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Ocean 73 - IEEE International Conference on Engineering in the Ocean Environment

25-28 Sept. 1973

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Displaying Results 1 - 25 of 116
  • [Front cover and table of contents]

    Publication Year: 1973, Page(s): 0
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    Freely Available from IEEE
  • Foreword

    Publication Year: 1973, Page(s): 0
    Cited by:  Papers (1)
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1973, Page(s): 0
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    Freely Available from IEEE
  • An improved light source for underwater illumination

    Publication Year: 1973, Page(s):4 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (294 KB)

    An improved underwater light system developed at the Naval Undersea Center is described. This light system has been designed for use with underwater television cameras on deep-diving submersibles. There are several features unique to this light system which improve its performance over existing underwater lights; among these are: short start and restart times, two different light sources for use i... View full abstract»

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  • Predicted system performance of improved underwater light sources

    Publication Year: 1973, Page(s):7 - 17
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    The system performance of the two improved underwater light sources which have been recently developed at the Naval Undersea Center and other advanced light sources is predicted by computer simulation. System performance is evaluated as a function of source-receiver separation, receiver sensitivity, and the angular extent of the beam pattern of the source in representative samples of coastal and d... View full abstract»

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  • Performance data on cadmium and zinc metal vapor arc lamps as efficient light sources for deep ocean waters

    Publication Year: 1973, Page(s):18 - 23
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (377 KB)

    The optical attenuation characteristics of deep ocean waters show a broad minimum between 460 nm and 510 nm. Optical sources for underwater applications should emit in this ocean window to minimize the required optical power. To fulfill this need for an efficient source, a new pair of are lamps were developed: zinc-xenon and cadmium-xenon. Performance and engineering data on this type of short-are... View full abstract»

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  • A deep-ocean electronic nephelometer

    Publication Year: 1973, Page(s):24 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (588 KB)

    An electronic nephelometer which senses45degforward-scattered light as a measure of the concentration of particulate matter in deep-ocean water is described. The device consists of a light source and collimator, and a detection stage which uses a PIN photodiode, operational amplifier, correlation detector and a VCO. The VCO output is fed into the mixer of an STD system which transmits s... View full abstract»

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  • Laser scanner and its application

    Publication Year: 1973, Page(s):31 - 34
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (302 KB)

    Large angle laser beam scanning was achieved by using holographic technique, and applied to a range finder system. The holographic scanner consists of the rotating drum (1200 rpm) and 50 hologram plates with it and deflects light beam in14degholizontally and in6deg40' vertically at 1000 scans per sec. Deflected laser beam is reflected back from the target and detected by phot... View full abstract»

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  • Laser beam behavior in the sea water

    Publication Year: 1973, Page(s):35 - 38
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (257 KB)

    Behaviors of laser beams propagating through the sea water were measured, which are a beam profile and a attenuation characteristic. The maximum distance detecting a laser beam was obtained by using a photon counter to 26.5 attenuation length. The propagation experiment was conducted at Sakaide Bay in Seto inland sea. A new towtypealphameter was constructed to measure a cluster of optic... View full abstract»

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  • A scanned laser and tracking system for sea floor profiling and precision survey

    Publication Year: 1973, Page(s):39 - 44
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (493 KB)

    A feasibility study for a scanned laser to generate a contour map of the sea floor has been completed. Analysis and experimental test results indicate improved horizontal resolution compared to side scan sonar for ranges to approximately 90 meters in clear water (alphaleq .05 m^{-1}) and vertical accuracy to 0.75%. The configuration studied performs best in a side-to-side scan below the... View full abstract»

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  • A pivoted-vane, current meter

    Publication Year: 1973, Page(s):46 - 49
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (354 KB)

    The design and application of a pivoted-vane, current meter are described. The purpose of the meter is to measure turbulence parameters in natural waters, such as estuaries or the ocean. The self-aligning instrument can be cable suspended and is capable of simultaneously measuring horizontal and vertical components of velocity and their turbulent fluctuations. A variable frequency oscillator using... View full abstract»

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  • Solid state current meters

    Publication Year: 1973, Page(s):50 - 54
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (417 KB)

    The performance evaluation of several solid-state, no-moving-parts water current meters of different manufacture is reported by the National Oceanographic Instrumentation Center. These tests have uncovered both design deficiencies and operational problems with the instruments. The design of the instruments studied include electromagnetic, vortex-shedding, and acoustic doppler types. In the case of... View full abstract»

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  • A new method for measuring ocean and tidal currents

    Publication Year: 1973, Page(s):55 - 58
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (223 KB)

    Currents induce changes in the travel time of an acoustic signal. This effect can be exploited to measure current velocity. Theoretical calculations are compared with experimental measurements over a 33-km range. Equations and a system layout are presented for measurement of current velocity when the sound speed is spatially variable. Simplifications that are possible when the current direction is... View full abstract»

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  • Feasibility of remote underwater current measurement using acoustic doppler techniques

    Publication Year: 1973, Page(s):59 - 63
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (457 KB)

    Based on available information on the concentration and size distribution of underwater scatterers, the acoustic scattering cross section of some typical scatterers is estimated. In particular, the scattering characteristics of suspended matter and temperature inhomogeneities are examined in detail. These results, in conjunction with the radar/sonar equation, are employed to ascertain the feasibil... View full abstract»

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  • High frequency radio measurements of ocean currents

    Publication Year: 1973, Page(s):64 - 67
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (274 KB)

    HF radio waves backscattered from the ocean surface can be used to remotely measure ocean surface currents. Measurements of the range-Doppler spectrum of these signals yields the wavelength and frequency of the scattering ocean waves, and thus their phase velocity.This velocity is subtracted from the velocity the wave would have in still water, and the difference is a measure of the average (over ... View full abstract»

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  • A small "In situ" conductivity instrument

    Publication Year: 1973, Page(s):68 - 75
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    An instrument for measuring the conductivity (specific conductance) of seawater in situ is described. Basically the instrument consists of a three-terminal, platinum electrode flow-through cell which acts as the variable resistance in a Wien bridge oscillator. The oscillator section is well suited to drive the cell, since the ac signal amplitude is so small that polarization effects are minimized.... View full abstract»

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  • An optical radar for airborne use over natural waters

    Publication Year: 1973, Page(s):76 - 83
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    An optical radar for detecting targets in natural waters was built and tested in the Gulf of Mexico. The transmitter consists of a Q-switched neodymium-glass laser, with output amplified and doubled in KDP to 0.53 micrometer wavelength. The receiver incorporates a novel optical spatial filter to reduce the dynamic range required of the photodetector to a reasonable value. Detection of targets to a... View full abstract»

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  • "Prediction of pollutant dispersion in coastal waters"

    Publication Year: 1973, Page(s): 84
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (39 KB)

    This paper deals with the problem of predicting the fate of effluents discharged into coastal waters and covers theoretical and experimental techniques. Field measurements are made in order to understand coastal processes effecting dispersion and as input to and validation for theoretical models. Strong coupling between field measurements and theoretical modeling is emphasized and some examples fr... View full abstract»

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  • Performance estimates of doppler tracking systems

    Publication Year: 1973, Page(s):86 - 91
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (579 KB)

    Of the several existing techniques for the passive acoustic reconstruction of underwater target-sensor geometries, the procedure based upon the Doppler shift phenomenon has received considerable attention. A fundamental requirement for the design of any Doppler tracking system or algorithm is a measure of the optimal performance that may be expected for a given set of operating conditions. This pa... View full abstract»

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  • Space time factorability of active sonar array processors

    Publication Year: 1973, Page(s):92 - 95
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (295 KB)

    An active sonar array processor is concerned with the detection of a signal echo reflected from a target in the presence of reverberation. The present paper derives conditions on signal, reverberation and array parameters under which the optimum (likelihood ratio) detector can be factored into spatial and temporal operations. Also, a brief attempt is made at signal design under the criterion of fa... View full abstract»

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  • The effect of sound velocity profile variability on range to the first convergence zone

    Publication Year: 1973, Page(s):96 - 100
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (363 KB)

    A study of temporal variability in oceanic sound velocity structure was undertaken in order to determine its effect on the propagation of acoustic waves to the first convergence zone. A statistical analysis was performed using sound velocity profiles measured in 3 different geographic locations. The results give some basis for predicting temporal variations in range to the first convergence zone c... View full abstract»

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  • The estimation of non-stationary filtered poisson process intensity using an adaptive algorithm based on the occurrence of peaks

    Publication Year: 1973, Page(s):101 - 105
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (381 KB)

    A recursive algorithm for estimating the intensity parameter of a non-stationary filtered Poisson process is presented. The algorithm, which is tested on simulated acoustic volume reverberation, adjusts the scatterer density until the number of peaks in a segment of simulated reverberation approaches the number of peaks in a corresponding segment of measured reverberation. Extensions of the algori... View full abstract»

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  • Partitioned and modified chirp Z-transform: Signal processing technique for simultaneous multifrequency evaluation of the surface reradiated spectrum in slowly varying environments

    Publication Year: 1973, Page(s):106 - 111
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (362 KB)

    The partitioned and modified chirp Z-transform (PAM-CZT) is a signal processing technique for computing the Z-transform of a sequence at equally spaced samples on a sector of the unit circle in the Z-plane. Unlike the computationally cumbersome classical technique (4), the PAM-CZT utilizes the fast Fourier transform (FFT) that allows real time implementation with state of the art minicomputers. An... View full abstract»

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  • D/A correlator structures

    Publication Year: 1973, Page(s):112 - 117
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (534 KB)

    A number of high-speed correlator structures appropriate for the processing of signals in sonar and communication systems are described. Various combinations of shift registers, exclusive/ORs, charge-coupled devices, and acoustic surface-wave devices can be used to implement, in modular form, M-bit-vs-binary, M-bit-vs-N-bit, or analog-vs-N-bit correlators and matched filters. Programmability of bo... View full abstract»

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  • Signal processing for precise ocean mapping

    Publication Year: 1973, Page(s):118 - 124
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (490 KB)

    In this work a bottom return signal model and accompanying signal processor are described for a wide swath bottom mapping system. An incoherent scattering model is employed under the assumptions that the bottom is a random rough surface composed of a large number of independent scatterers with spatial correlation distance negligible relative to the ensonified area. The signal received from the var... View full abstract»

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