Chemical Contamination Sensor for Phosphate Ester Hydraulic Fluids
Figure 11
Variation of the thermopile detector output with the water content of Skydrol LD-4. The curve with the steep slope refers to the 3480 cm-1 centre absorption band and the shallower ones to the high- and low-energy absorption bands around 3660 cm-1 and 3320 cm-1, respectively. The output signals were normalized to the 3875 cm-1 reference channel.
