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Using Time Domain Reflectometry to Measure Fluid Properties for IVHM Applications
Technical Paper
2015-01-2593
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Time Domain Reflectometery (TDR) is a Radio Frequency (RF) technology that has been used for many years to find cable breaks and measure fluid levels in industrial processes. The technology uses picosecond length pulses and the associated reflections off the fluid surface in a time of flight measurement to determine fluid height. TDR signals have additional information that can be processed and utilized for Integrated Vehicle Health Management (IVHM) applications. For example, when water collects in the fuel tank, TDR is capable of identifying and measuring the amount of water. This can allow the water sumps to be drained on condition instead of on a schedule. In addition, electromagnetic properties of the fluid can be determined, such as the dielectric constant, which can be used to identify mis-fueling situations, contaminants in the fluid, and potentially other fluid health properties.
This paper details the work of the authors in utilizing TDR technology for making advanced measurement of fluid properties for IVHM applications. This includes water and ice measurement in fuel, determining mis-fueling and contaminants, as well as in-situ measurement of other electromagnetic properties of fluids. The results show that TDR technology is suitable for a dual/purpose sensor providing normal fluid level measurement and diagnostics information for IVHM.
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Citation
Geisheimer, J., Wabs, M., and Carvalho, C., "Using Time Domain Reflectometry to Measure Fluid Properties for IVHM Applications," SAE Technical Paper 2015-01-2593, 2015, https://doi.org/10.4271/2015-01-2593.Also In
References
- Langton , Roy , Chuck Clark , Martin Hewitt , and Lonnie Richards Aircraft fuel systems John Wiley & Sons, Ltd 2009
- Technical Standard Order: Fuel and Oil Quality Instruments TSO-C55a Federal Aviation Administration June 2007
- World Fuel Sampling Program Coordinating Research Council, Inc. Report No. 647 2006
- Vass , Gabor The Principles of Level Measurement RF capacitance, conductance, hydrostatic tank gauging, radar, and ultrasonics are the leading sensor technologies in liquid level tank measurement and control operations Sensors 17 10 55 64
- Azevedo , Stephen , and Thomas E. McEwan Micropower impulse radar Science and Technology Review 1996
- Lavon , Ronie , Carlos Eduardo Carvalho , Thomas Miskell , Vincent Rizzo , and Kevin John Petriel System and method for accurately measuring fluid level in a vessel U.S. Patent Application 12/243,511 October 1 2008
- Advisory Circular: Fuel Tank Ignition Source Prevention Guidelines AC No: 25.981-1C Federal Aviation Administration September 2008
- British Airways Flight 38 http://en.wikipedia.org/wiki/British_Airways_Flight_38