Event Title

Microwave Characterization of Glass Fiber Reinforced Polymers With a Multi-Detector Waveguide

Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

Glas fiber reinforced polymers are increasingly being used in all kinds of applications. The main reason for this is that one obtains excellent mechanical properties (e.g. strength) at an acceptable price. The optimal use is achieved only if a reliable characterization can be performed of the material and of the components made out of it. Therefore nondestructive testing methods are important. It has been shown previously that microwaves are suited for defect characterization [1–3] and for the determination both of fiber content and orientation [4,5]. A detector arrangement with 4 detectors located along a rectangular waveguide responds to the refractive index and to the attenuation of the material at microwave frequencies. Therefore it has been used for defect characterization [6,7], and it is also applicable to determine fiber content: Figure 1 shows how phase and amplitude derived from the signals of the 4 detectors depends on fiber content.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18A

Chapter

Chapter 2: Electromagnetic, Thermal, and X-Ray Techniques

Section

Microwave NDE

Pages

555-560

DOI

10.1007/978-1-4615-4791-4_70

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Microwave Characterization of Glass Fiber Reinforced Polymers With a Multi-Detector Waveguide

Snowbird, UT, USA

Glas fiber reinforced polymers are increasingly being used in all kinds of applications. The main reason for this is that one obtains excellent mechanical properties (e.g. strength) at an acceptable price. The optimal use is achieved only if a reliable characterization can be performed of the material and of the components made out of it. Therefore nondestructive testing methods are important. It has been shown previously that microwaves are suited for defect characterization [1–3] and for the determination both of fiber content and orientation [4,5]. A detector arrangement with 4 detectors located along a rectangular waveguide responds to the refractive index and to the attenuation of the material at microwave frequencies. Therefore it has been used for defect characterization [6,7], and it is also applicable to determine fiber content: Figure 1 shows how phase and amplitude derived from the signals of the 4 detectors depends on fiber content.