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MarForm MFU 200 Aspheric 3D

Precision 3D Measuring Station

DESCRIPTION

Mahr developed the MarForm MFU 200 Aspheric 3D to enable optical
components to be tested in 2D / 3D quickly and close to the production
area. MarForm measuring machines have been recognized for decades for
their accuracy and stability.
With the MarForm MFU 200 Aspheric 3D, this experience has now
become available to the optical industry.
Accuracy
• The MarForm MFU 200 Aspheric 3D is a precision measuring
instrument. Its very low measurement uncertainty is ideally suited to
your process optimization requirements.

Measuring principle
• The MarForm MFU 200 Aspheric 3D measures the topography of
optical components. Of course, a quick 2D measurement can also
be recorded with a profile across the zenith of the lens. For 3D
measurements, two linear profiles offset by 90° are first measured
across the zenith of the lens in a single sequence. Then, multiple
concentric polar profiles are recorded by rotating the C axis. These
measuring points are used to generate a topography. Interrupted sur-
faces can be measured with the fully positionable probe arm.
• Using the measuring station in a vibration-cushioned cabinet keeps
external interference, such as vibration and dirt, away from the
measuring objects. MarWin is the software used for operation and
analysis.
Measuring procedure
• Before starting the measurement, choose the nominal form type and set
the parameters for the expected reference lens. In the next step, the
measuring data is recorded and compared with the nominal data for
the lens.
• The RMS value, PV value and slope error are shown as parameters.
• In the software, the individual parameters for the aspheres, such as the
radius of curvature R0, conical constant k and the aspheric coefficients
Ai, can be adjusted to the measuring results when adjusting the
nominal asphere to the fit asphere.
• The differential topography between the measured values and the
nominal lens is displayed as a color coded line chart. The 2D profiles and
the differential topography can then be exported in known formats for
correction for the machine tool.
• In addition to measuring spheres and aspheres as described above,
other rotationally symmetrical objects can also be measured and
evaluated using the nominal form as a conical profile or Sagitta
description of a 3D scatter plot.

3D visualization of target/actual comparison

For more information, please visit our website: www.mahr.com

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