Interferometric detection of ultrasound at rough surfaces using optical phase conjugation

Paul, M.; Betz, B.; Arnold, W.

doi:10.1063/1.97783

Cited by 70 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…But like other teams [22,23,24,25] involved with measurement of ultrasonic displacements, we favour optical heterodyne detection because it does not require any active feedback system and reaches high sensitivity limited ultimately by quantum noise. Figure 4 shows a scheme of our compact optical interferometer issued from a modified Mach Zehnder interferometer": one arm includes the frequency shifting by means ofan acousto-optical modulator, the other one is guarded from environmental perturbations by a closed path within a roof prism.…”

Section: How To Circumvent the Particular Directivity Of Laser-generamentioning

confidence: 98%

LASER GENERATION AND DETECTION OF ULTRASOUNDS: R&D ACTIVITIES AT ELECTRICITE DE FRANCE - OPUS Project

Lesne

Brun

Pons

1990

Nondestructive Testing and Evaluation

View full text Add to dashboard Cite

Section: How To Circumvent the Particular Directivity Of Laser-generamentioning

confidence: 98%

LASER GENERATION AND DETECTION OF ULTRASOUNDS: R&D ACTIVITIES AT ELECTRICITE DE FRANCE - OPUS Project

Lesne

Brun

Pons

1990

Nondestructive Testing and Evaluation

View full text Add to dashboard Cite

“…In practice, usually ultrasonic perturbations arising in the medium are used. In this case, the scattered ultrasonic waves are detected by heterodyne interferometric methods [6] or by a method based on the photoelectromotive force (photo-EMF) effect in photorefractive crystals [7].…”

mentioning

confidence: 99%

Optoacoustic diagnostics of absorbing media

2006

View full text Add to dashboard Cite

We have calculated the intensities of ultrasonic waves excited by counter-propagating light waves of different frequencies and scattered by spherical defects in absorbing isotropic media. We have analyzed the intensity of the scattered sound as a function of the scattering angle and the position of the defect relative to the entry face of the acoustic waveguide. We have shown that for hollow spherical defects, the intensity of the scattered sound tends toward zero for scattering angles close to 90 o , and for significantly smaller angles for dense inclusions.

show abstract

“…Nevertheless, this embodiment also requires active Iength stabilization. Another dass of LBU receivers use a "compensated" interferometer which removes the speckles deleterious effect by wavefront matehing [4][5][6][7][8][9][10][11][12]. The matehing is accomplished by using phase conjugation or beam cleanup.…”

Section: Theory Background On Laser-based Ultrasound Detectionmentioning

confidence: 99%

Robust Laser-Based Ultrasound Sensor Using Integrated Photo-Induced EMF Detection and Time-Delay Interferometer

Dunning

Pepper

Chiao

et al. 1997

Review of Progress in Quantitative Nondestructive Evaluation

View full text Add to dashboard Cite

INTRODUCTIONThe important benefits of quantitative nondestructive evaluation can be realized by a manufacturer if the system is fully compatible with the manufacturing environment and cost effective. In many cases an in-line real-time process control would be desirable. There have been a variety of uhrasonie inspection techniques which have successfully met the aforementioned conditions. These techniques are able to capitalize on a !arge body of established ultrasonic methods and signal analysis. However, there are environments and processes which cannot use these conventional procedures because they require the partunder inspection to be either in physical contact with the transducer, via an epoxy, gel or fluid couplant, or maintained in close proxirnity to the transducers. These requirements may not be compatible with processes in which the part is at elevated temperatures, incompatible with the fluid couplant, physically remote or moving in a manner which adversely effects the required spacing. We present a robust uhrasonie technique which can work in these environments utilizing a laser-based uhrasound sensor incorporating photoinduced emf detection and a time-delay interferometer.Laser Based Ultrasound (LBU) with its inherent long stand-off distance for the generation and reception of the uhrasonie signals, offers a means to circumvent many manufacturing constraints. Several advantages to using a laser-based approach for the reception and detection of uhrasound are mentioned in the ensuing paragraph. The standoff distance between the parts being interrogated and the Iaser exciter and receiver can be several meters. These systems can operate with high spatial resolution on irregular and rough cut machined surfaces made from a variety of materials. The uhrasound launched within the material is normal to the surface even if the Iaser excitation is incident at a non-normal angle. For many parts, a LBU system can be configured to map out the region of interest in significantly less time than a conventional squirter system. The ability to generate short and focused Iaser pulses facilitates the generation of high bandwidth uhrasonie pulses. The Iaser receiver's high fractional bandwidth enables signal analysis using the full spectral content. The Iaser can be precisely located which can Iead to high spatial resolution. With all of theses advantages, however, LBU systems have yet to make a major impact in the commercial arena because of the issues of cost effectiveness coupled with the physical constraints imposed by many manufacturing environments. We will present a laser-based detector and system which effectively addresses both of these issues.Review of Progress m Quanl!tatlve Nondestrucllve Eva/uatwn.

show abstract

Interferometric detection of ultrasound at rough surfaces using optical phase conjugation

Cited by 70 publications

References 13 publications

LASER GENERATION AND DETECTION OF ULTRASOUNDS: R&D ACTIVITIES AT ELECTRICITE DE FRANCE - OPUS Project

LASER GENERATION AND DETECTION OF ULTRASOUNDS: R&D ACTIVITIES AT ELECTRICITE DE FRANCE - OPUS Project

Optoacoustic diagnostics of absorbing media

Robust Laser-Based Ultrasound Sensor Using Integrated Photo-Induced EMF Detection and Time-Delay Interferometer

Contact Info

Product

Resources

About