Non-contact length measurement

Determining the velocity provides the basis for measuring the length. The length is calculated based on the velocity profile while the measured object passes through the measuring location. A laser surface velocimeter (LSV) independently recognizes whether material is in the measuring location and can start/stop the length measurement accordingly. To achieve maximum measurement accuracy the LSV offers you the option of connecting light barriers as a means of starting or stopping the length measurement. This means you can link up several light barriers with one another logically in order to obtain a variety of application options. This may include, for example, controlling the length measurement using both trigger inputs, thereby increasing accuracy.

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 also remains intact. Another benefit of Polytec systems is the flexible interface concept – it enables length readings via encoder output, serial interfaces, LAN, Profibus and Profinet.

Measure cable length with laser precision

Polytec LSVs are used for a variety of length measurement processes in the cable and wire industry:

  • cut-to-length and winding of cables and wire
  • position sensing in printing and marking processes
  • winding coils
  • in wire drawing
  • in insulating and sheathing lines

Industrial length and speed control with optical sensors