Combined top & bottom topography in a single shot

Functionality and quality of industrially manufactured components relies on well-controlled and well-monitored machining processes. Quality control, close to line or inline quality inspection often uses surface metrology for evaluating form, roughness and other surface parameters. Sometimes, the combined look on front and back sides of a workpiece is indispensable for a comprehensive quality analysis.

Now, Polytec enhances the perspective for valid measurement results, providing a combined top & bottom topography in a single, but areal and direct measurement. 

Top + bottom topography needed?

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Combined top and bottom measurement

FTP Flatness Thickness Parallelism concept: combined (areal) measurement in a single shot
FTP Flatness Thickness Parallelism concept: combined (areal) measurement in a single shot
Capture parallelism and thickness of a sample, while also evaluating flatnesss of both back and front side of a surface
Capture parallelism and thickness of a sample, while also evaluating flatnesss of both back and front side of a surface
Capture parallelism and thickness of a sample, while also evaluating flatnesss of both back and front side of a surface
Capture parallelism and thickness of a sample, while also evaluating flatnesss of both back and front side of a surface
FTP Flatness Thickness Parallelism concept: combined (areal) measurement in a single shot
FTP Flatness Thickness Parallelism concept: combined (areal) measurement in a single shot
Capture parallelism and thickness of a sample, while also evaluating flatnesss of both back and front side of a surface
Capture parallelism and thickness of a sample, while also evaluating flatnesss of both back and front side of a surface
Capture parallelism and thickness of a sample, while also evaluating flatnesss of both back and front side of a surface
Capture parallelism and thickness of a sample, while also evaluating flatnesss of both back and front side of a surface

Sometimes, the combined look on front and back sides of a workpiece is indispensable for a comprehensive quality analysis. This might require swapping or flipping the sample, or using an additional reference surface as indirect measurement, or applying two sensors each from one side. Each approach can lead to additional measurement uncertainty. 

The new Polytec FTP Flatness, Thickness and Parallelism measuring module represents the fast and comprehensive measurement solution for evaluating flatness, thickness and parallelism at once. The FTP measuring module for back and front measurements can become a game-changer in quality control of precision mechanics such as in the watch-making industry, for sealing surfaces, shim rings or optical components and more. 

Flipping or swapping the sample for A + B topography characterization
Flipping or swapping the sample for A + B topography characterization

Flipping or swapping the sample

In some cases front and back sides can be measured by flipping the sample. This is mostly realized by a rotational unit and requires a complex alignment procedure. The FTP concept of Polytec measures without need of rotation, nor flipping, thus avoiding additional sample alignment for a faster and more simple operation.

 

We provide flatness, thickness, parallelism in a single shot

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Indirect measurement using an (imperfect) reference surface for flatness, thickness and parallelism measurement
Indirect measurement using an (imperfect) reference surface for flatness, thickness and parallelism measurement

Indirect vs direct measurements

Indirect measurements use a reference surface to characterize the backside of a sample due to lack of access to the original sample surface. These standard procedures often lead to time-consuming sequential measurements of a workpiece. Plus, the results base on the assumption of the reference surface being perfect. 

FTP Flatness Thickness Parallelism point or line vs areal measurement (coherence scanning interferometry)
Point or line profile reveal limited insights compared to areal measurement using coherence scanning interferometry

Data density depending on line vs areal profiling

Common single-point or line-profile based evaluations can only gather a limited measurement points of the true 3D (areal) surface. This results in time-consuming procedures along with the sacrifice of either higher point density or throughput. Here, the Polytec FTP combined measurement approach provides a non-contact, high data density or areal measurements from both top and bottom view in a single measurement.

Further applications