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3
System Description
38
the spectrum. The light emitted is directly proportionally to the
amount of nitrogen in the sample:
NO + O
NO
+ O
3
2
2
NO + O
NO
+ O
+ h (~600 to 3,000 nm)
3
2
2
The light (h
) emitted by the chemical reaction is optically
filtered and detected by a PMT. A chiller cools the PMT to
reduce thermal noise and help measure infrared light. The
signal from the PMT is amplified for display or output to a data
system.
SCD and NCD User Manual
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Troubleshooting
