Photo Multiplier Tube (Pmt); Figure 12-17: Pmt Housing Assembly - Teledyne t100 Operation Manual

Principles of Operation
12.5.3.

PHOTO MULTIPLIER TUBE (PMT)

286
The T100 uses a photo multiplier tube (PMT) to detect the amount of fluorescence
created by the SO and O
2

Figure 12-17: PMT Housing Assembly

A typical PMT is a vacuum tube containing a variety of specially designed electrodes.
Photons from the reaction are filtered by an optical high-pass filter, enter the PMT and
strike a negatively charged photo cathode causing it to emit electrons. A high voltage
potential across these focusing electrodes directs the electrons toward an array of high
voltage dynodes. The dynodes in this electron multiplier array are designed so that each
stage multiplies the number of emitted electrons by emitting multiple, new electrons.
The greatly increased number of electrons emitted from one end of electron multiplier is
collected by a positively charged anode at the other end, which creates a useable current
signal. This current signal is amplified by the preamplifier board and then reported to the
motherboard.
Teledyne API - T100 UV Fluorescence SO
reaction in the sample chamber.
3
Analyzer
2
06807F DCN7335