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Proceedings of the IEEE

Issue 1 • Jan. 1975

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Displaying Results 1 - 25 of 29
  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): c1
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    Freely Available from IEEE
  • Scanning the issue

    Publication Year: 1975, Page(s):3 - 5
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    Freely Available from IEEE
  • Infrared detectors in remote sensing

    Publication Year: 1975, Page(s):6 - 14
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1014 KB)

    The history of the development of infrared detectors is briefly reviewed. The parameters describing the performance of detectors are described and the measurement procedures outlined. Recent developments in intrinsic HgCdTe and PbSnTe, extrinsic silicon, and pyroelectric detectors are reviewed. Several applications of detector technology to specific remote sensing problems are discussed. View full abstract»

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  • Infrared detector arrays by new technologies

    Publication Year: 1975, Page(s):14 - 26
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1615 KB)

    Techniques for fabricating single-crystal and thin-film detector arrays for infrared remote sensing have been developed in the last few years in most advanced solid-state laboratories. Arrays of photovoltaic devices have been prepared by liquid-phase epitaxy and vapor transport, and by the formation of metal-semiconductor structures and by proton bombardment. A great improvement in infrared thin-f... View full abstract»

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  • High-performance 8—14- µm Pb1-xSnxTe photodiodes

    Publication Year: 1975, Page(s):27 - 32
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1126 KB)

    Photovoltaic detectors of Pb1-xSnxTe, sensitive in the 8- 14-µm spectral region, with near-theoretical performance characteristics, have been fabricated by a surface inversion technique. These detectors have exhibited quantum efficiencies of up to 45 percent limited by surface reflection), zero-bias resistance-area products of 21 Ωċcm2and background-... View full abstract»

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  • Heterojunction III—V alloy photodetectors for high-sensitivity 1.06-µm optical receivers

    Publication Year: 1975, Page(s):32 - 37
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    A new type of 1.06-µm solid-state detector is discussed, the inverted hetrojunction III-V alloy mesa photodiode, which offers quantum efficiencies near 1.00 percent, extremely low capacitance and transit time, and low dark currents. The characterstics of these detectors allow their use in sensitive 1.06-µm optical receivers which promise better signal-to-noise ratios in a number of appli... View full abstract»

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  • Imaging devices using the charge-coupled concept

    Publication Year: 1975, Page(s):38 - 67
    Cited by:  Papers (85)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3148 KB)

    A unified treatment of the basic electrostatic and dynamic design of charge-coupled devices (CCD's) based on approximate analytical analysis is presented. Clocking methods and tradeoffs are discussed. Driver power dissipation and on-chip power dissipation are analyzed. Properties of noise sources due to charge input and transfer are summarized. Low-noise methods of signal extraction are discussed ... View full abstract»

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  • Application of charge-coupled devices to infrared detection and imaging

    Publication Year: 1975, Page(s):67 - 74
    Cited by:  Papers (14)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (733 KB)

    A review of infrared sensitive charge-coupled devices (IRCCD) is presented. Operational requirements of typical IRCCD applications are briefly introduced. IRCCD devices are divided into two major categories: a) Monolithic devices, which essentially extend the original CCD concept into the IR. Monolithic IRCCD's discussed include inversion-mode devices (with narrow bandgap semiconductor substrate),... View full abstract»

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  • Methods of calculating atmospheric transmittance and radiance in the infrared

    Publication Year: 1975, Page(s):75 - 94
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2155 KB)

    Radiation from remotely sensed objects in the earth's environment is attenuated in its passage through the atmosphere. In the infrared region of the spectrum, this is caused, for clear-sky conditions, mainly through absorption by atmospheric molecular species, i.e., the atmospheric gases. Molecular absorption is characterized by a highly variable, more-or-less random, frequency dependence which is... View full abstract»

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  • System design considerations for advanced scanners for earth resource applications

    Publication Year: 1975, Page(s):95 - 103
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    Optical mechanical scanners offer a means for producing imagery from earth orbiting platforms in many wavelength bands simultaneously ranging from the visible to about 13 µm. Since the signal is in electrical form, it can be telemetered to earth where the spectral content of each scene element can be processed to classify features based on their spectral properties. Optical mechanical scanner... View full abstract»

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  • The military applications of remote sensing by infrared

    Publication Year: 1975, Page(s):104 - 128
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2909 KB)

    Remote sensing is the process of acquiring information from the environment by the use of a sensor that is not in physical contact with the object under study. The military services are experienced practitioners of this old, but newly glamorous, art. Their accomplishments in the infrared, that region lying between visible light on the one hand and microwaves on the other, are both impressive and o... View full abstract»

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  • Geologic applications of thermal infrared images

    Publication Year: 1975, Page(s):128 - 137
    Cited by:  Papers (76)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1283 KB)

    Thermal infrared images provide information about the near-surface physical state of geologic materials, particularly, the density, water content, and heat transfer. Nonterrestrial planetary studies, conducted at fairly coarse resolution, have been useful primarily in determining the distribution of rock fragments. Terrestrial studies, conducted from satellite and aircraft at coarse to fine resolu... View full abstract»

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  • The potential role of thermal infrared multispectral scanners in geological remote sensing

    Publication Year: 1975, Page(s):137 - 147
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1427 KB)

    Thermal infrared scanners with multiple channels in the 8-14-µm wavelength region are important for geological remote sensing because this spectral region contains important compositional information about silicate rocks and minerals that cannot be duplicated by remote sensors operating elsewhere in the electromagnetic spectrum. Emittance minima in this spectral region, caused by interatomic ... View full abstract»

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  • Meteorological applications of remote sensing from satellites

    Publication Year: 1975, Page(s):148 - 163
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2616 KB)

    Satellites provide meteorologists with a data source unmatched at comparable spatial and temporal coverage by any existing or practical alternate source. There are limitations, however, both instrumental and fundamental, imposed on the achievable resolution and accuracy. Current and promising future contributions to meteorology from satellite-borne sensors are discussed, with emphasis on performan... View full abstract»

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  • A multilevel multispectral data set analysis in the visible and infrared wavelength regions

    Publication Year: 1975, Page(s):164 - 175
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2372 KB)

    Skylab multispectral scanner data, digitized Skylab color infrared (IR) photography, digitized Skylab black and white multiband photography, and Earth Resources Technology Satellite (ERTS) multi-spectral scanner data collected within a 24-h time period over an area in south-central Indiana near Bloomington on June 9 and 10, 1973, were compared in a machine-aided land use analysis of the area. The ... View full abstract»

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  • Performance—Cost analysis of electrooptical systems

    Publication Year: 1975, Page(s):176 - 189
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1636 KB)

    A summary description of the status of electrooptical (EO) systems is given. Performance equations and parameters affecting the design of an EO system are given. Typical performance-cost tradeoff analysis is discussed. The system transfer functions, noise, sensitivity, resolutions, fields of view, and other practical considerations are discussed. Factors affecting cost of an electrooptical system ... View full abstract»

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  • Calculating Fourier coefficients for Chebyshev patterns by recurrence formulas

    Publication Year: 1975, Page(s):195 - 196
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (246 KB)

    Two recurrence schemes are given for finding Amin Tn(ax + b) = Σm=0nAmTm(x) for given n, a, and b, where Tm(x)= cos (m arccos x). This problem arises in the calculation of feeding coefficients to produce optimum beam patterns in the design of certain linear arrays. View full abstract»

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  • A method for computing large-scale two-dimensional transform without transposing data matrix

    Publication Year: 1975, Page(s):196 - 197
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (267 KB)

    A fast algorithm is presented for a two-dimensional transform of a data matrix such as Fourier or Hadamard transforms. It can be applied to a matrix, which is too large for the main storage and is stored sequentially rowwise in an auxiliary storage. The size of the matrix may be of Rmrows and of arbitrary number of columns. Whenever R rows of working area are available in the main stora... View full abstract»

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  • A tunable filter using amplifier pole

    Publication Year: 1975, Page(s):197 - 199
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A circuit consisting of two periodically operated switches, potentiometers, resistors, and compensated operational amplifiers, but not containing external capacitors, is proposed for the realization of a second-order bandpass and low-pass filter. The filter is electronically tunable and the natural frequency of the filter varies linearly with the width of the pulses controlling the FET switches. View full abstract»

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  • On the boundedness of solutions of an nth-order time-lag system

    Publication Year: 1975, Page(s):199 - 200
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (191 KB)

    A boundedness criterion is established between the solutions of an nth-order nonlinear functional differential equation and an nth-order nonlinear ordinary differential equation. View full abstract»

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  • A note on generation of constituent matrices

    Publication Year: 1975, Page(s):200 - 201
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (197 KB)

    A simple method for the generation of the constituent matrices when multiple eigenvalues are present is outlined. The method is based on the generation of an appropriate resolving polynomial for the multiple eigenvalue. View full abstract»

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  • On the properties of the product of the impedance and admittance matrices of three-conductor transmission lines

    Publication Year: 1975, Page(s):201 - 202
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (215 KB)

    The purpose of this letter is to show that the product of the impedance and admittance matrices of three-conductor transmission lines is never in the form [aa,b0] or [aa,0b] when s = jω The significance of this result is discussed. View full abstract»

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  • Doppler processing using Walsh and hard-limited Fourier transforms

    Publication Year: 1975, Page(s):202 - 203
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (253 KB)

    The use of Walsh and hard-limited Fourier transforms to synthesize banks of contiguous Doppler filters is examined for the case of a 32-point transform. It is found that the former is generally inferior to the latter from the point of view of number and size of spurious sidelobes. View full abstract»

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  • Two quaternary quadratic residue codes

    Publication Year: 1975, Page(s): 202
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (126 KB)

    The weight distributions of the (13, 6) and the (17, 8) quaternary quadratic residue codes are computed. View full abstract»

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  • Comments on "Automatic measurement of complex dielectric constant and permeability at microwave frequencies"

    Publication Year: 1975, Page(s):203 - 205
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (347 KB)

    In the above paper, erroneous data were obtained for some frequencies and were attributed to equipment instability. However, it is shown in this letter that the "errors" were due to singularities in the parameters being measured, as can be seen by examining the equations involved. Additionally, comments are made with regard to resolving the phase ambiguity in the measurement. View full abstract»

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North Carolina State University