Location

La Jolla, CA

Start Date

1-1-1993 12:00 AM

Description

Integrated polar backscatter has been shown to have potential applications to composites, especially for the detection of matrix cracking, delaminations, fiber waviness, fiber fracture, inclusions and porosity [1–11]. The method was attractive because it avoided several measurement limitations inherent to conventional pulse echo techniques. Polar backscatter, however, has not been without its disadvantages. It has been reported that surface texture introduces unwanted artifacts in images made using the polar backscatter method [12]. One suggested method to overcome this limitation was the use of stripable coatings, which are paints that approximately match the impedance of the composite surface and have the effect of physically “smoothing” the surface impressions away [13]. After ultrasonic testing, these paints can be removed, but this method entails additional part handling and increases the cost of production.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

12B

Chapter

Chapter 6: Material Properties

Section

Ceramics and Semiconductors

Pages

1799-1806

DOI

10.1007/978-1-4615-2848-7_230

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Measured Effects of Surface Cloth Impressions on Polar Backscatter and Comparison with a Reflection Grating Model

La Jolla, CA

Integrated polar backscatter has been shown to have potential applications to composites, especially for the detection of matrix cracking, delaminations, fiber waviness, fiber fracture, inclusions and porosity [1–11]. The method was attractive because it avoided several measurement limitations inherent to conventional pulse echo techniques. Polar backscatter, however, has not been without its disadvantages. It has been reported that surface texture introduces unwanted artifacts in images made using the polar backscatter method [12]. One suggested method to overcome this limitation was the use of stripable coatings, which are paints that approximately match the impedance of the composite surface and have the effect of physically “smoothing” the surface impressions away [13]. After ultrasonic testing, these paints can be removed, but this method entails additional part handling and increases the cost of production.