Monday, June 18, 2007 - 11:30 AM
The Kestrels (Boise Centre on the Grove)

Developing an In-Situ Sensor for Monitoring Oil Quality

B. Marx, Michael F. Hurley, D.P. Butt, and Matthew Luke. Boise State University, Boise, ID

In order to meet the objectives of an oil quality, corrosion sensor for a prognostic engine health monitoring system, a two component sensor was considered. The first component was comprised of two electrodes and was used for making Electrochemical Impedance Spectroscopic (EIS) measurements for monitoring oil quality. Because the EIS technique is capable of resolving small changes in the electronic properties of a system, such as degradation and/or contamination, it is being exploited as a technique for monitoring oil quality. EIS tests were run on oils containing various additives and on oils contaminated with water. The data was analyzed using equivalent circuit modeling and the results obtained from two equivalent circuit models are compared. Both models provided good fits to the data and yielded information possibly pertaining to the characteristic time constants and relaxation frequencies associated with the additives and water molecules present in the oil.