based on whispering gallery resonators. This work will draw on research conducted as part of the Professorship for Optical Systems at the University of Freiburg, which has close ties to Fraunhofer IPM.

 


 

Holographic sensor system HoloCut

Optical 3D sensors HoloCut + HoloPort for complete quality control
© Fraunhofer IPM
Holographic sensor systems such as HoloCut are already capable of performing precise interferometric measurements within sophisticated multi-axis systems (e.g. machine tools). The developments of the MIAME project make interferometric absolute measurements possible for the first time – the missing piece of the puzzle for optical coordinate measuring machines.

Project financing

The MIAME project is financed by the Fraunhofer-Gesellschaft as part of the PREPARE program.

Project partners

  • Fraunhofer IPM (project coordination))
  • Fraunhofer IAF

Project duration

April 1, 2020–March 31, 2023

 

Expertise

Digital Holography

Fraunhofer IPM has been conducting research in the field of multiwavelength digital holography for many years.

 

Application

Digital holography in
industrial quality assurance