Location

Seattle, WA

Start Date

1-1-1996 12:00 AM

Description

Spread-Spectrum Ultrasonic Evaluation (SSUE) is an emerging technology for the global testing of structures and materials [1]. It incorporates the correlation properties of pseudo-random signals into ultrasonic NDE using spread-spectrum technology. The SSUE instrument records the ultrasonic correlation signature that is representation of the aggregate acoustic state of the test sample. The measured ultrasonic correlation signature is used for the detection of changes in the acoustic state of the test object. One major advantage of the SSUE technique is that it provides a global inspection of the material or structure without scanning. Some examples of unique SSUE applications are when; 1) the test object is of complex geometry or too large for scanning or, 2) the test material is a highly attenuative material such as concrete, wood, or composites. This paper reports the progress in applying the SSUE technique to concrete. The aim of the reported research is to study the propagation of the spread-spectrum signal in concrete structures of various sizes and determine the sensitivity of the SSUE correlation signature to changes in the various acoustic properties of the concrete object. A comparison of the SSUE technique with conventional ultrasonic NDE techniques for concrete testing is done and advantages of this technique for standard concrete inspection methods are discussed.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

15B

Chapter

Chapter 7: Infrastructure

Section

Concrete Structures

Pages

1771-1778

DOI

10.1007/978-1-4613-0383-1_231

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Application of Spread-Spectrum Ultrasonic Evaluation to Concrete Structures

Seattle, WA

Spread-Spectrum Ultrasonic Evaluation (SSUE) is an emerging technology for the global testing of structures and materials [1]. It incorporates the correlation properties of pseudo-random signals into ultrasonic NDE using spread-spectrum technology. The SSUE instrument records the ultrasonic correlation signature that is representation of the aggregate acoustic state of the test sample. The measured ultrasonic correlation signature is used for the detection of changes in the acoustic state of the test object. One major advantage of the SSUE technique is that it provides a global inspection of the material or structure without scanning. Some examples of unique SSUE applications are when; 1) the test object is of complex geometry or too large for scanning or, 2) the test material is a highly attenuative material such as concrete, wood, or composites. This paper reports the progress in applying the SSUE technique to concrete. The aim of the reported research is to study the propagation of the spread-spectrum signal in concrete structures of various sizes and determine the sensitivity of the SSUE correlation signature to changes in the various acoustic properties of the concrete object. A comparison of the SSUE technique with conventional ultrasonic NDE techniques for concrete testing is done and advantages of this technique for standard concrete inspection methods are discussed.