" High Bandwith Laser Heterodyne Interferometer To Measure Transient Mechanical Displacements "

Lesne, J. L.; Brun, Alain; Royer, D.; Dieulesaint, E.

doi:10.1117/12.943479

Cited by 5 publications

(3 citation statements)

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“…Typically, the SAW velocities curves shown in Figure 3 are expected to be symmetric around 90° [13,16,17]. However, in experiments, there are several factors that may cause errors, such as: (1) the For sample 6, which was in the nucleation stage (start of recrystallization), the SAW velocity varies between 2978 m/s and 3031 m/s (difference of 53 m/s), the highest SAW velocity was in the rolling direction and the lowest SAW velocity was in the 85-90 • .…”

Section: Angular Dependence Of the Saw Velocitymentioning

confidence: 99%

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Characterization of Texture Evolution during Recrystallization by Laser-Induced Transient Thermal Grating Method

Yin

Zhang

et al. 2019

Metals

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The analyses of texture evolution of cold rolled interstitial free (IF) steel sheets during annealing and recrystallization are presented, in which the dispersion curves of surface acoustic waves (SAW) excited by laser-induced transient thermal grating method are measured. The results show that the angular anisotropy of the SAW velocity changes due to the texture changes at different stages of recrystallization. The theoretically simulated angular dispersion of SAW velocity within individual crystal revealed that the change of SAW velocity is closely related to recrystallization texture evolution. A model for the angular dependence of the SAW velocity in textured polycrystalline IF steel with different oriented crystals is presented and the simulations are yielded, which show that the results agree with those of experiments.

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Section: Angular Dependence Of the Saw Velocitymentioning

confidence: 99%

“…Typically, the SAW velocities curves shown in Figure 3 are expected to be symmetric around 90 • [13,16,17]. However, in experiments, there are several factors that may cause errors, such as: (1) the measured samples were cut to small pieces from rolled coils.…”

Section: Angular Dependence Of the Saw Velocitymentioning

confidence: 99%

Characterization of Texture Evolution during Recrystallization by Laser-Induced Transient Thermal Grating Method

Yin

Zhang

et al. 2019

Metals

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“…In the heterodyne method (HM), the intensity measurements are replaced by phaseincrement measurements in the temporal domain, for each point in the pattern. To this end, one introduces a temporal carrier into the phase, ranging from hundreds of kilohertz (Kreis 1993, Massie et al 1979 to tens of megahertz (Lesne et al 1987). In interferometric techniques, this difference is obtained via a frequency shift in one or both wavefronts, by using, for example, Bragg cells (Massie 1980), rotating polarizing components (Rosenbluth and Bobroff 1990) and the transversal (Toyooka et al 1984) or rotational (Barnes 1987) movement of a grating.…”

Section: Phase-locked Interferometrymentioning

confidence: 99%

Phase-evaluation methods in whole-field optical measurement techniques

Dorrio

Fernández

1999

Meas. Sci. Technol.

137

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Many optical measurement techniques provide fringe patterns as their results. The decodification processes that employ one or several fringe patterns to automatically retrieve the phase are generally designated as phase-evaluation methods. In this work, an overview of these methods will be schematically presented. Their particular performances will be compared, stressing their main advantages and drawbacks. An important group of these methods employs the well-known phase-shifting algorithms as a tool for calculating the phase. In the general form of these algorithms, the principal value of the optical phase is computed by an inverse trigonometric function whose argument is a combination of phase-shifted intensity values, provided by the modulation of one or several fringe patterns. These algorithms will be also studied in the general context of the phase-evaluation methods.

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The Use of a Contactless Ultrasonic Method for Evaluating Grain Size in Steel Sheets

Brun¹,

Lesne²,

Cassier

et al. 1989

Nondestructive Characterization of Materials

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" High Bandwith Laser Heterodyne Interferometer To Measure Transient Mechanical Displacements "

Cited by 5 publications

References 0 publications

Characterization of Texture Evolution during Recrystallization by Laser-Induced Transient Thermal Grating Method

Characterization of Texture Evolution during Recrystallization by Laser-Induced Transient Thermal Grating Method

Phase-evaluation methods in whole-field optical measurement techniques

The Use of a Contactless Ultrasonic Method for Evaluating Grain Size in Steel Sheets

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