Location

Brunswick, ME

Start Date

1-1-1990 12:00 AM

Description

Honeycomb structures are often used because they are light in weight, yet able to bear large pressure loads. Because weight is such a major consideration in the aerospace industry, honeycomb is used in many non-load bearing structures such as control surfaces, access doors, floors, and speed brakes. As may be expected in a complicated structure, there are many possibilities for defects or damage to be induced into these parts, both during the fabrication process and while the part is in service. The presence of these defects necessitate that honeycomb structures be inspected. Film radiography is often used as the primary inspection technique for honeycomb. Alternatively, real time imaging is a filmless radiographic inspection technique which has speed and arbitrary orientation of the sample as its primary advantage. This technique has not been widely used, primarily because of poor image quality. The first point is poor spatial resolution, and the second is poor contrast sensitivity, as compared to film. When a microfocus x-ray source is used in conjunction with a real time system, the result is a marked improvement of the image resolution. The use of image processing can significantly improve the contrast sensitivity. The result is a real time system with resolution equivalent to the present film inspection techniques thus allowing for quicker and less costly inspections, so long a the sensitivity requirements are not too stringent.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

9B

Chapter

Chapter 7: Engineered Materials

Section

Defects in Composites

Pages

1549-1555

DOI

10.1007/978-1-4684-5772-8_199

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Real Time X-Ray Microfocus Inspection of Honeycomb

Brunswick, ME

Honeycomb structures are often used because they are light in weight, yet able to bear large pressure loads. Because weight is such a major consideration in the aerospace industry, honeycomb is used in many non-load bearing structures such as control surfaces, access doors, floors, and speed brakes. As may be expected in a complicated structure, there are many possibilities for defects or damage to be induced into these parts, both during the fabrication process and while the part is in service. The presence of these defects necessitate that honeycomb structures be inspected. Film radiography is often used as the primary inspection technique for honeycomb. Alternatively, real time imaging is a filmless radiographic inspection technique which has speed and arbitrary orientation of the sample as its primary advantage. This technique has not been widely used, primarily because of poor image quality. The first point is poor spatial resolution, and the second is poor contrast sensitivity, as compared to film. When a microfocus x-ray source is used in conjunction with a real time system, the result is a marked improvement of the image resolution. The use of image processing can significantly improve the contrast sensitivity. The result is a real time system with resolution equivalent to the present film inspection techniques thus allowing for quicker and less costly inspections, so long a the sensitivity requirements are not too stringent.