Cube
30
Revision 10 EN - 03/2021
12.4 Measurement with pulsed lasers
When it comes to pulsed laser radiation a correct exposure time measurement up to a
pulse frequency of 10kHz and a duty cycle of 50% is possible. In case of on/off times
shorter than 50μs a correct exposure time measurement is not possible.
With pulsed lasers, the device recognizes the number of pulses n and the number of
pulse pauses n-1. Since the last pulse pause t
off
is not measured for technical reasons
and this would lead to an increased display of the average power with a low number of
pulses, the average power is corrected on the basis of the corrected burst duration (see
Fig. 12.5 on page30).
For cw lasers respectively one pulse, the average power corresponds to the maximum
power of one pulse.
When measuring pulsed lasers, which have an oscillating switch-on and switch-off
behavior, incorrect measurements of the number of pulses can occur. However, these
incorrect measurements have no effect on the calculated average laser power and
energy.
t
on
t
off
t
off
Pulse 1 Pulse 2 Pulse 3
Pulse 4
Pulse 5
Uncorrected burst duration
Corrected burst duration for the calculation of the average laser power
Laser power P in W
Time t
Fig. 12.5: Uncorrected and corrected burst duration with pulsed lasers
To Next Page
Loading...
Need help?
General
