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t16:
When the calculations have been completed (or a fatal error has occurred), the flags "finished"
and "idle" are set.
If the "measurement failure" flag is set, a fatal error has occurred and the measurement or calculation
was aborted. The cause of the error is encoded in the register "Error identifier".
If "measurement failure" is not set, the measurement and calculation was carried out successfully
and the results can be found in the "beam parameter" results registers. The maximum value of
the raw data and an indication of how many pixels were overridden is encoded in the high byte of
the status word.
The flag "irradiation failure" may be set; in this case, a non-fatal error has occurred (measurement
signal level too high or too low, beam lies at the edge of the measurement window). The cause
is encoded in the register "Warning identifier". Beam parameters were nevertheless determined;
these are then available in the results registers.
The power measurement is also carried out during the beam parameter measurement and calculation.
t17:
After a short Laser ON time, the power module detects the laser pulse from the increase
in temperature of the absorber. The "ready" flag in the FPM status word is deleted and the
thermalization phase of the absorber is indicated by "measurement running".
t18:
After approx. 1 s, when the laser has been switched off again, the shutter can also be closed
again (set flag "FPM_do_close_shutter").
t19:
When the "shutter_is_closed" flag is set in the FPM status word, this has happened. "FPM_do_
close_shutter" can then be deleted.
t20:
After the end of the thermalization phase (approx. 11 seconds), the pulse duration may be determined
and the measurement results (power, energy) are calculated.
t21:
When the calculations have been completed, the results are written to the results register of the
power measurement. In the FPM status word, "measurement running" is deleted, "measurement
finished" and "idle" are set. The results can now be read out.
Results, error flags and identifiers are retained until the next measurement is initiated.
74
FocusParameterMonitor FPM
Revision 06 EN 02/2023
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