| Speckle Pattern |
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In optical systems, a speckle pattern is a Field - Intensity pattern produced by the mutual Interference of partially Coherent beams that are subject to minute temporal and spatial fluctuations. Note: In a multimode fiber, a speckle pattern results from a superposition of Mode field patterns. If the relative modal group velocities change with Time , the speckle pattern will also change with time. If Differential Mode Attenuation occurs, Modal Noise results. Source: from Federal Standard 1037C and from MIL-STD-188 A speckle pattern of Antinuclear Antibody (ANA) is characteristic of the disease Lupus Erythematosus . |