4.2 Controlling the PM100D
4.2.4.3 Pyroelectric Energy Sensors
With pyroelectric sensors the PM100D measures laser pulse energy of single and
continuously repeating laser pulses (short pulse). Pyroelectric sensors of the
Thorlabs ES100C and ES200C series can work with the PM100D console. The
sensor will be ready to operate few seconds after plugging.
Attention
Refer to the sensor data sheet and pay attention to the optical
damage threshold!
Exceeding these values will permanently destroy the sensor!
A pyroelectric sensor permits widely independent of the incident radiation
wavelength, the direct transformation of a radiation energy pulse into a voltage pulse.
The height of this voltage pulse that is proportional to the laser pulse energy is
measured by a peak detector circuit.
When a pyroelectric sensor is connected the PM100D cannot be switched in auto-
range mode. The measurement value will be updated with each incoming pulse.
When no pulses appear the measurement display will be held on the last measured
value until the Reset button in the Meas Config X menu will be pressed.
4.2.4.3.1 Trigger Level
The trigger level can be set in the Meas Config X menu with the Trig XXX % button.
When an incoming pulse exceeds the set trigger level, the peak detector circuit gets
armed and is waiting until the pulse peak is reached. After finding the maximum
voltage the level is kept and the microprocessor reads the AD converted voltage for
displaying the pulse energy. Finally the peak detector circuit gets a reset and is ready
for the next pulse.
The trigger level can be adjusted between 1% and 70% of each selected energy
range. Only pulses that are higher than the adjusted trigger level are recognized by
the PM100D. The trigger level should be set between the noise level and the
expected pulse height.
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