SEARCH · Engineering Papers
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Laser-light spatial-domain scanning function for deconvolution of blurred photographs using point-spread and holographic Fourier transform division filter
Spatial domain deconvolution by laser scanning of blurred photographs, using holographic Fourier transform division filter and photoelectric integration
Automatic image interpretation and classification using two dimensional digital Fourier transforms
Cylindrical and helical antennas impedance in cold magnetoplasma, using three dimensional integral involving Fourier transform and Green function
Stellar IR spectra for types A0 to M7, using Mertz type Michelson interferometer as Fourier transform spectrometer
Device permitting simultaneous viewing of infrared images at different wavelengths consists of imaging lens, Michelson interferometer, array of infrared detectors, data processing equipment for Fourier transformation of detector signal, and image display unit. Invention is useful in earth resources applications, nondestructive testing, and medical diagnoses.
Linear interaction problem between spacecraft attitude control and flexible appendages solved in frequency domain using Fourier transform
Fourier transformation compensation for spectral averaging error reduction in low resolution spectroradiometry
Responses of balloon and falling sphere wind sensors in atmospheric turbulence, analyzed with Fourier transformation
Book on optical data processing covering light characteristics, Fourier transforms, spectrum analysis, photographic film, filtering, holography, etc
Structural panel under acoustic loading by supersonic convected turbulence, deriving responses with finite Fourier transforms
Vibrationally excited hydroxyl formation by atomic hydrogen reaction with ozone, using Fourier transform spectroscopy
Reaction rate of vibrationally excited hydroxyl with ozone, obtaining hydroxyl emission spectra by Fourier transform spectroscopy
High resolution holographic image deblurring methods involving coherent optical analog processing and Fourier transform division filter
Bistatic radar scattering cross section from slightly rough perfectly conducting infinite surface, using Fourier transform
Application of information theory to eliminate redundant part of electrocardiogram or vectorcardiogram is described. Operation of medical equipment to obtain three dimensional study of patient is discussed. Use of fast Fourier transform to accomplish data compression is explained.
A cryogenic gravity meter made of two parts, a magnetic suspension unit and a detection module, was used to monitor earth eigen vibrations. The magnetic field and field gradient are generated by energizing a set of superconducting coils made of niobium-zirconium alloy wire. The detection module is a double Josephson junction magnetometer. The output is printed on a chart recorder and later digitized using a computer; a Fourier transformation is performed on the accumulated data. The measurements of eigen vibrations are summarized in tabular and graphical representations.
Two different methods are applied to the analyses of finite width linear elastic plates with central cracks. Both methods give displacements as a primary part of the solution. One method makes use of Fourier transforms. The second method employs a coarse mesh of triangular second-order finite elements in conjunction with a single singularity element subjected to appropriate additional constraints. The displacements obtained by these two methods are in very good agreement. The results suggest considerable potential for the use of a cracked element for related crack problems, particularly in connection with the extension to nonlinear material behavior.