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The BeamControlSystem (BCS) enables the automatic measurement of the most important laser beam parameters within industrial laser processing lines. Beam power, as well as focal measurements and power density distributions are measured by the system which is shielded, rendering it completely dust-proof.

In the field

In robot cells for laser beam welding this BCS is mounted in a reference point, for example. Each time the robot or Cartesian axes are referenced, a laser beam analysis can be initiated. The entry aperture of the BCS is opened by the robotic or master controller and a measurement cycle is started.
If the EVALUATION function is used, min-max values for focus dimensions, laser beam power etc. will have been specified, so that alarm signals can be initiated as soon as these tolerances are exceeded.
Manual evaluations allow the recording of measurement data and generation of trends. Very often focal position, focal dimension, diffraction index M2 or beam parameter product change subtly over time. This means, for example, that the heat-affected zone of a laser beam welding process could slowly but steadily expand. The thermal lag of the manufactured components would thereby increase just as steadily, and perhaps even without being noticed.

Characteristics of the BeamControlSystem

  • Focal measurement from 0.2 mm to 3 mm
  • SPS interface for communications with laser or plant controllers
  • Script-controlled automatic measuring sequences
  • Monitoring of thresholds for beam parameters
  • Electro-pneumatic closing device
  • Control and measurement data management via PC
  • Fieldbus interface optional for system integration

Measurement methods – the principle

This combination device combines the functionality of two different PRIMES products into one compact measuring device. This makes the combination device ideal for permanent integration into a laser material processing plant.

  • FocusMonitor
  • CompactPowerMonitor

Both systems communicate with a higher level controller, preferably using the script control within the PRIMES LaserDiagnoseSoftware. This enables the fully automated measurement of power and focal geometry initiated by the laser or plant controller.

The EVALUATION function allows measurement data with specified thresholds to be compared and the appropriate alarm signals to be sent back to the laser or plant controller. Overall, this enables the completely automated monitoring of the beam parameters. The combination device is enclosed and completely dust-proof. The beam entry is sealed in stand-by mode by a pneumatic closing device. This allows the measuring devices to work over the long term in a harsh industrial environment.

Measured beam parameters

In order to achieve additional certainties in the context of quality assurance, the essential laser beam parameters are monitored.

  • Beam power, typ. ± 3%
  • Focal position z, up to typ. 10% zR
  • Focus diameter, typ. ± 5%
  • Rayleigh length, typ. ± 5%
  • Beam parameter product, typ. ± 10%
  • M2, typ. ± 10%
  • Ellipticity, typ. ± 10%
  • Astigmatism, typ. ± 10%
  • Beam direction z, typ. ± 0.2 °