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Interference (wave propagation)

About: Interference (wave propagation) is a research topic. Over the lifetime, 26086 publications have been published within this topic receiving 321110 citations.


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Journal ArticleDOI
TL;DR: A new class of signal-selective algorithms that are highly tolerant to interference and noise is introduced, and by virtue of the fact that the multiple-signal resolution problem is essentially eliminated by the signal selectivity of the algorithms, performance advantages are gained.
Abstract: For ptI see ibid, vol40, no5 p1168 (1992) For the problem of estimating time difference of arrival (TDOA) of radio waves impinging on a pair of antennas for the purpose of passively locating the source of a communications or telemetry signal in the presence of interfering signals and noise, a new class of signal-selective algorithms that are highly tolerant to interference and noise is introduced By virtue of the fact that the multiple-signal resolution problem is essentially eliminated by the signal selectivity of the algorithms, performance advantages are gained The new algorithms exhibit their signal selectivity regardless of the extent of temporal, spectral, or spatial overlap among received signals, yet their computational complexity is no more than that of conventional algorithms Algorithmic implementations of some of the new methods are given, and theoretical arguments given in ptI of this work are corroborated by quantitative evaluation of their performance >

116 citations

Journal ArticleDOI
TL;DR: In this paper, a quantitative comparison between two analytic theories for the propagation of electromagnetic waves in periodic dielectric structures is presented, and it is shown that dynamical diffraction theory is equivalent to the scalar wave approximation, in the limit of small dielectrics contrast.
Abstract: We present a quantitative comparison between two analytic theories for the propagation of electromagnetic waves in periodic dielectric structures. These theories have both been used extensively in the modeling of optical spectra of colloidal crystals exhibiting photonic band gap behavior. We demonstrate that dynamical diffraction theory is equivalent to the scalar wave approximation, in the limit of small dielectric contrast. This equivalence allows us to place quantitative limits on the validity of dynamical diffraction, relative to the predictions of the more accurate scalar wave theory. We also note that dynamical diffraction is often applied with boundary conditions which neglect the strong interference between the incident and diffracted waves within the periodic medium. These boundary conditions lead to expressions for the transmission spectrum which cannot be generalized to the case of normal-incidence propagation. We provide a corrected form for these expressions, and use them in comparisons with experimental spectra. Excellent agreement between theory and experiment is obtained for the widths of optical stop bands, for both positive and negative values of the dielectric contrast. These are among the first quantitative comparisons between theoretical and experimental optical spectra of colloidal photonic crystals.

115 citations

Journal ArticleDOI
TL;DR: This work demonstrates an interferometric scheme combined with a time-domain analysis to measure longitudinal velocities and shows the estimator to be efficient by reaching its Cramér-Rao bound.
Abstract: In a recent Letter, Brunner and Simon proposed an interferometric scheme using imaginary weak values with a frequency-domain analysis to outperform standard interferometry in longitudinal phase shifts [Phys. Rev. Lett105, 010405 (2010)]. Here we demonstrate an interferometric scheme combined with a time-domain analysis to measure longitudinal velocities. The technique employs the near-destructive interference of non-Fourier limited pulses, one Doppler shifted due to a moving mirror in a Michelson interferometer. We achieve a velocity measurement of 400 fm/s and show our estimator to be efficient by reaching its Cramer-Rao bound.

115 citations

Journal ArticleDOI
Leslie L. Deck1
TL;DR: The basic theory behind the technique is reviewed and applied specifically to the measurement of parallel plates, where surfaces, optical and physical thickness, and homogeneity are simultaneously obtained.
Abstract: Phase-shifting interferometry is a preferred technique for high-precision surface form measurements, but the difficulty in handling the intensity distortions from multiple-surface interference has limited the general use of the technique to interferometer cavities producing strict two-beam interference. I show how the capabilities of phase-shifting interferometry can be extended to address this problem using wavelength tuning techniques. The basic theory behind the technique is reviewed and applied specifically to the measurement of parallel plates, where surfaces, optical and physical thickness, and homogeneity are simultaneously obtained. Basic system requirements are derived, common error sources are discussed, and the results of the measurements are compared with theory and alternative measurement methods.

114 citations

Proceedings ArticleDOI
23 Aug 2010
TL;DR: A multipath model is formulated in order to estimate the interference and correct the measurements of multipath interference in a Time-of-flight camera and the positive impact of these corrections is experimentally demonstrated.
Abstract: Multipath interference is inherent to the working principle of a Time-of-flight camera and can influence the measurements by several centimeters. Especially in applications that demand for high accuracy, such as object localization for robotic manipulation or ego-motion estimation of mobile robots, multipath interference is not tolerable. In this paper we formulate a multipath model in order to estimate the interference and correct the measurements. The proposed approach comprises the measured scene structure. All distracting surfaces are assumed to be Lambertian radiators and the directional interference is simulated for correction purposes. The positive impact of these corrections is experimentally demonstrated.

114 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202213
2021840
20201,221
20191,432
20181,351
20171,311