APS-2BM-MIC / ipython-user2bmb

ipython configurations for the tomography instrument
2 stars 5 forks source link

what is ideal acquire time? #47

Closed prjemian closed 6 years ago

prjemian commented 6 years ago

total time for tomo scan (with darks & flats), rotation speed, and comments

prjemian commented 6 years ago
acquire_time, s total time, s rot speed, deg/s comment
0.008 90.37 10.909 Missed 7 out of 10 darks & flats
0.01 88.23 9.231 Missed 4 out of 10
0.015 85.61 6.667 Missed 1 of 10
0.02 88.72 5.217
0.05 122.85 2.264
0.1 194.99 1.165
0.11 212.37 1.062
0.15 269.53 0.784
prjemian commented 6 years ago

empirical determination of readout_time as 3 ms based on adjusting rotation speed to not drop image frames. (Rotation speed is dependent on readout_time, among other things.) At 2.5 ms, dropped one frame, at 2 ms, dropped 6 frames. Probably, best value between 2.5 and 3 ms. Good to have some extra room.

prjemian commented 6 years ago

Other factors are also important, such as incident beam intensity. These numbers are for PG3 camera in 8-bit setting.

prjemian commented 6 years ago

screenshot from 2018-08-19 17-34-16