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Measurement of Fastener Head Protrusion in Automated Systems with a Capacitive Sensor
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English
Abstract
A capacitance sensor has been developed for measuring the protrusion of fastener heads. The capacitance sensor is easily integrated into an automated rivet installation system. The sensor is capable of measuring the protrusion of a fastener head relative to the skin surface, even in the presence of corrosion protective films used on the aircraft skin surface during manufacture.
This paper presents a brief review of the capacitance measurement method. The mechanical design and operation of the sensor are presented as well as information regarding the integration of the sensor within an automated riveting system.
Another novel capacitance-based inspection system has been developed for characterization of critical fastener dimensions. Design, capabilities, and inspection data obtained with the fastener measurement system are presented.
A Capacitance Measurement System for the inspection of fastener hole quality has been used by numerous aerospace manufacturers and end users for over a decade. The two new sensors discussed in this paper utilize the same electronics and operating principles of the hole inspection system to solve new measurement requirements as the needs for Statistical Process Control data evolve.
Authors
Citation
Semones, T., "Measurement of Fastener Head Protrusion in Automated Systems with a Capacitive Sensor," SAE Technical Paper 931771, 1993, https://doi.org/10.4271/931771.Also In
References
- Lewis W.H. Gibson H.S. “Capacitance technique for quantitive inspection of fastener holes - A new NDE technology” 1981 Fall Nat. Conf., American Society for Nondestructive Testing Atlanta, GA 1981
- Hammond J. L. Glidwell S.R. “Design of Algorithms to Extract Data from Capacitance Sensors to Measure Fastener Hole Profiles” IEEE Transactions on Instrumentation and Measurement IM-32 2 June 1983
- Gibson H.S. Goodman P.E. Glidwell S.R. Lewis W.H. “Fastener hole inspection for new aircraft: Capacitance hole probe system” Final Report AFWAL-TR-82-4041, AFWAL/MLTM Wright-Patterson AFB Ohio 45433 133 158 May 1982