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Digitale Medien

Acoustic microscope based on magneto-elastic wave phase conjugator (2000)

Brysev, A. ; Krutyansky, L. ; Pernod, P. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 76 (2000), S. 3133-3135

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Acoustic C-scan imaging (acoustic microscopy) by means of supercritical parametric wave phase conjugation (WPC) is studied experimentally. A phase conjugator based on a magneto-acoustic active material is used for compensating phase distortions introduced by solid and polymer aberration layers covering objects (electronic integrated circuits as examples). Improvement of images is demonstrated on an acoustic microscope, operating at a frequency of 10 MHz. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.126547

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2

Digitale Medien

Parametric phase conjugation of a wide-band acoustic pulse in supercritical mode (2000)

Pernod, P. ; Preobrazhensky, V.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 76 (2000), S. 387-389

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Parametric wave phase conjugation of wide-band ultrasonic pulses of 100% relative bandwidth is demonstrated. The giant amplification allowed by the supercritical mode of the magnetoacoustic technique used, leads to a relatively high efficiency of the conjugation process. In addition, the pulse response function of the magnetoacoustic conjugator in supercritical mode is derived by fitting the experimental results with the linear theory of phase conjugation. The latter provides the parameters that define the maximum value of acoustic power in the conjugate wave. The results are of interest for applications in nondestructive evaluation and acoustical imaging. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.125762

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3

Digitale Medien

Acoustic imaging by second harmonic of phase-conjugate wave in inhomogeneous medium (2001)

Pyl'nov, Yu. ; Pernod, P. ; Preobrazhensky, V.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 78 (2001), S. 553-555

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Application of the supercritical magnetoelastic wave phase conjugation to harmonic imaging in acoustic C-scan microscopy is demonstrated. Second-harmonic generation by phase-conjugate wave is used for improvement of resolution of an imaging system. Possibility to compensate phase aberrations introduced in harmonic image by inhomogeneity of propagation medium is shown experimentally and explained theoretically. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1342205

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