Velocity difference

In processes which involve the elongation of products, any desired velocity difference should be regulated accordingly. In other processes differences are undesirable since they can lead to backlogging or may even damage the product – due, for example, to the slippage of drive rollers or because tension is 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 the 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, simultaneously. The product being subjected to the measurement remains intact too. Using this optical measurement method avoids slippage, which improves control also during phases of run-up and delay, leading to higher yields in the end. 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.