Location

La Jolla, CA

Start Date

1-1-1993 12:00 AM

Description

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 provide an alternative nondestructive approach to liquid shim thickness measurements.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

12B

Chapter

Chapter 6: Material Properties

Section

Thin Films and Coatings

Pages

1955-1962

DOI

10.1007/978-1-4615-2848-7_250

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Evaluation of Microwave Methods for Thickness Measurements of Liquid Shim Material

La Jolla, CA

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 provide an alternative nondestructive approach to liquid shim thickness measurements.