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Chapter 1: Cytometer Components 27
Cuvette Flow Cell
The cuvette flow cell is the heart of the BD FACSAria II cytometer (Figure 1-10).
Within the flow cell, hydrodynamic focusing forces particles through the cuvette
in a single-file stream, where laser light intercepts the stream at the sample
interrogation point.
Figure 1-10 Cuvette flow cell
The unique flow cell design permits particles to flow through the cuvette at a low
velocity (approximately 6 m/sec for the 70 micron Sort Setup), allowing longer
exposure to laser energy. The cuvette is gel-coupled to the fluorescence objective
lens to transmit the greatest amount of emitted light from the interrogation point
to the collection optics (see Optics System on page 33). After passing through the
cuvette, the stream is accelerated (to approximately 30 m/sec with the 70 micron
Sort Setup) as it enters the nozzle tip, where the drop drive breaks the stream into
droplets for sorting.
flow cell
laser beams
nozzle
nozzle locking
lever
interrogation point
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