High-Speed Pyrometers

Pyrometer models Metis H3 with integrated optics and as fiber optics design.

Metis H3 high-speed pyrometers measure temperatures many times faster than standard devices and thus open up special applications such as:

  • Thermal process control with simultaneous laser power control
    • in the additive manufacturing:
      • Powder bed welding (SLM / SLS)
      • Laser cladding (LMD)
    • in laser soldering
    • in laser hardening
    • in laser welding of plastics
  • Create detailed temperature profiles of rapidly passing parts.

High-speed pyrometers are available in 2 measuring methods:

1-Color Pyrometers

1-color pyrometers with an exposure time of < 20 μs for more than 50,000 measurements / s (50 kHz measuring frequency) are mainly used for measurements and laser power control in plastic welding.

H318: 120…800°C, 1.8 µm, 40 µs
Messbereiche120–520°C
180–800°C
Spectral range1,65–2,1 µm
Response time / exposure time< 40 µs / < 20 µs
Smallest spot size 0.4 mm
Datasheet (pdf)Manual (Downloadbereich)

2-Color Pyrometers

2-color pyrometers with an exposure time of < 40 μs for more than 25,000 measurements / s (25 kHz measuring frequency) are mainly used for measurements and laser power control in hardening and steel cladding.

H322: 350…3000°C, 1.6 µm, 80 µs
Messbereiche350–800°C
400–1200°C
500–1300°C
550–1400°C
600–1600°C
700–2300°C
1000–2500°C
1300–3000°C *)
Spectral rangeChannel 1: 1.65–1.8 μm /
Channel 2: 1.45–1.65 μm
*) Channel 1: 1.64 μm /
Channel 2: 1.4 μm
Response time / exposure time< 80 µs / < 40 µs
Smallest spot size 0.8 mm
Datasheet (pdf)Manual (Downloadbereich)
Collage of several laser applications

Features

Sensortherm PID icon
  • Extremely compact devices for temperature measurement and simultaneous PID control.
  • Analog and digital inputs and outputs for direct manipulated variable output, external device control as well as switching signals on temperature events.
  • SensorTools software for easy setup of the parameters as well as for measurement recording and visual presentation.
  • Built-in recalibration function for easy on-site temperature calibration.
  • Completely self-sufficient operation via control commands from existing systems.
  • Easy integration with laser systems (in laser processing optics) or in existing system concepts.

Typical Application Examples

For many laser processes in additive manufacturing or laser cladding, laser hardening or laser plastic welding, high-speed pyrometers can be used to generate a controlled actual temperature with the smallest deviations from the setpoint temperature. This opens up completely new possibilities for process window finding.

Additive manufacturing

First layers of an additively manufactured blade show a uniform material coating.

The temperature-controlled additive manufacturing produces a uniform material coating even at directional changes.

First layers of an additively manufactured blade show an uneven material coating.

The constant laser power causes uneven material coating, especially at directional changes.

Software screenshot showing a uniform material temperature and the given laser output.

Temperature control provides excellent results in additive manufacturing.

Software screenshot showing uneven material temperature when using a constant laser output power.

The constant power output of the laser causes an uneven temperature.

Laser hardening (video)

Temperature-controlled laser hardening produces perfect hardening results by suitable temperature control. Also with paused laser, different speeds or scale.

After removal of the oxide layer, no melting can be seen.

Temperature-controlled laser hardening allows consistent results without burn-off, even with different surface conditions such as threaded holes with thin or sharp edges.

Measuring Methods / Pyrometer Coupling

The pyrometer can be mounted next to the processing laser mounted aligned to the heated measuring point or coupled into the laser head. The measurement is then always at the same location where the laser is positioned.

Coupled systems offer the advantages:

  • Closed system without lens contamination.
  • On-Axis-couplings are also possible in laser heads with mirror and rotary scanners.
  • The measurement of complex workpiece geometries with laser power adjustment in near real time offers a professional alternative to the conventional thermal process control with thermal imaging cameras, which only allow retrospective quality control but do not actively interfere with the laser control process.

pdf-Icon

Our pdf brochure “Highspeed Pyrometers for Laser Power Control” provides an overview of the system, devices and possibilities.


We recommend a personal pre-advice consultation before you decide to use a device.