Solartron Metrology
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Applications Resource Centre Contact Solartron Metrology
Knowledge Base
Understanding Non Repeat
Measuring Moving Material
Synchronising Linear and Rotary Measurements
LVDT, Half Bridge, and Digital Transducer Theory
Optical Technology Theory
Glossary of Terms
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Measuring moving material


Non Contact measuring systems, such as Laser, are commonly used for measuring moving material
and they are often effective. However, they are not always practical, cost effective or even
possible to use in certain applications and contact methods may need to be considered.
As with non contact systems, contact systems need careful consideration before choosing the
best product for the job. The speed of the material moving below the tip and surface finish
have a significant effect on the life of the transducer.

Resting a ball tip on moving material may work well for short distances but it is not really suitable for continual use. Side loads may attempt to rotate the bearing, affecting accuracy and shorten the life of the probe

Wheel tips are commonly used in measuring moving material.
They are suitable for medium accuracy applications (<+/- 1.0um).
The roundness of the wheel and wear on the wheel bearing affect accuracy and these errors should be added to the accuracy of the transducer.

Wheel Tips

Flexures probably have the best overall performance for contact measurement of moving material.

Linear forces through the flexure and no sliding components within the flexure help to ensure excellent performance and a very long life.



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