Agilent 5DX Service Guide 8-21
5DX Series 3 Imaging Subsystem Components
A discussion of the Rotary Scintillator Assembly would not be complete without
discussing the following:
• Rotary Axis Servomotor — Provides the rotational motion for the Rotary
Scintillator Assembly.
• Scintillator — Converts the X-ray emissions into visible light.
• Mirrors — Reflect the visible light emitted by the Scintillator such that the
image can be captured by the stationary X-ray Image Camera.
• Digital Rotary Encoder — Provides information for determining the position
of the Rotary Scintillator Assembly about the Rotary Axis.
• Scintillator Home Optical Sensor — Detects when the Rotary Scintillator
Assembly is at the Reference Home position.
• Rotary Scintillator Reference Home Position — A reference position used for
synchronizing the deflection of the Electron Beam to the rotation of the Rotary
Scintillator.
Rotary Axis Servomotor
The Rotary Axis provides the rotation for the Rotary Scintillator. The Rotary
Scintillator Assembly is belt-driven by the Rotary Axis servomotor, as shown in
Figure 8-12. The Rotary Axis servomotor spins twice for every single rotation of
the Rotary Scintillator for a ratio of 2:1. Under normal operating conditions, the
Rotary Axis servomotor spins at 1500 revolutions per minute (rpm), and the
Rotary Scintillator spins at 750rpm.
The Rotary Axis servomotor is located in the Motion Driver Assembly and
receives drive control from Motion Controller #2 located in the Expansion
Chassis. The speed of the Rotary Scintillator Assembly is based upon feedback
from an optical encoder.
Scintillator
The Scintillator is located at the top of the Rotary Scintillator Assembly, as shown
in Figure 8-12. The Scintillator provides the means to convert the Slice image X-
rays into visible light. The Scintillator is an aluminum plate coated on the bottom
side with a radio luminescent material. The X-rays emitted by the X-ray Tube
Assembly, pass through the panel under test and hit the Scintillator. As these
particles pass through the Scintillator, the radio luminescent material becomes
excited and illuminates, producing an X-ray Laminography image.
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