two-wavelength interferometer
71Optical telescope — Eight Inch refracting telescope (Chabot Space and Science Center) An optical telescope is a telescope which is used to gather and focus light mainly from the visible part of the electromagnetic spectrum for directly viewing a magnified image for… …
72Radio telescope — A radio telescope is a form of directional radio antenna used in radio astronomy and in tracking and collecting data from satellites and space probes. In their astronomical role they differ from optical telescopes in that they operate in the… …
73Infrared spectroscopy — (IR spectroscopy) is the subset of spectroscopy that deals with the infrared region of the electromagnetic spectrum. It covers a range of techniques, the most common being a form of absorption spectroscopy. As with all spectroscopic techniques,… …
74Voyager 1 — This article is about the spacecraft. For the album by The Verve, see Voyager 1 (album). For fictional Voyager One from Space: 1999, see Voyager One (Space: 1999). Voyager 1 Voyager …
75History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… …
76Mirror — looking glass redirects here. For other uses, see Looking Glass (disambiguation). This article is about wave reflectors (mainly, specular reflection of visible light). For other uses, see Mirror (disambiguation). A mirror, reflecting a vase A… …
77Optical dilatometer — An optical dilatometer is a non contact device able to measure thermal expansions or sintering kinetics of any kind of materials, unlike traditional push rod dilatometer, it can push up to the dilatometric softening of the specimen. It is a… …
78Star — For other uses, see Star (disambiguation) …
79Gires-Tournois etalon — In optics, a Gires Tournois etalon is a transparent plate with two reflecting surfaces, one of which has very high reflectivity. Due to multiple beam interference, light incident on the lower reflectivity surface of a Gires Tournois etalon is… …
80Interferometric modulator display — (IMOD)cite web url=http://www.qualcomm.com/common/documents/white papers/QMT Technology Overview 12 07.pdf title=Interferometric Modulator (IMOD) Technology Overview | format=PDF | accessdate=2008 08 07 | publisher=Qualcom date=May 2008 ] is an… …
