Endress+Hauser SS500 - Page 11

BA02191C SS2100 TDLAS H
2
S Gas Analyzer
Endress+Hauser 1-7
Figure 1–2 Typical raw signal from a laser diode
absorption spectrometer with and without mirror
contamination
3.0
2.5
2.0
1.5
1.0
0.5
Incident Energy I
0
(l)
Raw Signal, I (l)
Raw Signal, I (l)
(Contaminated
Wavelength [a.u.]
Signal [a.u.]
0.0
Figure 1–3 Typical normalized absorption signal
from a laser diode absorption spectrometer
1.0
0.99
0.98
0.97
0.96
0.95
Normalized Absorption Signal
Wavelength [a.u.]
Wavelength [a.u.]