Topic
Spatial filter
About: Spatial filter is a research topic. Over the lifetime, 6170 publications have been published within this topic receiving 100451 citations.
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TL;DR: In this article, a new type of electron-beam-addressed spatial light modulator has been demonstrated, based on the local tuning of an optothermal nonlinear interference filter by the scanned electron beam.
Abstract: A new type of electron-beam-addressed spatial light modulator has been demonstrated. It is based on the local tuning of an optothermal nonlinear interference filter by the scanned electron beam. Such an e-beam-tunable interference filter device should find applications in both display technology and optical data processing.
134 citations
TL;DR: In this paper, a class of aperture coded spectrometer is optimized for the spectral characterization of diffuse sources, which achieves high throughput and high spatial resolution by replacing the slit of conventional dispersive spectrometers with a spatial filter or mask.
Abstract: A class of aperture coded spectrometer is optimized for the spectral characterization of diffuse sources. The instrument achieves high throughput and high spatial resolution by replacing the slit of conventional dispersive spectrometers with a spatial filter or mask. A number of masks can be used including Harmonic masks, Legendre masks, and Hadamard masks.
133 citations
TL;DR: In this paper, the concept of propagation invariance in partially coherent optics is introduced and explicit expressions for the cross-spectral density and the angular correlation function (crossangular spectrum) characterizing a class of fields that are propagation invariant in the sense that their correlation properties in the space-frequency domain are exactly the same in every transverse plane.
Abstract: The concept of propagation invariance in partially coherent optics is introduced. Explicit expressions are given for the cross-spectral density and the angular correlation function (cross-angular spectrum) characterizing a class of fields that are propagation invariant in the sense that their correlation properties in the space-frequency domain are exactly the same in every transverse plane. The so-called diffraction-free beams are shown to be members of this new, wider class of wave fields, which itself is a subset of a generalized class of partially coherent self-imaging fields. The existence of partially coherent propagation-invariant fields with a sharp correlation peak is verified experimentally by considering radiation from a planar J0 Bessel-correlated source.
132 citations
TL;DR: This technique offers a new flexibility in the design of selective EMG measurement configurations by means of a given simple model of an excited motor unit and results compare well to the previously described experimental signals.
Abstract: Spatial filtering, particularly common in the field of engineering, is adapted in theory and practice to the filtering of propagating spatial EMG signals. This technique offers a new flexibility in the design of selective EMG measurement configurations. Longitudinal as well as two-dimensional spatial filters can be used. The conditions for the design of suitable spatial filters are deduced by signal theory. The performances of different selected configurations are compared by means of a given simple model of an excited motor unit. The modeling results compare well to the previously described experimental signals.
131 citations
TL;DR: In this paper, the response of an infinite two-dimensional periodic structure to point harmonic loading is analyzed and the response amplitude has a relatively smooth spatial distribution; if a caustic is present then the response has a complex spatial pattern and a "dead region" of very low response occurs.
130 citations