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22 PI-MAX
®
4 System Manual Issue 4
4. When the electrons exit the channels they are further accelerated by a constant high
voltage (5-6 kV) and strike the phosphor coating on the fluorescent screen causing it to
release photons.
Because of the MCP gain, there are now many photons for each
photon that struck the photocathode surface.
5.
The photons released by the coating are transferred to the surface of the CCD (via
fiber-optic) and produce charge at the pixels they strike. Note that fiber-optic coupling
is not only the most efficient coupling possible, but lens-coupling effects such as
vignetting are eliminated.
6. Charge accumulates in the pixel wells until the intensifier is gated off (the photocathode
is more positive than the MCP input) and the phosphor decays.
7. At that point, the accumulated charge is shifted to the serial register where it is read out
to an on-chip amplifier that converts the charge to an analog voltage.
8. This voltage is input to the selected analog-to-digital (A/D) converter(s) where it is
digitally encoded. The conversion speed and the quality of the data are dependent on the
effective ADC rate.
9. The digitized information is transmitted from the camera through the Ethernet cable to
the interface card in the host computer where it is stored in RAM.
10. The application software retrieves the information from RAM, processes it, displays it,
and/or stores it to a file according to user-defined settings.
1.3 Safety Related Symbols Used in This Manual
CAUTION!
!
The use of this symbol on equipment indicates that one or more
nearby items should not be operated without first consulting
the manual. The same symbol appears in the manual adjacent
to the text that discusses the hardware item(s) in question.
WARNING! RISK OF ELECTRIC SHOCK!
The use of this symbol on equipment indicates that one or more
nearby items pose an electric shock hazard and should be
regarded as potentially dangerous. This same symbol appears
in the manual adjacent to the text that discusses the hardware
item(s) in question.