In
the
test
set-up
for Clic, Rasnik and Rasdif systems are used. Rasnik uses the
conventional coded mask and a central lens. Rasdif uses a laser and a
diffraction plate in the middle.The lightsources have to be remote
controlled to prevent optical crosstalk. A switchbox
has been developed which is controlled via USB. It contains LED and
laser drivers
and some monitoring. It handles a maximum of 32 LEDs and 16 solid state
(DPSS) lasers. The lasers
are just switched on or off. The LED current can be set in 128 steps.
Two LEDs
can be on at the same time, with a maximum current of 150 mA
each. The current of each LED is set and
limited inside the module. Two lasers can be on at the same time, with
a
maximum current of 400 mA each.
Only the total current is monitored. Divided by the number of active
systems, this gives the average current of a channel.The module contains
16 RJ45 connectors, each handling two LEDs and one laser.
Observing the current
constraints, any combination across the module is possible. The micro
controller will monitor the currents. These can be read out via USB.
suggestions
for
this
page
to:
Henk
Groenstege.