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  • American Institute of Physics (AIP)  (241,959)
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  • 1
    Electronic Resource
    Electronic Resource
    Journal of Applied Physics : AIP's archival journal for significant new results in applied physics (1931)
    [S.l.] : American Institute of Physics (AIP)
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://jap.aip.org/
    URL: http://search.ebscohost.com/
    URL: http://www.bibliothek.uni-regensburg.de/ezeit/?1476463
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  • 2
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    The Theory of the Interpretation of Seismic Travel‐Time Curves in Horizontal Structures (1932)
    American Institute of Physics (AIP)
    In:  Journal of Applied Physics, 3 (6). pp. 273-295.
    Details
    Publication Date: 2020-06-11
    Description: The theory of the interpretation of seismic travel‐time curves for refracted rays in horizontal structures is treated after the manner of Herglotz‐Wiechert, under the customary assumption that the ray paths obey the laws of geometrical optics. Multiple valued travel‐time curves, discontinuous velocity functions, and the discontinuous travel‐time curves associated with a slower speed bed receive special consideration. It appears that interpretations satisfactory from the theoretical point of view may be obtained in these cases, although, experimentally, sufficiently complete data to meet the requirements of theory may often be difficult or impossible to obtain.
    Type: Article , PeerReviewed
    Format: text
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    PAPER (OCEANREP)
  • 3
    Electronic Resource
    Electronic Resource
    Measurement of small strains in a noisy environment (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1706-1711 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple technique is demonstrated for measuring strains in an electromagnetically noisy environment using electrical strain gauges. For applications in which strains are produced electromagnetically in current-carrying structures, the noise signal can be much larger than the strain signal. Furthermore, the noise signal is at precisely the same frequency as the strain signal, making standard methods of synchronous signal detection difficult. This problem has been surmounted by modulating the detection circuit sensitivity. Bridge circuit modulation has been shown to effectively decouple the strain signal from the noise, even at very low strain levels of ∼10−8 m/m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138128
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  • 4
    Electronic Resource
    Electronic Resource
    Finite difference computer simulation of two diverging electrostatic analyzers: The soft particle spectrometer and the spectrographic particle imager (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1727-1733 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have completed a finite difference computer simulation of two diverging electrostatic analyzers. In both analyzers, the deflecting plates are cylindrical surfaces which flare out from each other like two arms of a hyperbola. The analyzers are the soft particle spectrometer (SPS) and the spectrographic particle imager (SPI), which correspond, respectively, to an energy spectrometer and an energy spectrograph. The simulation consists of two steps: (1) a finite difference computation of the electrostatic potential field inside the instrument; and (2) a ray-tracing computation in which many particles are ray traced through the instrument and statistics are gathered on the particles that make it to the collecting region. In both cases, the simulation is two-dimensional, restricted to the central plane of the instrument. This limitation turns out to be unimportant because the statistics acquired during simulation agree well with experimentally acquired statistics for each instrument. In the case of SPI, the computer simulation has been used to provide information on how variation of geometric parameters affects the quantities that describe a good spectrograph.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138132
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  • 5
    Electronic Resource
    Electronic Resource
    Dual-beam laser deflection sensor (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1740-1743 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A compact, dual-beam laser deflection system was built, mainly from commercially available parts. While the detector and electronics yielded noise levels at the theoretical level for the detector, pointing instability of the laser led to an increase in noise by a factor of about 103. The dual-beam arrangement gave only a factor of about 4 improvement over the single-beam mode due to alignment and drift problems. Further improvement requires a feedback system to minimize signal arising from common-mode beam displacements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138135
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  • 6
    Electronic Resource
    Electronic Resource
    Improved timing resolution using small side-on photomultipliers in single photon counting (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1754-1758 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The time-resolution capabilities of two 28-mm-diam side-on photomultiplier tubes, Hamamatsu R928 and RCA 931-A, were studied by point illumination of the photocathode surface with the attenuated beam of a synchronously pumped dye laser (10-ps pulse width). Using the time-correlated single photon counting technique, an apparatus response of 112 ps FWHM was obtained. Contour maps giving the time shift and the width of the response were constructed as a function of the point of illumination of the photocathode surface. These data permit selection of the optimized photocathode region to be illuminated during fluorescence decay measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138089
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  • 7
    Electronic Resource
    Electronic Resource
    Infrared fluorescence "decay-time'' temperature sensor (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1784-1787 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The principle of the change in the "decay time'' of the fluorescence of a small sample of neodymium in a glass matrix, excited by infrared radiation from a high-power light emitting diode has been used in the construction of a fiber-optic temperature sensor. Such a device is an inexpensive transducer and has demonstrated a fiber-optic sensor not requiring referencing to the intensity of the exciting radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138094
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  • 8
    Electronic Resource
    Electronic Resource
    Fully automated apparatus to measure the thermal conductivity of liquids by the transient hot-wire method (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1788-1794 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new fully automated apparatus for measuring the thermal conductivity of liquids is described. This apparatus has been developed to meet the needs of industrial applications. The principle of the measurement is based on the absolute transient hot-wire method. All data acquisition and instrument control can be performed using a microcomputer. After filling with a sample liquid in a cell the apparatus can automatically measure the thermal conductivity at the desired temperature without any manual procedures. The automated procedures include an algorithm to determine onset time of natural convection. The applicability of the apparatus has been tested to measure the thermal conductivity of toluene at room temperature and the results have an estimated accuracy of ±1.0 to ±1.5% depending on a sample to be measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138095
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  • 9
    Electronic Resource
    Electronic Resource
    Subnanosecond protection circuits for oscilloscope inputs (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1804-1808 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Overvoltage protection circuits have been developed to protect oscilloscope inputs or other 50-Ω recording systems from fast (τr∼1 ns) rise-time pulses. These circuits are voltage dividers with linear output up to a specified level, typically 1.4 V, beyond which fast switching diodes limit the output to (approximately-less-than)5 V for inputs as high as 5 kV. The clipping circuits are frequency compensated for flat response to several hundred megahertz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138098
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  • 10
    Electronic Resource
    Electronic Resource
    Fast turbulent correlations from phase coherence velocimetry (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1831-1832 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Flows with coherent structures allow see-free measurements of local velocity and velocity fluctuations. Continuous turbulent velocity histories in ionizing shock waves are obtained at a 10-MHz sampling rate. From this, correlation profiles and frequency spectra are determined which reveal the presence of prominent high-frequency components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138103
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