Pmt System ?? This Is Not An Official Name Of Anything?? What Should I Call It - Kodak DirectView CR 800 System Theory Manual

PMT System ?? This is not an official name of anything?? what should I call it?

The purpose of the PMT system is to collect the blue light emitted from the PHOSPHOR PLATE when the PLATE is scanned, measure its intensity, and convert the
measurement to digital format. Importantly, the power of the LASER is measured at the exact instant that the blue light is measured. These 2 measurements eventually
make up the??? of the digital signal for ???
Components
Possibly the same or similar illustration from the CR
Theory section or an illustration of the collector, nose piece,
and PMTs.
1234563 – 12/12/94
A3 DIGITIZER BD While not truly a component of the PMT System, the A3
controls the operation of the GALVO BD and the A5
PMT/DAS BD to coordinate the measurement and
collection of image data. As the A3 commands the
GALVO to turn the MIRROR to sweep the beam of the
LASER across the PLATE, it also commands the PMT/
DAS BD to make measurement of the emitted light at
precisely controlled intervals. Each measurement
results in a pixel in the final collected image.
LIGHT COLLECTOR These components collect the blue light emitted from
and NOSEPIECE the PLATE and direct it toward the PMT TUBE. All of
the inside surfaces of both components are reflective.
PHOTOMULTIPLIER There are 5 PMTs in the CR 800. Each is an extremely
TUBE (PMT) sensitive light sensor, which produces a current signal
in proportion to the light striking its face. The PMT uses
a high voltage power source to operate, and the
sensitivity of the PMT varies with the voltage of he
power source.
A5 PMT/DAS BD The PMT/DAS BD amplifies the signals from the 5
PMTs, adds them together, filters the summed signal,
then converts it to a digital format in an A/D Converter.
The PMT/DAS BD also measures the strength of the
beam of the LASER and converts it to digital format in a
separate A/D converter.
A9 LASER
REFERENCE BD
OPTICAL Subsystem
9–43