Aircraft Wiring Integrity Verification using Pseudo-Random Binary Sequence
Department of Transportation
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Small Business Information
Intelligent Automation, Inc
7519 Standish Place, suite 200, Rockville, MD, 20855
Socially and Economically Disadvantaged:
AbstractOur approach to aircraft wiring inspection is to inject a special type of low level probe signal into the cable to be tested. The system response to this special input can be used to give the complete transfer function of the cable. Incipient failures in the cable will be detectable as subtle changes in that transfer function, or cross-correlation between probe input signal and response, including discontinuities which cause signal reflections and hence standing waves. Even very low probe signals can be used, and the test can be done on-line while the circuit is doing its normal function. The required electronics can be fabricated into a low-cost single chip which would be built into the system or even built into the connector. In this mode, the probe signal and test would be executing continuously. Alternatively, the approach can be used offline. Since very low level probe signals can be used, in many cases these signals can be induced into the cable and measured without disconnecting the cable. We have been able to detect chafing, fouling, carbonization of insulation shorts and open faults. Prototype hardware will be validated against a array of well-characterized wiring samples and systems prepared by our partner Raytheon and those available at the Sandia National Laboratory Aircraft Wiring Test bed.
* information listed above is at the time of submission.