Linear variable filter based oil condition monitoring systems for offshore windturbines
2011
A major part of future renewable energy will be generated in offshore wind farms. The used turbines of the 5
MW class and beyond, often feature a planetary gear with 1000 liters lubricating oil or even more. Monitoring
the oil aging process provides early indication of necessary maintenance and oil change. Thus maintenance
is no longer time-scheduled but becomes wear dependent providing ecological and economical benefits. This
paper describes two approaches based on a linear variable filter (LVF) as dispersive element in a setup of a cost
effective infrared miniature spectrometer for oil condition monitoring purposes. Spectra and design criteria of a
static multi-element detector and a scanning single element detector system are compared and rated. Both LVF
miniature spectrometers are appropriately designed for the suggested measurements but have certain restrictions.
LVF multi-channel sensors combined with sophisticated multivariate data processing offer the possibility to use
the sensor for a broad range of lubricants just by a software update of the calibration set. An all-purpose oil
sensor may be obtained.
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