Teledyne T100 用户手册

The Model 100 E UV Fluorescence SO

2

 Analyzer is specifically designed to create these 

circumstances.  

  The light path is very short (x).  
  A reference detector measures the intensity of the available excitation UV light and 

is used to remove effects of lamp drift (I

).  

  The temperature of the sample gas is measured and controlled via heaters attached to 

the sample chamber so that the rate of decay (k) is constant. 

  A special hydrocarbon scrubber removes the most common interfering gases from 

the sample gas.  

  And finally, the design of the sample chamber reduces the effects of stray light via 

its optical geometry and spectral filtering.  

The net result is that any variation in UV fluorescence can be directly attributed to 
changes in the concentration of SO

2

 in the sample gas. 

The optical design of the T100’s sample chamber optimizes the fluorescent reaction 
between SO

2

 and UV Light (refer to Figure 13-2) and assure that only UV light resulting 

from the decay of SO

2

* into SO

2

 is sensed by the instruments fluorescence detector.  

UV radiation is generated by a lamp specifically designed to produce a maximum 
amount of light of the wavelength needed to excite SO

2

 into SO

2

* (214 nm) and a 

special reference detector circuit constantly measures lamp intensity (refer to (Equation 
13-2)). A Photo Multiplier Tube (PMT) detects the UV given off by the SO

2

* decay 

(330 nm) and outputs an analog signal. Several focusing lenses and optical filters ensure 
that both detectors are exposed to an optimum amount of only the right wavelengths of 
UV. To further assure that the PMT only detects light given off by decaying SO

2

* the 

pathway of the excitation UV and field of view of the PMT are perpendicular to each 
other and the inside surfaces of the sample chamber are coated with a layer of black 
Teflon

®

 that absorbs stray light. 

 

 

06807C DCN6650