8-22 Imaging Subsystem
Imaging Subsystem Components 5DX Series 3
Mirrors
Inside the Rotary Scintillator Assembly is a periscope style mirror assembly, as
shown in Figure 8-11. The mirrors reflect the Slice image such that the image may
be captured by the stationary X-ray Image Camera.
Digital Rotary Encoder
Internal to the base of the Rotary Axis Servomotor is the Digital Rotary Encoder.
The location of the Digital Rotary Encoder and the output signals it produces are
shown in Figure 8-12.
Figure 8-12: Digital Rotary Encoder
The Digital Rotary Encoder provides three types of output signals to the X-ray
Scan Controller (refer to Figure 8-5 on page 8-11 for a timing diagram of these
signals):
• Pulse A and Pulse B — Used for incremental counting required to keep the
Electron Beam synchronized to the Rotary Scintillator. There are 16,384
counts per revolution. Also used to determine the direction of rotation of the
Rotary Scintillator Assembly. Pulse B is 90° out-of-phase from Pulse A. When
Pulse A leads Pulse B, the Rotary Scintillator is traveling in a counter-
clockwise direction. When Pulse B leads Pulse A, the Rotary Scintillator is
traveling in a clockwise direction.
Z
Revolution Count
A
B
Timing &
Directional Pulse
Z
Top View Side View
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Timing &
Directional Pulse
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