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  • Dynamic impedance characteristics of a moving-coil loudspeaker motor element

    Creator:
    Thurman, Harry Lyle
    Resource Type:
    Masters Thesis
    Full Text:
    average poder input at thz point of over drive is thirteen watts. A ciane in acoustic impedance occurs

  • Covariance function of the acoustic backscatter from a school of fish

    Creator:
    Swarts, Robert Leroy
    Abstract:
    A recently developed statistical model for first-order scattered fields is used to predict the normalized covariance function of an underwater acoustic signal backscattered by a hypothetical school of fish. The fish school is configured as an oblate spheroid with the individual fish Poisson distributed within the school. Empirical covariance functions...
    Resource Type:
    Masters Thesis
    Full Text:
    Covariance function of the acoustic backscatter from a

  • A parametric analysis of the capabilities of undersea acoustic imaging

    Creator:
    Calligan, C. C.
    Abstract:
    The feasibility of utilizing acoustic imaging techniques for improving the undersea viewing capability of small submersibles is investigated. The limiting values of major parameters in acoustic imaging systems are established and graphs which illustrate the parametric relationships are presented. A series of sample calculations illustrate how the graphs can be...
    Resource Type:
    Masters Thesis
    Full Text:
    performed on four specially constructed electro-acoustic projectors have verified the validity of several

  • Error analysis in scanned holography

    Creator:
    Collins, Heber Dale
    Abstract:
    Acoustic scanned holography is a method of lensless photography which uses sound waves to construct the hologram and light waves to reconstruct the image. The receiving transducer scans a plane area containing the sound field generated or scattered from the objects. In simultaneous source receiver scanning, both the source and...
    Resource Type:
    Dissertation

  • Simplified method of determining the acoustical coefficient of absorption of materials

    Creator:
    Lind, Edward Raymond
    Resource Type:
    Masters Thesis

  • An underwater acoustic imaging system

    Creator:
    Kolar, Michael John
    Abstract:
    An experimental underwater acoustic imaging system has been designed and built. Operating at 650 KHz, real time acoustic images are obtainable. Using both geometrical optics and Fourier optics, the theory of image formation and resolution is presented. Other factors affecting image quality and system acuity are also discussed. System components...
    Resource Type:
    Masters Thesis
    Full Text:
    corresponding optical wavefront (1). In fact, operation of 6 an electro-acoustic transducer assures almost

  • Computer analysis of a class of acoustic signals

    Creator:
    Miller, Michael Robert
    Abstract:
    A procedure for displaying cursory computer analyses of time series acoustic signals is described. The graphic presentation is optimized for visual analysis. The results displayed represent time series signals and/or Power Spectral Density estimates. Both hardware and software components of the procedure are described and compared with current methods. Suggestions...
    Resource Type:
    Masters Thesis
    Full Text:
    : Computer Analysis of a Class of Acoustic Signals Abstract approved: Redacted for Privacy W. Richards

  • A comparison of auditory and visual graphs for use in physics and mathematics

    Creator:
    Sahyun, Steven Carl
    Abstract:
    The ability to interpret graphical information is a prime concern in physics as graphs are widely used to give quick summaries of data sets, for pattern recognition, and for analysis of information. While visual graphs have been developed so that their content can be readily and concisely discerned, there is...
    Resource Type:
    Dissertation

  • Nonlinear Raman spectroscopy of gases

    Creator:
    Lundeen, Thomas F.
    Abstract:
    Applications of several methods of coherent nonlinear Raman Spectroscopy have been made in this thesis research. The theory and potential of one of these, Photoacoustic Raman Spectroscopy (PARS), is discussed in chapter two. Experimental results are presented which illustrate the sensitivity of this method and establish sampling conditions for maximum...
    Resource Type:
    Dissertation
    Full Text:
    acoustic signals. As part of this work a new photoacoustic Raman cell was designed which is simple to use

  • Performance and optimization of pulsed UWB localization with large number of sources

    Creator:
    Kwon, Changho
    Abstract:
    Pulsed ultra-wideband (UWB) radio uses extremely short pulses to transmit information. Such pulses provide very fine timing information, which has led to technological advances in high-precision localization. This thesis focuses on techniques and experiments of Time-Difference-of-Arrival (TDOA) localization of a large number of simultaneous sources. First, common localization techniques such...
    Resource Type:
    Masters Thesis