PLu apex0 pages

Non-contact
metrology
for aspheric and
free-form optics

PLu apex is able to
measure any optical
surface from aspheric
to flat or free-form optics.
Its innovative design,
based on Sensofar’s core
technology, confocal
profilometry, allows
a non-contact and
high precision
measurement.

Confocal Tracking

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Non-contact metrology plays a key role in aspheric and
free-form optics manufacturing industries, either in mass
production or high precision applications.

Closed Loop Tracking
Optical
Linear
Scale

Confocal Sensorhead

The measurement principle is based on Sensofar’s
proprietary algorithm Confocal tracking. Using
structured illumination and high numerical
aperture microscope objective allows a very
precise determination of sample focus. Once
precise focus has been determined the sample
is moved along the horizontal axis while the
sensorhead executes a coordinate move along
the vertical axis to keep the sample in focus. The
sample profile is reconstructed by coupling the
movement of the horizontal and vertical axis.

Applications

High precision optics
Astronomical instrumentation
Optical data storage
Photolithography

LED

SLIT
CCD

Z

Drive

Objective
Sample

X

Drive

Measurement sequence

System diagram

1mm/s
Fast measurement across
the sample (1mm/s typical)

Automatic 0/90º
measurement

65º

Automatic lens center
finding tool

Ability to measure
up to 65º slope

Mass production optics
Blu-ray and DVD lenses
Cellphone and PDA camera lenses
Digital cameras and projector lenses

Software SensoTRACK
Powerful curve
analysis software

SensoTRACK software provides a user-friendly interface simplifying
sample measurement and a basic set of tools for displaying and
analyzing data. It also assists the user when aligning the sample for
measurement. A powerful aspheric analisys module provides form
assessment with respect to a design or a reference form.