Optical detection of ultrasound on rough surfaces by a phase-conjugate method

Nakano, H.; Matsuda, Youichi; Shin, Seung-Ho; Nagai, Satoshi

doi:10.1016/0041-624x(95)00039-6

Cited by 21 publications

(13 citation statements)

References 13 publications

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“…However, in contrast to the TWM approach, the DPCMprocessed optical beams can be made planar, and free of phase and intensity variations which, in principle, can improve the signal-to-noise by an additional 3 dB. This DPCM scheme was recently demonstrated by several groups independently, using either heterodyne [12,13] or homodyne [14] detection techniques, with similar qualitative results.…”

Section: Introductionmentioning

confidence: 54%

Materials inspection and process control using compensated laser ultrasound evaluation (CLUE): demonstration of a low-cost laser ultrasonic sensor

Pepper¹,

Dunning²,

Mitchell³

et al. 1996

Lasers as Tools for Manufacturing of Durable Goods and Microelectronics

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We demonstrate the use of a nonsteady-state photo-inducedemf adaptive photodetector as a robust, low-cost laser ultrasonic sensor. This class of sensor enables high-fractional bandwidth ultrasound detection and, in addition, all-optical compensation of adverse in-factory noise, including vibration, speckle, relative platform motion, and optical fiber modal dispersion. Reference-beam and fiber-based time-delay interferometric configurations were demonstrated, as well as the ue of a diode laser as a compact optical probe. IntroductionThere is a great need in the manufacturing, aerospace (e.g., critical components, aging aircrafi), commercial, energy, automotive, microelectronics and DoD communities for diagnostic systems that can improve the efficiency, yield, and performance of various (laser-based) material processing operations -while reducing cost, labor, scrap, and machine downtime. Such needs

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Section: Introductionmentioning

confidence: 54%

Materials inspection and process control using compensated laser ultrasound evaluation (CLUE): demonstration of a low-cost laser ultrasonic sensor

Pepper¹,

Dunning²,

Mitchell³

et al. 1996

Lasers as Tools for Manufacturing of Durable Goods and Microelectronics

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show abstract

“…This was one of the reasons for considering active or adaptive holographic interferometers. Among different possibilities, double phase conjugation, [7][8][9] non-steady-state photoelectromotive force, 10 and photorefractive beam combiner, [11][12][13][14][15][16] we analyzed and developed this later technique that seems to us as the most promising.…”

Section: Introductionmentioning

confidence: 99%

Novel theoretical aspects on photorefractive ultrasonic detection and implementation of a sensor with an optimum sensitivity

Montmorillon

Delaye

Launay

et al. 1997

Journal of Applied Physics

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We here expose theoretical and experimental results on homodyne detection using near-infrared laser sources, at 1.06, 1.32, and 1.55 m wavelengths. The used photorefractive crystals are two large size CdZnTe:V samples. With speckled beams such as the ones scattered by diffusive objects, we reach a detection limit which, at 1.55 m, is only 1.6 times above the one obtained with plane waves in a classical interferometer and only 2 and 2.2 times above at 1.32 and 1.06 m, respectively. It is then demonstrated that the electron-hole competition, which varies enormously between these three wavelengths and gives a nearly zero two-wave-mixing gain at 1.32 m, does not influence the sensitivity of the system. Moreover, we show that the frequency cutoff of the system is four times higher in the attenuation regime than in the amplification one.

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“…In this respect, one can categorize this detector as an example of a more general class of so-called "adaptive photodetectors," which provide coherent detection capabilities in the face of dynamic optical distortions of the interacting beams. We note that other classes of adaptive photodetectors have been demonstrated for use as LBU receiver elements, including double-pumped phase-conjugate mirrors [11,12,13] and photorefractive two-wave mixing schemes [14,15], both of which also employ nonlinear optical techniques to compensate for single-pass optical phase noise, such as speckle and beam wander. These approaches differ from the photo-emf scheme, in that they perform only the beam clean-up and/or wavefront-matching operations and, therefore, require a subsequent coherent-detection stage.…”

Section: The Photo-emf Detectormentioning

confidence: 99%

Characterization of the photo-EMF response for laser-based ultrasonic sensing under simulated industrial conditions

Pepper

Dunning²,

Chiao³

et al. 1998

Technical Digest. Summaries of Papers Presented at the Conference on Lasers and Electro-Optics. Conference Edition. 1998 Techni

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Optical detection of ultrasound on rough surfaces by a phase-conjugate method

Cited by 21 publications

References 13 publications

Materials inspection and process control using compensated laser ultrasound evaluation (CLUE): demonstration of a low-cost laser ultrasonic sensor

Materials inspection and process control using compensated laser ultrasound evaluation (CLUE): demonstration of a low-cost laser ultrasonic sensor

Novel theoretical aspects on photorefractive ultrasonic detection and implementation of a sensor with an optimum sensitivity

Characterization of the photo-EMF response for laser-based ultrasonic sensing under simulated industrial conditions

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