Velocimetry

- Velocimetry
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Areas of applications
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Wood and Construction Materials
Precise detection of velocity and length on wood and construction materials
Precise, reliable and non-destructive length and velocity measurement is of the utmost importance when it comes to efficient manufacturing and processing in the wood and construction materials industry. Even the slightest deviations can cause added material costs, and these can quickly add up. For that reason high-precision, non-contact measurement techniques are indispensable.
Polytec's laser surface velocimeters (LSVs) have been specially designed for high-precision velocity and length measurement. These LSVs provide you with reliable measurement data that you can easily integrate into your process control systems. Using an LSV means increasing precision and thereby increasing the quantity and quality of your output. Your advantages: Polytec's non-contact measurement technique works on almost all surfaces without causing any damage. From cutting length control in glass wool right through to length measurement for roofing materials – Polytec systems ensure that you obtain the perfect configuration for every application.
ProSpeed optical length and speed sensors support the wood and construction materials sector in...
- quality inspections and sorting of lumber
- length cutting of insulation materials
- length verification of plasterboards
- and in many more applications.
Velocity measurement on roll-fed material and piece goods
Velocity measurement is indispensable for process control and optimization in many industrial processes. It is the basis for many other applications such as cutting length control, length measurement, velocity difference. In these processes velocity is measured using the laser Doppler technique.
Laser surface velocimeters (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.
Another benefit of Polytec systems is the flexible interface concept – it enables velocity readings via encoder output, serial interfaces, LAN, Profibus and Profinet.
Practical examples:
Polytec LSVs are used for various velocity measurement tasks in the wood and construction materials industry:
- dwell time determination in coating systems, e.g. for wood and wood products
- control of cutting devices in cut-to-length processes, e.g. for wood and wood products, plasterboard, glass wool, mineral wool)

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LSV-1000 Laser Surface Velocimeter
The compact velocimeter for performing non-contact length and velocity measurements on strip products.
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..
A laser surface velocimeter (LSV) independently recognizes whether the 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
Laser surface velocimeters (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 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.
Practical examples:
Polytec LSVs are used for a variety of length measurement processes in the wood and construction materials industry:
- in the winding of sheet materials
- monitoring cut lengths, e.g. on fiber cement, plasterboard, wood and wood products, glass wool, mineral wool and roofing material

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LSV-1000 Laser Surface Velocimeter
The compact velocimeter for performing non-contact length and velocity measurements on strip products.

LSV MID Laser Surface Velocimeter
The compact and MID-certified speed and length sensors for calibrated equipment – perfect if you’re selling products by length like common in converting processes. It is certified in line with 2014/32/EU (MID).
Cut length control on roll-fed material
Determining the length and velocity provides the basis for controlling the cut length. If the sheet materials are not to be stopped in order to perform the cut, then the cutting device must move along with the sheet material for a straight cut, in other words it should be a "flying cutting device". The speed of the sheet material is measured for velocity synchronization
Laser surface velocimeters (LSVs) from Polytec are ideally suited for cut length control because they measure both velocity and length at the same time and can display the values on different interfaces. The LSVs work 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 also remains intact.
The Polytec LSV offers increased cutting precision compared to other methods and therefore allows a reduced safety margin to be added to the preset cut length. This will save costs on every cut.
Another benefit of Polytec systems is the flexible interface concept – it enables length and velocity readings via encoder output, serial interfaces, LAN, Profibus and Profinet. The digital outputs feature a pre-warning signal that indicates when the cutting length is about to be reached, as well as the cut signal for triggering the cutting process.
Practical examples:
In the wood and construction material industry Polytec LSVs are used to control cutting lengths in cut-to-length processes for, e.g. wood & wood products, plasterboard, glass wool and mineral wool.

Dear visitor, in order to be able to watch our videos please accept the cookies. All information about the usage of cookies can be found in our privacy policy
Change cookie settingsRelated products

LSV-1000 Laser Surface Velocimeter
The compact velocimeter for performing non-contact length and velocity measurements on strip products.

LSV MID Laser Surface Velocimeter
The compact and MID-certified speed and length sensors for calibrated equipment – perfect if you’re selling products by length like common in converting processes. It is certified in line with 2014/32/EU (MID).
Position tracking on sheet materials and piece goods
Position tracking plays an important role in the wood and construction materials industry if a certain position on the object being measured is essential to the process.
A laser surface velocimeter (LSV) measures the length that the object being measured covers until a defined event occurs. The length measured is then used to correlate the event to the corresponding position on the object. One example of this is flaw site detection in non-destructive materials testing.
The Length measurement can also trigger a working step at regular intervals in the process, e.g. printing labels, attaching lettering and logos or marking flaw sites.
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.
The increased accuracy of velocity and length measurement allows you to determine positions with increased precision. 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 various position detection tasks in the wood and construction materials industry.

Dear visitor, in order to be able to watch our videos please accept the cookies. All information about the usage of cookies can be found in our privacy policy
Change cookie settingsRelated products

LSV-1000 Laser Surface Velocimeter
The compact velocimeter for performing non-contact length and velocity measurements on strip products.