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Review of Progress in Quantitative Nondestructive Evaluation
INTRODUCTION This paper describes the use of a microwave interferometer technique which measures the thickness of liquid shim material applied to composite surfaces. Liquid shim, which is a low dielectric material, is applied to spar cap surfaces in order to maintain wing skin mold-line tolerances while reducing stresses at the location of fastener holes. For this application, the thickness of the shim material must be controlled within specified limits. Microwave reflection techniques providedoi:10.1007/978-1-4615-2848-7_251 fatcat:g3cozs652rclthiwhw3l5djgoq