Primes HP-MSM-HB, Оригинальное руководство пользователя

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89 Revision 00 EN - 01/2021
HP-MSM-HB
35,0(6
22.2 Measuring pulsed irradiation
The CCD sensor of the HP-MSM-HB has a dynamic of 55 dB. An integration time control has been imple-
mented in order to expand this. The integration time can be freely chosen within the range of 12 µs to
186 ms.
If the
Optm. (Optimize)
function is activated in the
Single
or
Caustic
dialog window, then the LaserDiagnos-
ticsSoftware LDS will automatically – using a series of pre-measurements – set the integration time at which
the output signal of a pixel in the array is too high. The optimal integration time will then be a little below that.
Fig. 22.1: CCD settings in the dialog window CCD Setting
The integration time control magnifies the dynamics of the CCD sensor from 55 dB to over 130 dB. Once the
Optim. Function is deactivated, a set integration time can be specified in the CCD Setting dialog window in
the HP-MSM-HB (see Fig. 22.1 on page 89).
Integration time control alone isn’t enough to be able to measure the full range of pulsed lasers. If, for ex-
ample, it involves a pulsed laser with a very low pulse frequency (< 5 Hz), the maximum integration time of
186 ms will no longer be sufficient. This is why, in addition to the integration time control, a trigger option and
delay time is also implemented.
In regards to triggering, there is an internal trigger and an external trigger.
A photo diode behind a prism functions as the internal trigger.
The user can determine the limit value of the trigger (0 ... 4 096).
The trigger is preset to the value 2001 This setting works well for the majority of all applications.