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116
Figure 7-1:
7.3
Reduce Spectral Readout Time by Using the Custom
Chip/Timing {Custom Sensor} Feature
This feature allows you to redefine the size of the EMCCD's active area via software.
Unlike setting a smaller Region Of Interest (ROI), which also involves reading out fewer
pixels, Custom Chip {Custom Sensor} mode does not incur overhead from discarding or
skipping the rest of the rows. And, unlike both Binning and ROI, Custom Chip also relies
on array masking to ensure that no light falls outside the currently set active area.
To take full advantage of the outstanding speed offered by Teledyne Princeton
Instruments ProEM:1600 cameras for spectral data acquisition, users need to utilize the
Custom Chip {Custom Sensor} and Custom Timing modes via Teledyne Princeton
Instruments WinX or LightField software. These custom modes yield much faster
spectral rates than those achievable using a region of interest (ROI).
Teledyne Princeton Instruments PVCAM
users can utilize Custom Chip and Custom Timing modes, as explained in their
respective manuals.
7.3.1
Approximation of Spectral Readout Time
Calculating the precise spectral rate is quite complicated. Assuming that Full Vertical
Binning (FVB) is active, vertical shift time is 2
settings are Multiplication Gain {Electron Multiplied} and Rate {Speed} = 4 MHz, then for
a ProEM:1600
approximate contributions to the readout time:
ProEM System Manual
Vacuum Window Transmission Data
100
90
80
70
60
50
40
30
20
10
0
200
300
400
(2)
, you can get the approximate rate by adding up the following
0.4 ms for shifts
0.4 ms for EM register clean
0.4 ms for reads
0.4 ms x 2 for pre- and post-dummy skips
A little bit of overhead
Total: 2.07 ms
500
600
700
Wavelength (nm)
®
/PICam and National Instruments LabVIEW™
s and the Analog to Digital Conversion
Issue 3
VIS-AR
NIR-AR
NO AR
UV-AR
800
900
1000
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