interferometer method
21Optical DPSK demodulator — An Optical DPSK demodulator is a device that provides a method for converting an optical differential phase shift keying (DPSK) signal to an intensity keyed signal at the receiving end in fiber optic communication networks. It is also known as… …
22Pendulum — This article is about pendulums. For other uses, see Pendulum (disambiguation). Simple gravity pendulum model assumes no friction or air resistance …
23telescope — /tel euh skohp /, n., adj., v., telescoped, telescoping. n. 1. an optical instrument for making distant objects appear larger and therefore nearer. One of the two principal forms (refracting telescope) consists essentially of an objective lens… …
24Michelson–Morley experiment — Box plots based on data from the Michelson–Morley experiment The Michelson–Morley experiment was performed in 1887 by Albert Michelson and Edward Morley at what is now Case Western Reserve University in Cleveland, Ohio. Its results are generally… …
25De Broglie–Bohm theory — Quantum mechanics Uncertainty principle …
26Mount Wilson Observatory — The 100 inch (2,500 mm) Hooker telescope that Edwin Hubble used to discover the general expansion of the universe …
27Closure phase — The closure phase is an observable quantity in imaging astronomical interferometry, which allowed the use of interferometry with very long baselines. It forms the basis of the self calibration approach to interferometric imaging. The observable… …
28Null corrector — Testing a spherical mirror using an interferometer. All surfaces in the tester are either flat or spherical, so the tester itself is fairly easy to fabricate and test. This setup can test a spherical mirror of any size since the wavefront is… …
29Timeline of telescopes, observatories, and observing technology — Timeline of telescopes, observatories, and observing technology.Before Common Era (B.C.)2100*Xiangfen Astronomical Observatory, Xiangfen County, Linfen City, Shanxi Province, China 1100* 11th 7th century B.C., Zhou dynasty astronomical… …
30Elitzur-Vaidman bomb-tester — In Physics, the Elitzur Vaidman bomb testing problem is a thought experiment in quantum mechanics, first proposed by Avshalom Elitzur and Lev Vaidman in 1993. An actual bomb tester was constructed and successfully tested by Anton Zeilinger, Paul… …
