Write us

Fagus GreCon, Inc.648 Griffith Rd. Suite A
Charlotte, NC 28217U.S.A.

To contact form

Contact persons


Non-contact inline length and speed measurement with laser technology (Doppler effect)

The measuring system LENGTHCONTROL determines the length and the speed of solid, soft and moist materials by recording the measured value without contact with laser beams. The optimization of the documentation and control processes for our customers is in the focus when the length measuring system is used. However, also material costs by reduction of the cutting scrap are saved. For example, a too long board means too high material and production costs for the manufacturer, even if the board is still acceptable for the customer. Thanks to the 100% measurement of the board length, cutting by a diagonal or dividing saw is monitored and continuously corrected.
Exact graphical and numerical displays make a timely intervention of the operator into the cutting process possible. A uniform board quality and an optimal use of material and energy can be achieved.
The measured values can be recorded up to the edges of the material. Depending on the requirements, the lengths and the speed can be determined at panel-shaped products or even in case of the endless application.
The GreCon LENGTHCONTROL is the ideal solution especially in case of production systems with a very high throughput speed, with confined space conditions or in case of an unfavorable ratio between board length and speed. In addition, the average density can be determined and used for process optimization by an optimal connection to a GreCon thickness gauge.

Benefits at a glance

  • No slippage as with conventional touching measuring methods, thus higher measuring accuracy
  • Each plate is measured precisely in the longitudinal direction. Random measurements with a tape measure are omitted. Thus, there is a larger database and higher process reliability.
  • The safety of their employees increases, as no access to production is required.
  • High repeatability due to non-contact measuring method, manual measurement with tape measure is not necessary


LENGTHCONTROL uses the double beam interferometer technology for precise measurements of the speed.The measured speed determines the length of the moving parts via the time. The beam is split and intersects in the room.The two transverse beams interact forming a border pattern which is orthogonal to the plane of the two beams.The light is scattered if the material runs through the measuring zone. This scattered light is detected by the measuring unit and converted into electrical signals. The frequency of the electrical signal includes information on the speed of the material. The signal processor converts the electrical signals into frequency information which is directly proportional to the speed of the material that passes the laser beams. The signal processor converts the information into speed information and updates the data for the user. The measuring unit measures the quantity of the reflected laser light to find out whether an object is in the measuring zone.


  • The core of the software package is the visualisation. All measured data are recorded, logged and graphically processed here. The easy menu structure adapted to all measuring systems allows an intuitive and user-friendly operation.
    The ergonomically designed software based on the operating system Windows makes an easy handling of the system possible. The recorded measuring values are processed and shown in a clear structure.
    The system can be adapted to the requirements by visualisation software in modular design so that an operation of the system with different applications is possible. Furthermore, the surface of the visualisation software can be compiled according to your requirements.

    • Measured data
      The measured data is output graphically and numerically:
      • representation of the position of tolerance violations;
      • display of numerical parameters as information on the production type or statistics.
    • The system can be adapted optimally to the different requirements by means of recipes. The structure of the recipe management is very simple. The input of panel-specific data allows the operator to start measurement with few mouse clicks. The start of a measurement and the necessary selection of a recipe make the integration of the measuring system into the process chain possible.
      All specified values of a production type are saved in the recipe management. Also all measuring-specific parameters are filed under the production type besides the production parameters as for example
      • panel thickness;
      • panel width;
      • panel length;
      • raw density;
      • tolerances.
    • All panel data is saved with the recipe parameters and the measuring results in an SQL database.
    • Representation of the position of tolerance violations of historical panels and their scope.
    • Easy search function by date and time.
    • Export of panel data.
    • A printout of the current graphics shown on the screen is possible at the push of a button.
    • It is possible to generate a log of types and print it out.
    • Furthermore it is possible to output a screen dump of the history for statistical purposes. The data can be exported from the history management in the standard file format XLS.

Automatic Calibration

The quality of the measured results mainly depends on the uniform conditions during the measuring process. Both measuring sensors are calibrated before each measurement to achieve high measurement accuracy.
For this purpose, a calibration sample is swivelled into the measuring range and an automatic calibration is carried out for both measuring sensors.


  • Chipboards
  • MDF boards
  • HDF boards
  • Hardboards
  • OSB boards
  • Insulated material

Technical Data

  • Supply voltage 230V AC, 50Hz, L1,N,PE
  • Places of installation Downstream to the diagonal saw and the sanding line
    Ambient temperature 5 to 45 °C
    Relative humidity non-condensing
    Production type IP54
  • Material type Wood-based material and insulation material
    Panel thickness up to a strength of 75mm
  • Number 1
    Measuring method Laser, Doppler effect
    Measuring range The length can be measured in an almost unlimited way. The manufacturer does not specify any upper limit.
    Repeatability ±0.0 2% of the measured value (from practice: ± 1 mm (± 2σ) on a board with a length of 5m)
    Resolution 1mm
    Minimally recognizable error size 1mm
    Measuring speed max 250 kHz
  • RS 232
    RS 422

Consult our experts

We will be more than happy to help you:


Fagus GreCon, Inc. offers a network of sales and service partners with internal qualified service staff. Thus, a competent partner is available to you anytime and anywhere.

  • Our experts ensure an optimal and reliable function of your GreCon measuring systems in agreed intervals.

  • The GreCon measuring systems are equipped with the GreCon Remote Support to support the operators. This system makes a safe, easy and quick remote support possible in case of any possible failure, to control the system or to answer questions.

  • Fagus GreCon, Inc. offers a continental network of subsidiaries and sales and service partners with internal qualified service staff. Thus, a competent partner is available to you in case of need within very short time and in short distance.

Your customer advisors for Measuring Systems

 Erin Lloyd
Erin LloydFagus GreCon, Inc. - Measuring systems 704-594-8493
 Jamie Nott
Jamie NottFagus GreCon, Inc. - Fire prevention, Fagus GreCon, Inc. - Measuring systems 705-987-3488