
Chapter 2: Theory of Operation 61
Figure 2-14 Sorting
Drop Formation
The BD FACSAria II cytometer constantly applies drop drive energy to the
stream. Droplets form as soon as you turn on the stream. Sample interrogation
takes place upstream of the stream vibration so that analysis is not affected by
the drop drive.
A drop breakoff image is created using an LED strobe and a video camera. The
image is displayed in the Breakoff window. (See Breakoff Window on page 62.)
Patented Sweet Spot technology analyzes the drop breakoff image and provides
feedback to the appropriate cytometer controls.
Charge is applied via the stream-charging wire in
the barb.
Sample generates light scatter and fluorescence
signal. Signal is analyzed.
The charged droplet breaks off.
Deflection plates attract or repel the charged
droplet.
Uncharged droplets pass to waste.
Charged drops containing particles of interest are
collected.
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