Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 28. Chapters: Moire pattern, Interference filter, Adjacent-channel interference, Common-mode interference, Electromagnetic interference control, Conducted interference, Speckle pattern, Line moire, Phasor, Optical hybrid, Optical feedback, Beat, Dynamic speckle, N-Slit interferometer, N-slit interferometric equation, Co-channel interference, Shape moire, Transmitter Location Systems, Wolf tone, Fringe shift, Fresnel-Arago laws, Desensitization, Signal-to-interference ratio, Haidinger fringe, Multipath interference, Carrier-to-noise-density ratio. Excerpt: Line moire is one type of moire pattern; a pattern that appears when superposing two transparent layers containing correlated opaque patterns. Line moire is the case when the superposed patterns comprise straight or curved lines. When moving the layer patterns, the moire patterns transform or move at a faster speed. This effect is called optical moire speedup. Figure 1. Two layers with parallel linesSimple moire patterns can be observed when superposing two transparent layers comprising periodically repeating opaque parallel lines as shown in Figure 1. The lines of one layer are parallel to the lines of the second layer. The superposition image does not change if transparent layers with their opaque patterns are inverted. When considering printed samples, one of the layers is denoted as the base layer and the other one as the revealing layer. It is assumed that the revealing layer is printed on a transparency and is superimposed on top of the base layer, which can be printed either on a transparency or on an opaque paper. The periods of the two layer patterns are close. We denote the period of the base layer as pb and the period of the revealing layer as pr. The superposition image of Figure 1 outlines periodically repeating dark parallel bands, called moire lines. Spacing betwe...