Primes PROFINET - Laser Parameter Setting; Setting the Laser Rise Time

PowerMeasuringModule PMM
35,0(6
37
Revision 13 EN - 02/2023
8 Laser parameter setting
For correct measurements and to protect the device from damage, the following parameters must be ob-
served and adhered to.
8.1 Setting the laser rise time
The applicable irradiation time is between 0.1–2.0s resp. 0.1–1.0s for PMM type AP3s, which has to be
transferred to the laser controller as pulse duration/burst duration.
For high measurement accuracy, make sure that the rise time of the laser does not exceed 1% of the irradia-
tion time (in some cases, even 2% may be acceptable).
Example: If an irradiation time of 500ms is selected, the rise time of the laser must be <5ms. Many industri-
al lasers have a rise time <0.1ms, so this point can be ignored in most cases.
P
Max
P
Meas
t
t
p
t
0
P
>1% of the irradiation time
Fig. 8.1: Laser rise time>1% of the irradiation time (schematic)
P
Max
≙ P
Meas
t
t
p
t
0
P
< 1% of the irradiation time
Fig. 8.2: Laser rise time <1% of the irradiation time (schematic)