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Optical interferometry - Geodetic standard baseline measurements | | Optical interferometry - Geodetic standard baseline measurements: Encyclopedia II - Optical interferometry - Geodetic standard baseline measurements | | A famous use of white light interferometry is the precise measurement of geodetic standard baselines as invented by Yrjö Väisälä. Here, the light path is split in two, and one leg is "folded" between a mirror pair 1 m apart. The other leg bounces once off a mirror 6 m away. Only if the second path is precisely 6 times the first, will fringes be seen.
Starting from a standard quartz gauge of 1 m length, it is possible to measure distances up to 864 m by repeated multiplication. Baselines thus established are used to calibrate geodetic distance measurement equipment on, leading to a m ...
See also:Optical interferometry, Optical interferometry - Astronomical optical interferometry, Optical interferometry - For further information see, Optical interferometry - The Michelson-Morley experiment, Optical interferometry - Geodetic standard baseline measurements, Optical interferometry - Holography, Optical interferometry - Inertial navigation | | | Optical interferometry, Optical interferometry - Astronomical optical interferometry, Optical interferometry - For further information see, Optical interferometry - Geodetic standard baseline measurements, Optical interferometry - Holography, Optical interferometry - Inertial navigation, Optical interferometry - The Michelson-Morley experiment, List of astronomical interferometers at visible and infrared wavelengths | | |
| | | Optical interferometry: Encyclopedia II - Optical interferometry - Geodetic standard baseline measurements
Optical interferometry - Geodetic standard baseline measurements
A famous use of white light interferometry is the precise measurement of geodetic standard baselines as invented by Yrjö Väisälä. Here, the light path is split in two, and one leg is "folded" between a mirror pair 1 m apart. The other leg bounces once off a mirror 6 m away. Only if the second path is precisely 6 times the first, will fringes be seen.
Starting from a standard quartz gauge of 1 m length, it is possible to measure distances up to 864 m by repeated multiplication. Baselines thus established are used to calibrate geodetic distance measurement equipment on, leading to a metrologically traceable scale for geodetic networks measured by these instruments.
More modern geodetic applications of laser interferometry are in calibrating the divisions on levelling staffs, and in monitoring the free fall of a reflective prism within a ballistic or absolute gravimeter, allowing determination of gravity, i.e., the acceleration of free fall, directly from the physical definition at a few parts in a billion accuracy.
Other related archivesBetelgeuse, CHARA array, COAST, Cavendish Astrophysics Group, History of astronomical interferometry, IOTA, IoP, John E. Baldwin, List of astronomical interferometers at visible and infrared wavelengths, MRO Interferometer, Michelson-Morley experiment, Mount Wilson Observatory, NPOI, Navy Prototype Optical Interferometer, Sagnac interferometer, Special Theory of Relativity, VLTI, Yrjö Väisälä, adaptive optics, aether, aperture synthesis, attention, better article, changing this notice to be more specific, coherence length, coherent, correlation, electromagnetic waves, free fall, geodetic, geodetic networks, holography, inertial navigation, interferometry, laser, levelling, list of astronomical interferometers at visible and infrared wavelengths, measurements, metrologically, monochromatic, optical, quartz, ring laser gyroscopes, sodium, white light
 Adapted from the Wikipedia article "Geodetic standard baseline measurements", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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