Fiber optic sensing for ultrasonic NDE

Dudderar, T. D.; Bürger, Christian; Gilbert, John A.; Smith, James A.; Peters, Bruce R.

doi:10.1007/bf00568009

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…These so-called heterodyne techniques will be discussed thoroughly in the next section. For ease of alignment and convenience of use, many fiber-optic base homodyne systems have been implemented as well (Claus and Cantrell, 1980;Bowers, 1982;Garg and Claus, 1983;Drake and Leiner, 1984;Dudderar et a/., 1987). The stabilized interferometer shown in Fig. 14 is arranged in a Fizeau configuration, so that the reference and object beams share a great deal of common path.…”

Section: Path Stabilized Interferometrymentioning

confidence: 99%

Optical Detection of Ultrasound

Wagner

1990

Physical Acoustics

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Section: Path Stabilized Interferometrymentioning

confidence: 99%

Optical Detection of Ultrasound

Wagner

1990

Physical Acoustics

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“…17 Furthermore, the flexibility and miniature size of the optical fiber can improve the ability of the interferometer to access areas that are difficult to examine with standard optics. 18,19 Different designs of optical fiber interferometers ͑OFIs͒, such as Fabry-Perot 20 and Sagnac, 21 have been demonstrated, but they require excessive auxiliary components such as fiber pig-tailed microlenses, phase modulators, and polarization controllers to optimize performance. In this study a simplified OFI that is easy to implement and control for high-frequency SAW measurements with minimum supporting components is described.…”

Section: Introductionmentioning

confidence: 99%

Noncontact, nondestructive elasticity evaluation of sound and demineralized human dental enamel using a laser ultrasonic surface wave dispersion technique

et al. 2009

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Laser ultrasonic nondestructive evaluation (NDE) methods have been proposed to replace conventional in vivo dental clinical diagnosis tools that are either destructive or incapable of quantifying the elasticity of human dental enamel. In this work, a laser NDE system that can perform remote measurements on samples of small dimensions is presented. A focused laser line source is used to generate broadband surface acoustic wave impulses that are detected with a simplified optical fiber interferometer. The measured surface wave velocity dispersion spectrum is in turn used to characterize the elasticity of the specimen. The NDE system and the analysis technique are validated with measurements of different metal structures and then applied to evaluate human dental enamel. Artificial lesions are prepared on the samples to simulate different states of enamel elasticity. Measurement results for both sound and lesioned regions, as well as lesions of different severity, are clearly distinguishable from each other and fit well with physical expectations and theoretical value. This is the first time, to the best of our knowledge, that a laser-based surface wave velocity dispersion technique is successfully applied on human dental enamel, demonstrating the potential for noncontact, nondestructive in vivo detection of the development of carious lesions.

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Laser-induced stress wave thermometry applied to silicon wafer processing: Modeling and experimentation

Rabroker

Suh

Chona

2005

Experimental Mechanics

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ABSTRACT--We present a methodology correlating the group velocity of guided plate waves to temperature in anisotropic silicon substrate. The model is developed through numerical solution and manipulation of the dispersion relations, while elastic constants and plate thickness are treated as functions of temperature. Analytical results demonstrate that adequate thermal resolution is provided by both the lowest-order antisymmetric and symmetric dispersive Lamb wave modes to serve as an effective diagnostic in a noncontact thermometry scheme applicable during rapid thermal processing of silicon wafers. Validation is made through a combination of experimentation using laser-generated ultrasound in silicon wafers and analysis employing the Gabor wavelet transform to extract frequency-and temperaturedependent group velocities from the dispersive Lamb waves.

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Fiber optic sensing for ultrasonic NDE

Cited by 10 publications

References 13 publications

Optical Detection of Ultrasound

Optical Detection of Ultrasound

Noncontact, nondestructive elasticity evaluation of sound and demineralized human dental enamel using a laser ultrasonic surface wave dispersion technique

Laser-induced stress wave thermometry applied to silicon wafer processing: Modeling and experimentation

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