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  • 1
    Electronic Resource
    Electronic Resource
    Separation of thermal wave induced displacements and thermoreflectance variations using a rotated beamsplitter cube interferometer (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3853-3859 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A rotated beamsplitter cube interferometer has been developed which can measure both the change in reflectivity and the displacement of nontransparent thin films caused by thermal waves. Thermal waves are used to characterize material properties, especially those of thin films, by monitoring the heat propagation in a specimen. Thermal waves cause both a change in the reflectivity of the specimen and a displacement of the specimen surface. By varying the phase difference between the reference and signal arms of an interferometer, a method for detecting and separating the contributions of each of these effects has been developed. This enables the determination of the thermal expansion coefficient of the thin film independent of substrate properties. Data demonstrating the application of this technique on Cu and TiN thin films are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289677
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  • 2
    Electronic Resource
    Electronic Resource
    Fiber optic sensors for use in monitoring flow front in vacuum resin transfer molding processes (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2156-2157 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A distributed fiber optic sensor array developed for use in vacuum resin transfer molding systems is described. The sensor is placed in the mold and can be used to monitor resin infiltration even in complicated parts because of its small size and flexibility. The sensor components themselves are low cost and become incorporated in the part during the molding process. Careful design of the sensor elements is necessary to avoid sensitivity to mechanical stresses associated with the resin infiltration process. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148065
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of diffuse interfaces using time-resolved acoustic spectroscopy (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 861-867 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical and experimental investigation is conducted on the frequency-dependent reflectivity of ultrashort acoustic elastic waves from a diffuse interface. One-dimensional theoretical predictions are obtained from a transfer-matrix representation of the extended diffusional interface. Experimental results are obtained with time-resolved thermal and acoustic spectroscopy applied to a sputter-deposited two-layer thin film sample of aluminum and gold on a glass substrate. For the first time, variations in the spectral character of reflected acoustic waves, as measured with time-resolved spectroscopy, are quantified using the transfer function between successive arrivals at the free surface. This transfer function is used as a basis for quantitatively determining the nanometer sized extent of a diffuse interface. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369204
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  • 4
    Electronic Resource
    Electronic Resource
    Generation of narrow-band ultrasound with a long cavity mode-locked Nd:YAG laser (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2390-2392 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A passively mode-locked, flashlamp-pumped Nd:YAG laser with a cavity length of 11.19 m has been developed to study the noncontact generation of narrow-band ultrasound. The individual mode-locked pulses acted as separate sources of ultrasound, producing a train of acoustic pulses with a repetition rate of about 13.4 MHz. The ultrasound was generated in an aluminum sample and remotely detected with a path stabilized Michelson interferometer. The energy in the multiple pulse acoustic signal was confined to a considerably reduced spectral range compared with that in a single pulse.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102925
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  • 5
    Electronic Resource
    Electronic Resource
    Optical sensing of in-plane ultrasonic transients (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1043-1044 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An optical sensor has been developed, based on the differential laser Doppler anemometer, for the detection of in-plane ultrasonic transients. Ultrasonic pulse propagation around a 90° corner has been investigated in an aluminum block. By generating ultrasonic pulses on diametrically opposite sides of the detector a polarity inversion of the ultrasonic pulses detected is demonstrated. The results obtained are as expected for the case of in-plane displacement measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100060
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  • 6
    Electronic Resource
    Electronic Resource
    Quantitative theory for laser ultrasonic waves in a thin plate (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1882-1884 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical inversion of the Hankel–Laplace transform has been performed for the case of ultrasonic displacements in an infinite, homogeneous, isotropic plate which is excited thermoelastically by a laser pulse. Values for the elastic moduli and the plate thickness may be extracted when the calculated displacements are compared directly to those obtained experimentally. Previous authors have demonstrated methods for determining the elastic modulus in thick plates; this letter shows that using a different method for the development of the theory allows similar modulus determinations to be made for thin as well as thick plates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103999
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of the flexural modulus of thin films from measurement of the first arrival of the symmetric Lamb wave (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1544-1546 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A technique is presented to measure the flexural modulus of free-standing thin metallic films from 1 to 25 μm thick. Lamb waves are excited in the film with a pulsed Nd:YAG laser, and detected using heterodyne interferometry. Variability in wave-form structure is observed as a function of experimental parameters and film thickness. The first arrival of the symmetric Lamb mode can be unambiguously identified regardless of wave-form shape, and is used to calculate the flexural modulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106277
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  • 8
    Electronic Resource
    Electronic Resource
    Projection of improved high rate discharge performance for homogenized cathode Li/I2 (P2VP) batteries (1992)
    Springer
    Journal of applied electrochemistry 22 (1992), S. 99-103 
    Details
    ISSN: 1572-8838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract It has been recently proposed that implementing a cathode with a homogeneous distribution of iodine and P2VP into Li/I2 (P2VP) batteries would be a means of enhancing high rate discharge performance. A procedure for predicting high rate discharge performance gains for such cells is presented. The projected high rate discharge performance for cells with homogeneous cathodes is superior to the performance of conventional cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01023810
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  • 9
    Electronic Resource
    Electronic Resource
    Preface (1989)
    Springer
    Journal of nondestructive evaluation 8 (1989), S. 53-54 
    Details
    ISSN: 1573-4862
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00565630
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  • 10
    Electronic Resource
    Electronic Resource
    Laser speckle decorrelation as a noncontact method for brittle-ductile fracture differentiation (1991)
    Springer
    Experimental mechanics 31 (1991), S. 8-13 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Quasi-static fracture in four-point-bend specimens of both brittle and ductile materials was examined using a method which required only photographic access to the specimen surface. Decorrelation of laser speckle patterns was used as a means to map out two-dimensional regions of high surface strain associated with crack propagation. ASTM A515 grade 70 steel was tested, at temperatures above and below its brittle-ductile transition temperature, by double-exposure speckle photography of the area ahead of the crack tip. The regions where the two speckle patterns were uncorrelated, determined by pointwise spatial filtering of the speckle interferograms, have been observed and are related to plastic deformation of the specimen surface near the crack tip. A subsequent comparison of the decorrelation zones resulting from brittle versus ductile states showed differences as expected in both zone size and shape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02325716
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