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  • 1
    Electronic Resource
    Electronic Resource
    Nanosecond scale optical pulse separations in double-exposure holographic interferometry for investigation of transient events (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2883-2885 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: To investigate shock wave propagation in air, optical pulses with temporal separations ranging from 53 to 425 ns have been generated for use in double-exposure pulsed holography using a White cell [J. U. White, J. Opt. Soc. Am. 32, 285 (1942)] as an optical delay element. A single optical pulse from a Q-switched Nd:YAG laser was split using polarizing optics so that one pulse was guided directly to the experimental holographic recording setup; the other pulse was sent first into the White cell, emerging a set number of nanoseconds later. This delayed pulse then was used to record a second holographic exposure. Using the White cell construction, reproducible pulse separations between 53 and 425 ns could be generated. Shock wavefronts propagating at velocities greater than Mach 20 have been recorded using this method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104736
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Voltage-controlled acousto-optic phase shifter (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 2390-2392 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel solid-state technique for effecting a phase shift in a light beam has been developed utilizing a voltage-controlled rf phase shifter and two acousto-optic modulators. The acousto-optic phase-shifting technique provides a simple and accurate method of phase stepping, and is a solid-state alternative to conventional mechanical piezoelectric pusher techniques. Accuracy and repeatability of the prototype system were better than 1°. The technique lends itself quite well to situations where both heterodyne and quasi-heterodyne techniques are used for interferometric analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139915
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Transient Lamb wave velocity determination using holographic mapping of spatial features of propagating waves (1989)
    Springer
    Research in nondestructive evaluation 1 (1989), S. 151-166 
    Details
    ISSN: 1432-2110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A holographic technique to determine empirically group velocities of transient anti-symmetric Lamb waves using only spatial features of the propagating waveform has been shown to be in good agreement with predicted results from the elastic theory dispersion relationships for thin plates. The holographic technique uses only spatial features of the propagating waveforms for determination of group velocity, i.e., no absolute amplitude information is necessary. The technique has been applied successfully to materials of different elastic properties and thickness, using the same measurement criterion for each sample. The spatial mapping of transient Lamb waves in plates using full field holographic techniques promises to be both an excellent tool in the characterization of engineering materials, and a means of interrogating composite structures for sub-surface defects, delaminations, and gross anisotropy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01606512
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    Paper (German National Licenses)
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