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12.2
Timing diagrams
12.2.1
Timing diagram power measurement
As soon as the shutter is open, the device is ready for operation. In order to initialize the measuring device for
the measurement, the bit „start" has to be set in the "Command"-byte by the external control (see Fig. 12.1).
Fig. 12.1:
Timing diagram power measurement
t1:
To confirm that the start command has been received, the measuring device sets the "Acknowledge"
flag and deactivates "Idle".
t2:
The command "start" must then be deleted.
t3:
Once "Start" has been deactivated again, "Acknowledge" is deactivated.
t4:
Once it is ready to measure, "Measurement Finished" is deactivated and "Ready" is set.
t5:
The laser pulse can then be triggered (shoot at the absorber for the calculated period of time or
optional pulse length measurement).
t6:
After a short time, the measuring device will detect the laser pulse due to the increase in temperature
of the absorber. The "Ready" is deactivated and the thermalization phase of the absorber is displayed
in the status byte by the "Measurement Running" bit.
After about 1 s, the shutter can be closed again ("FPM_do_close_shutter" flag set).
t7:
After the thermalization phase ends (approx. 11 seconds), the pulse length can be determined if
applicable and the measuring results (power, energy) calculated.
t8:
Once calculations are finished, the results log is populated; "Measurement Running" is deactivated,
and it is set to "Measurement Finished" and "Idle". The results can now be read out.
66
FocusParameterMonitor FPM
Revision 06 EN 02/2023
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