An interferometer is a device constructed to split a beam of light into two perpendicular beams and then to bring the two beams together again. Any difference between the beams creates a pattern of interference that manifests itself as a group of...

One of the greatest topics for debate in the late nineteenth century was the nature of light: classical physicists believed that light was an undulatory wave--that it moved through a medium, just as sound does through air and tides through water. They...

A radio interferometer was invented by merging radio astronomy with computer technology. Radio astronomy began in the 1930s when Karl Jansky (1905-1950) built a radio receiver designed to locate interference that was plaguing long distance telephone...

Interferometry uses the principles of interference to determine properties about waves, their sources, or the wave propagation medium. Acoustic interferometry has been applied to study the velocity of sound in a fluid. Radio astronomers use...

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FEATURE Innovative Measurement by A.K. Maji and P. Montemerlo This article describes how to implement an interferometry system based on relatively inexpensive (under $10K) hardware and software (using the IMAQVision 1400 hardware and software system from National Instruments www.ni.com). The resulting system...

Electronic speckle interferometry techniques, including both digital speckle interferometry (DSI) and digital speckle shearography (DSS) offer many well-known advantages to the experimental mechanist. Applications range from relatively simple nondestructive inspection (NDI) through sophisticated 3-dimensional strain measurement. Much development of these techniques has taken place,...