the scan on the second axis worked now. the acceptance angle is wider in this direction.
the center of the fiber is (dac 1550 2500).
use multiple threads, so that arduino generates trigger when camera is waiting
i'm trying to get better timer resolution than 1s but it doesn't work
i had to repopulate /usr/lib64/clozurecl/x86-headers64/libc/, now get-universal-time-usec works
bug in get-universal-time-usec
get-universal-time-usec needs calls from ccl package
triggering of the cameras didn't work because i forgot to set the arduino digital pins to output
camera 3 runs continuously and triggered  at 600x600 now.
with fft and processing i obtain 4fps.
without fft and processing i obtain 12.6fps.
i tried to get rid of one copy operation. but the code isn't really much faster (126 images in 27.5s instead of 31.5s)