An optoelectronic monitoring system for aviation hydraulic fluids

Andreas Helwig, Konrad Maier, Gerhard Müller, Torsten Bley, Jörg Steffensky, Horst Mannebach

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations


A non-dispersive infrared (NDIR) sensor system has been designed to monitor the state of contamination and degradation of aviation hydraulic fluids. Core part of this system is a MOEMS subsystem consisting of a micro cuvette, a MEMS thermal IR emitter and a four-channel thermopile array. For ruggedness, this MOEMS subsystem is integrated into a high-pressure resistant metal package. The MOEMS subsystem measures the transparency of the fluid under test at four specifically chosen spectral channels. Three of these channels allow the water content, the total acidity number and the remaining acid scavenger reserve to be monitored. The forth channel serves for calibration and self-test purposes. Fluid monitoring systems of this kind will form key components in an innovative AIRBUS aircraft maintenance system.

Original languageEnglish
Pages (from-to)233-236
Number of pages4
JournalProcedia Engineering
StatePublished - 2015
Externally publishedYes
Event29th European Conference on Solid-State Transducers, EUROSENSORS 2015; Freiburg; Germany; 6 September 2015 through 9 September 2015. - Freiburg, Germany
Duration: 6 Sep 20159 Sep 2015


  • Hydraulic fluid monitoring
  • Non-dispersive infrared
  • Optical sensors
  • Scavenger depletion
  • Total acid number
  • Water content


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