A concept of an infrared sensor system for oil condition monitoring
Sprache des Titels:
Fourier transform infrared (FTIR) spectrometry is an indispensable laboratory measurement method for the evaluation of the condition
of lubricating oils. This technique allows the determination of several oil properties, e.g., degree of oxidation, nitration, and soot
content. One of the most important parameters is the oxidation number, which is a measure for the oxidative degradation of the oil,
in particular of the base oil. The utilisation of a sensor assembly consisting of an IR source, IR detector, oil measurement cell, and
narrowband IR filters enables the detection of significant oil parameters at selected characteristic bands within the IR spectrum.
The applicability of the sensor concept described above is illustrated by evaluating the oxidation number from the absorption of a
significant IR band and a reference band. Our investigations showed that the implementation of an IR sensor for on-site or even online oil
condition monitoring is possible. An appropriate choice of IR filters and the development of a sensor signal algorithm enable the
determination of further oil properties, which can be derived from the infrared absorption spectrum.