Location

La Jolla, CA

Start Date

1-1-1993 12:00 AM

Description

We have developed a system that uses multiple radiographic views and modern survey instruments to determine the locations and sizes of hidden objects. The survey instrument is a total station that combines a transit for angle measurements and a range finder for determining the exact locations of the film plane and radiographic source for each radiographic view. This information coupled with the location of an object’s image on the film defines a line in three-dimensional space. Using two or more views, we locate the object by finding the intersection of these lines. Because of experimental error in each survey measurement, the lines may not intersect, but we use the point of nearest approach. Experience with the system has shown that we can locate objects to within a 5-mm cube and determine the sizes of objects to better than 1 mm.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

12B

Chapter

Chapter 9: Systems, Process Control, and Reliability

Pages

2309-2316

DOI

10.1007/978-1-4615-2848-7_292

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Three-Dimensional Measurement System

La Jolla, CA

We have developed a system that uses multiple radiographic views and modern survey instruments to determine the locations and sizes of hidden objects. The survey instrument is a total station that combines a transit for angle measurements and a range finder for determining the exact locations of the film plane and radiographic source for each radiographic view. This information coupled with the location of an object’s image on the film defines a line in three-dimensional space. Using two or more views, we locate the object by finding the intersection of these lines. Because of experimental error in each survey measurement, the lines may not intersect, but we use the point of nearest approach. Experience with the system has shown that we can locate objects to within a 5-mm cube and determine the sizes of objects to better than 1 mm.