iCR iCR 3600, Руководство по обслуживанию

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i
CR 3600
TM
– Service Manual
6.2 System Configuration
6.2.1 Optical Beam Path
The
i
CR 3600 contains a 664 nm 80 mW laser, laser power supply, Lens optic and two
mirrors, a scanning galvanometer, and a light collection system.
The round laser spot is focused through a collimation lens to produce a round output beam.
The beam is deflected by a galvanometer scanner to produce the scan across the plate. The
folding mirrors bend the beam and the focused laser spot travels vertically down the plate
as it moves horizontally across the scan head.
In order to reach the plate, the beam passes through an integrating collection cylinder. As it
hits the surface of the plate, the red light from the focused laser stimulates blue emission
from the image plate in direct proportion to the X-ray energy stored in the image plate as a
result of the exposure. This blue light is collected by the integrating cylinder. The red light
is blocked from reaching the photomultiplier tubes by blue glass filters.
The collected blue light is detected by photomultiplier tubes, which convert the photons
into a signal.
This signal is then logarithmically amplified, corrected for spatial variations in the system
sensitivity across the width of the screen, and then digitized by an A/D converter.
6.2.2 Galvonometer Board
The Galvo Servo board contains a feedback amplifier that results in extremely accurate
control of the mirror mounted on the shaft of the scanning galvanometer.
The galvo motor shaft oscillates back and forth through an arc of approximately 30 degrees
at a rate of 90Hz. A small mirror attached to the shaft intercepts the static laser beam and
sweeps (scans) it across the width of the image plate.
6.2.3 Indicator Board
Two LED indicator lamps are used to signal scanner power ON and SCAN status. The
SCAN indicator is turned on only while a scan is in process; it also blinks whenever the
plate is in the optical path.
6.2.4 Anti-Jitter Board
A small L shaped board located at the end of the integration cylinder.
c 2007-2009
Confidential and Proprietary
Property of
i CRco, Inc.
23 of 61 Document # 3600-02A Rev C
March 22, 2010