Journal ArticleDOI
Mapping of noiselike sound sources with acoustical holography.
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This article is published in Applied Optics.The article was published on 1975-07-01. It has received 12 citations till now. The article focuses on the topics: Holography.read more
Citations
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Journal ArticleDOI
Near field determination of the complex radiation efficiency and acoustic intensity distribution for a resonality vibrating surface
Colin H. Hansen,David Alan Bies +1 more
TL;DR: In this paper, an experimental procedure is described which allows both the resistive and reactive parts of the acoustic radiation efficiency of a resonantly vibrating surface to be determined from measurements in the acoustic near field.
Journal ArticleDOI
Imaging of Acoustic Radiation Sources with Acoustical Holography
TL;DR: In this article, a lock-in amplifier was used to obtain the distribution of radiation sources at a frequency of 9·9 kHz using rotating gears as a test object, and an experiment based on this principle has been successfully carried out to obtain a distribution of radii in a rotating gears.
Journal ArticleDOI
Principles of broad-band coherent imaging
TL;DR: In this article, a unified theory of coherent imaging or holography with broad-band illumination is developed in terms of the temporal impulse response, the spectral frequency response, and cross-correlation imaging with noise illumination of the object.
Book ChapterDOI
Bispectral Passive Holographic Imaging System
TL;DR: A new ultrasonic and/or acoustical imaging system, which uses non-Gaussian random signals and cross- and auto-bispectral analysis is presented in this paper, which is especially effective when it is used under fairly large additive Gaussian noises.
References
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Journal ArticleDOI
Pictorial Output with a Line Printer
TL;DR: An improved method for the production of pictorial output on a line printer by overprinting up to eight characters, and pseudorandom noise is used to smooth out discontinuities in the range of print densities.
Journal ArticleDOI
Use of Acoustical Holography for the Imaging of Sources of Radiated Acoustic Energy
TL;DR: In this paper, it is experimentally demonstrated that scanned-receiver acoustical holography is useful for mapping or imaging those parts of a complex vibrator responsible for the energy radiated to the far field.