Figure 9-5: Pmt Optical Filter Bandwidth - Teledyne T100 Instruction Manual

Theory Of Operation
9.1.7.2. PMT OPTICAL FILTER
228
The PMT used in the T100 reacts to a wide spectrum of light which includes much of
the visible spectrum and most of the UV spectrum. Even though the 214 nm light used
to excite the SO is focused away from the PMT, some of it scatters in the direction of
2
the PMT as it interacts with the sample gas. A second optical band pass filter placed
between the sample chamber (refer to Figure 9-2) and the PMT strips away light outside
of the fluorescence spectrum of decaying SO
UV form the source lamp and other stray light.
5
10
4
10
3
10
2
10
1
10
1
0
100

Figure 9-5: PMT Optical Filter Bandwidth

06807A(DCNxxxx)
Teledyne ML - T100 UV Fluorescence SO2 Analyzer
* (refer to Figure 9-5) including reflected
2
PMT OPTICAL FILTER
BANDWIDTH
200 300
WAVELENGTH (nm)
SO * FLUORESCENT
2
SPECTRUM
400 500