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Interferometric measurement of aspheric form deviation in under 30 seconds

2019-01-09 | Products | Reilly, Karin
Complete phase map / surface deviation of an asphere
MarOpto TWI 60: Optimal for fast, reliable measurement of aspheric form deviation

During the production process of aspheres, form deviation must be checked continuously. Ideally suited for this task is the MarOpto TWI 60 Tilted Wave Interferometer from Mahr: it can measure different aspherical lenses with high precision and within seconds – without stitching or a CGH.

Asphere measurement in 30 seconds

The interferometer based on the Mach-Zehnder principle even measures very steep aspheres, and reliably detects medium and high-frequency errors on the surface at the same time. The entire lens is measured in a short sequence of interferometric images and takes about 30 seconds. The combination of the interferograms of all light sources depicts the entire aspheric surface. Since the MarOpto TWI 60 can test aspheres with a slope deviation of up to 8° (in terms of the best-fit sphere), the measuring system is particularly flexible and can be adapted to a wide variety of aspheres.

The advantages at a glance:

  • High measuring speed of approximately 30 seconds – even without stitching or CGH. The short measuring duration is key to ensuring form deviation testing during the ongoing production process.
  • Flexible in use, as even very steep aspheres can be reliably measured.
  • Highly precise measurement results minimize measurement uncertainty and increase the efficiency of your production.
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