Location

La Jolla, CA

Start Date

1-1-1993 12:00 PM

Description

Laser ultrasound for NDE applications is reported in several places within this Review. Interest in the subject remains high, even though the cost of associated instrumentation remains high. Benefits associated with optical probing of a sample include potentially high spatial resolution, truly non-contacting transduction permitting non-contact C-scan inspection systems, and the possibility of probing structures having awkward surface shapes. Non-contact imaging systems were first reported at an earlier review [1]. Images of defects in carbon-fiber composite samples have been demonstrated in both reflection mode and more recently in transmission mode [2]. In all cases, such experiments have been conducted using a Fabry-Perot interferometer scheme as the basis for ultrasonic detection. Such schemes use bulky and expensive lasers, leading to an impetus to examine other forms of interferometers. For portability, fiber-optic schemes provide such a possibility.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

12A

Chapter

Chapter 2: Emerging Inspection Technologies

Section

Laser-Based Ultrasonics

Pages

587-594

DOI

10.1007/978-1-4615-2848-7_74

Language

en

File Format

application/pdf

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Jan 1st, 12:00 PM

An actively-stabilized fiber-optic interferometer for laser-ultrasonic flaw detection

La Jolla, CA

Laser ultrasound for NDE applications is reported in several places within this Review. Interest in the subject remains high, even though the cost of associated instrumentation remains high. Benefits associated with optical probing of a sample include potentially high spatial resolution, truly non-contacting transduction permitting non-contact C-scan inspection systems, and the possibility of probing structures having awkward surface shapes. Non-contact imaging systems were first reported at an earlier review [1]. Images of defects in carbon-fiber composite samples have been demonstrated in both reflection mode and more recently in transmission mode [2]. In all cases, such experiments have been conducted using a Fabry-Perot interferometer scheme as the basis for ultrasonic detection. Such schemes use bulky and expensive lasers, leading to an impetus to examine other forms of interferometers. For portability, fiber-optic schemes provide such a possibility.