High-precision detection of velocity differences

Any required velocity difference should be regulated accordingly in processes which involve the elongation of products. In other processes differences are undesirable since they can lead to backlogging or even damage to the product – due, for example, to the slippage of drive rollers or to tension generated in the product. The velocity difference is calculated by measuring the velocity at different points in the process and comparing the readings with one another. Using several laser surface velocimeters (LSV) allows you to accurately determine the velocity at relevant points in the process, thereby enabling you to optimize it.

LSVs from Polytec are ideally suited because they can conduct measurements on almost any surface and they are not susceptible to contaminated surfaces. The non-contact measuring technique makes it possible to eliminate any negative influences on accuracy, such as slippage and wear, in one go. The product being subjected to the measurement remains unaffected. The increased accuracy of velocity measurement allows you to monitor the velocity difference more closely. As a result you are better able to adhere to the end product requirements. The result: You increase quality while at the same time reducing waste.

Practical examples

Polytec LSVs are used for a variety of velocity difference measurements in the converting and textile industry:

  • synchronization of individual sheets in longitudinal cutting processes
  • synchronization of roll and sheet in winding and unwinding processes
  • tension monitoring

Industrial length and speed control with optical sensors