Length measurement on roll-fed material and piece goods
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. LSV Laser Surface Velocimeter are laser-based length and speed sensors, that automatically recognize 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 to obtain a variety of application options. This may include, for example, controlling the length measurement using both trigger inputs, thereby increasing accuracy.
LSV Laser Surface Velocimeters are the ideal metrology in manufacturing because they measure on almost any surface and still work with contaminated surfaces in production lines. The non-contact measuring principle avoids inaccurate measurements caused by slippage and wear. The produced good remains intact thanks to the non-invasive method. Another benefit of Polytec systems is the flexible interface concept – it enables length readings via encoder output, serial interfaces, LAN, Profibus and Profinet.
Length measurement and control
Polytec LSVs are used for a variety of length measurement processes in the metal industry:
- length verification of cut products such as rods, tubes, coils, panels and sheets
- plate positioning in U- and O-presses for longitudinally-welded large-diameter tubes
- cut length control of flying or vertical saws and shears
- material tracking for sheet materials
Rotary tube saw control
These are increasingly being used in tube rolling mills. The saw blade is moved around a circular course at the speed of the tube. The movements must be exactly synchronized and that with speeds of up to 10 m/s. The Polytec LSV measures tube speed without slippage or wear to control the rotary tube saw. Using the LSV allows for an exactly vertical cut and reduces the length tolerances to a minimum.
Optical length and speed measurement in steel, aluminum and metals production
Related products
ProSpeed LSV-2100 Laser Surface Velocimeter
The ProSpeed® LSV-2100 optical sensor determines the direction of motion and standstill conditions with laser precision. It measures reliably even under harsh production conditions with large working distances up to 3 m. Due to the non-contact measurement principle, these laser sensors eliminate common problems of traditional contact-wheel measurement methods such as damage to delicate surfaces, slippage and thermal expansion and work on almost any surface.
ProSpeed LSV-1100 Laser Surface Velocimeter
The ProSpeed® LSV-1100 optical sensor measures in forward direction with laser precision. It measures reliably even under harsh production conditions with working distances up to 1.5 m. Due to the non-contact measurement principle, these laser sensors eliminate common problems of traditional contact-wheel measurement methods such as damage to delicate surfaces, slippage and thermal expansion and work on almost any surface.
Further applications in steel, aluminum and metal
- Elongation
![Elongation process in steel rolling mill using optical sensors]( "Elongation process in steel rolling mill using optical sensors")
Elongation process in steel rolling mill using optical sensors - Velocity difference
![Differential speed measurement in rolling mills using non-contact laser sensors]( "Differential speed measurement in rolling mills using non-contact laser sensors")
Differential speed measurement in rolling mills using non-contact laser sensors - Velocity measurement
![Optical speed measurement in an aluminum rolling mill for roller synchronization]( "Optical speed measurement in an aluminum rolling mill for roller synchronization")
Optical speed measurement in an aluminum rolling mill for roller synchronization - Mass flow control
![In-process measurement of mass-flow with ProSpeed LSV-2100 laser sensors]( "In-process measurement of mass-flow with ProSpeed LSV-2100 laser sensors")
In-process measurement of mass-flow with ProSpeed LSV-2100 laser sensors - Non-destructive testing
![Non-destructive testing of steel tubes]()
- Cutting length control
![Inline cut-to-length control, LSV optical sensors controlling the torch cutter of cast steel beams]( "Inline cut-to-length control, LSV optical sensors controlling the torch cutter of cast steel beams")
Inline cut-to-length control, LSV optical sensors controlling the torch cutter of cast steel beams - Continuous casting
![Reliable process control for continuous casting: optical gauges for speed and length measurement]( "Reliable process control for continuous casting: optical gauges for speed and length measurement")
Reliable process control for continuous casting: optical gauges for speed and length measurement
