IMPROVED ACCURACY
THE ADVANTAGE OF PREDEFINED OBJECT INFORMATION
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Task |
All measurement systems have limitations with regard to
resolution and accuracy. But if a system is applied to a limited range of
applications the description of these limitations can be invoked as
predefined information. In general this greatly helps improve the data
quality beyond the basic capability of the measurement system itself, and is
the key to the success of many advanced measurement systems. In order to
fully explore the capability of a measurement system it is necessary to
understand and control this information. |
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Solution |
Conopticas optical measurement
systems contain simple solutions to the use of predefined (a priori)
information. A key idea
behind the Conoptica concept is that a measurement object Model
also governs measurement strategies. Some Models have been predefined from factory and other
important information can be recorded as an integral part of new Models. The
basic limitation of optical systems is the level of calibration, and the
limited spatial transversal (view) and longitudinal (depth) resolution. In
order to improve the measurement quality beyond these limitations the
Conoptica Models include advanced calibration schemes, and can be configured
to: avoid unresolved sharp view corners, average view data, average depth
data, compensate for unresolved depth geometry (Grazing Details), and
interpolate depth geometry. |
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Benefit |
Through this solution, where the measurement instructions are included
in the Model, advanced measurements can easily be performed efficiently and
consistently. Just by selecting the correct Model the operator has full
control of the predefined information to be used. Each Model has its unique
name. For example for round dies Conoptica delivers 3 predefined Models:
Drawing Die, Rough Drawing Die, and Cylindrical Drawing Die. Models of any
other complicated shape can be made and maintained. Note that as a
consequence different Models will result in different measurement results,
and that the better the Model is the better the accuracy will be! |
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Step by Step |
In order to control predefined information
you only need to select the correct Model. Properly created this model should
have taken the following into account: ·
The
region of interest is properly magnified to enable meaningful Calipers to be
made. ·
The
Caliper geometry is laid out to avoid problem areas, such as unresolved
corners, etc. ·
The
length of the Caliper segments are chosen to match the Parameters Of Interest
(POI). ·
The
Grazing Details are defined to reflect the shape, length, and material of the
area where the light is grazing tangential to the surface (in some
measurement panels also called the bearing or cylinder length). ·
The
depth data interpolations is (inscribed, parable, circumscribed) set
according to the expected depth geometry. |
