Andor Technology Neo sCMOS, Руководство по оборудованию

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FEATURES & FUNCTIONALITY
Neo
SECTION 2
Page 32
2.3.3.1 - Example application scenarios for Global Shutter mode
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Applications that require ‘microsecond’ time gating synched to a pulsed light source, e.g. L aser I nduced
B reakdown Spectroscopy ( LIBS ). Global readout involves a step that simultaneously transfers the signal
charge of each pixel into the corresponding readout node for that pixel. This transfer step is 2 μ s,
facilitating fast exposure end, i.e. ‘electronic gating’
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‘Double Exposure’ applications, e.g. P article I maging V elocimetry ( PIV ), which requires that two back-to-
back exposures are acquired with minimal time separation between them. The global shutter 2 μ s transfer
time into the readout node defines the minimum time between two consecutive exposures
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Applications that require exact time correlation between two (or more) points of an image that are
separated vertically within the image. In rolling shutter it takes 10 μ s per row for the 2x readout fronts to
move across the image from the centre outwards, reading out row at a time. At 560 MHz pixel readout rate,
this represents 10 ms to cover the distance from centre to outermost rows. That means an object at the
centre of the image will begin and end an exposure ~10 ms before an object located at the very top or
bottom (although remember that each object will be subject to the same overall exposure time). If a
particular application requires that ‘moving or changing’ objects separated by relatively large distances
(vertically) be subject to the same beginning and end of exposure, then global shutter mode is required
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Applications where the entire field of view is fast moving (relative to exposure time), e.g. high speed
machine vision inspection, such as PCB inspection