Vaisala GMP231 - Manual (Page 18)

User's Guide _______________________________________________________________________
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Figure 4 CO
2
Measurement Inside the Incubator
1 = Chamber wall.
2 = Chamber interior.
3 = Light source.
4 = Band pass filter.
5 = Ambient air (400 ... 1000 ppm CO
2
).
6 = Light absorbed by CO
2
in the incubator gas.
7 = Thermopile detector.
8 = Fabry-Perot interferometer.
9 = Sapphire window. Separates the sensor’s active components
from the measured environment.
10 = Gold-plated mirror.
1 2
3 4
5 6
7 8 9 10