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FocusMonitor FM+
11.5
Selection of the measuring tip and the detector
Depending on the laser type, you must use the appropriate measuring tip and detector. The measuring tips
and detectors are available for different wavelengths, power density ranges, or beam divergences so that
measurements can be recorded at a maximum power in each case.
This ensures that an optimum configuration of the FM+ is achieved. Only one value can be exploited fully for
the power or power density.
The service life of the measuring tips depends not only on the power density but also on the cleanliness of
the surface (dust, particles, fingerprints). Therefore, the measuring tips must be treated very carefully.
Measuring tips specifications and selection of suitable detectors
The measuring tips are suitable for different power densities depending on the design. The power density
depends on the laser power and focus size.
Observe the destruction limits of the measuring tips in appendix B on page 79.
Measuring tips
Typical pinhole diameter in µm
Beam divergence/acceptance angle in mrad
Typical wavelength in nm
CO
laser
2
Laser power up to 6 kW
Laser power up to 12 kW
Laser power up to 20 kW
NIR laser
Laser power up to 6 kW
Laser power up to 12 kW
Laser power up to 20 kW
VIS laser
Laser power up to 6 kW
Laser power up to 12 kW
Laser power up to 20 kW
Geeignete Detektoren
Detector typs
Tab. 11.1:
Measuring tips specifications and selection of suitable detectors
Detectors specifications
Detector types
Laser
Sensor typ
Amplification
Wavelength range in nm
Min. beam diameter at 1 875/3 750 min
Min. beam diameter at 7 500 min
Tab. 11.2:
Detectors specifications
Revision 08 EN - 08/2023
CO
high power
2
20 – 25
< 240
9 000 − 12 000
Max. power density in MW/cm
30
20
15
Max. power density in MW/cm
—
—
—
Max. power density in MW/cm
—
—
—
DFC+
DFC+
CO
2
Pyroelectric
1
9 000 − 12 000
—
-1
—
-1
NIR high div
Diode
20
50
< 200
< 500
400 − 1 700
400− 1 700
—
—
—
—
—
—
10
5
8
4
6
3
5
—
5
—
5
—
DFIG-PS+, DFY-PS+
DFIG-PS+, DFY-PS+
DFY-PS+
DFIG-PS+
NIR/VIS
NIR
Photodiode
Photodiode
Automatic adjustment
Automatic adjustment
400 − 1 100
800 − 2 100
100
100
100 (400 − 800 nm)
100
150 (800 - 1 100 nm)
73
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