An instrument that uses the interference of light waves to measure the accuracy of optical surfaces.

A device that uses an interference pattern to determine wave frequency, length or velocity.

An instrument which measures the accuracy of an optical element utilizing interference phenomena based on the wave characteristics of light Long pass filter A filter which transmits the longer wavelengths and rejects the shorter wavelengths The effective refractive index of the filter

An instrument that employs the interference of light waves to measure the wavefront.

An interferometer uses the wavelength in laser light as an extremely high precision ruler.

a type of telescope in which signals from two or more small telescopes are combined to produce an image with the resolution of a much larger telescope. The larger the seperation between the individual telescopes, the higher the resolution of the resulting image. (See also text in baselines.)

An instrument for determining the spectral distribution of irradiance. A light interferometer divides a beam of light into two or more beams and brings the beams back together. The recombined beams shine on a screen or another object like a detector surface. The resulting interference fringes can be used to determine the spectral nature of light.

any instrument designed for producing and studying interference of two or more trains of waves or beams of electromagnetic radiation of the same range of wavelengths. Usually denotes an optical interferometer that separates a beam of light into two or more parts that travel in different paths and are then combined together to produce interference fringes.

Collection of two or more telescopes working together as a team, observing the same object at the same time and at the same wavelength. The effective diameter of an interferometer is equal to the distance between its outermost telescopes.

an array of telescopes connected electronically to act as one large telescope with much improved resolution. The resolution of the interferometer is equal to a single telescope having a diameter equal to the length of the interferometer.

any measuring instrument that uses interference patterns to make accurate measurements of waves

a beamsplitter usually a piece of partially-mirrored glass that deflects only a small part of a beam aimed through the glass

a clever way, a very sneaky way of getting detailed information on objects in space without spending a fortune in building a telescope

a device for measuring wavelengths of specific light sources and distance

a device that analyzes the light collected by separate detectors to achieve a resolving power determined not by their diameter, but by their separation distance

a device that can show the interference of light

a device that catches and combines beams of light

a device that measures the interference of light waves to obtain very precise measurements of astronomical objects

a device that superimposes or mixes wave phenomena from two coherent sources

a device to make such measurements

a device which splits a beam of light into two sub-beams, shifts the phase of one sub-beam with respect to the other,

a setup of mirrors and beam splitters to vary the amount of distance each beam travels in order to introduce a phase difference when the beams are recombined

a telescope constructed by connected two or more telescopes together to simulate a larger one

a type of instrument that combines light from two or more telescopes to obtain measurements with higher resolution than what could be obtained with a single telescope alone

An instrument that uses the interference of wave forms to measure very small distances.

A device that combines signals radiating from a common source but received at different locations, to produce fringes. The fringes result from the interference between the received signals, and rotate in phase as the relative path differences change. From analysis of the fringe visibility the angular extent of the source may be infered. A map of the source may be produced by using a range of different baselines.

A scientific device which makes use of the Interference of waves—typically, light waves. This type of device can measure changes in length with extraordinary precision, and forms the basis of modern gravitational wave detectors.

a device for measuring the displacement of an object using the interference of light, the beam from an optical source (usually laser) is split into a reference leg and a measurement leg, then recombined to form an interference (phase difference) pattern, as the optical path length of the measurement leg changes, the interferogram changes and can be measured, heterodyne-type interferometers use the Doppler shift in an optical beat- frequency for velocity measurement which is integrated to get displacement

A radio telescope consisting of two or more antennas at some distance from one another. It uses the phenomenon of interference in order to increase the effective resolving power of the antennas.

a system of two or more widely separated telescopes that achieves the resolving power of a much larger telescope

Interferometers can be radio or optical. They use the principle of interference of electromagnetic waves to enable the combination of light or radio waves from two apertures to be combined. This greatly increases the resolution of an instrument. The star Capella was resolved into two stars by a team using optical interferometry whilst many of the worlds radio astronomers link dishes in different countries to get better pictures of radio galaxies.

Any of several optical, acoustic, or radio frequency instruments that use interference phenomena between a reference wave and an experimental wave or between two parts of an experimental wave to determine wavelengths and wave velocities, measure very small distances and thicknesses, and measure indices of refraction.

a device used to measure an interferogram; typically an optical device that causes a radiation beam to splits into two beams, recombines them after they traveled different distances (optical path difference) and measures the detector response as a function of optical path length difference.

Instrument that utilizes the interference of light waves for precise determination of wavelengths. It consists of two or more separate telescopes that combine their signals almost as if they were coming from separate portions of a telescope, as big as the two telescopes are apart.

In reference to testing fiber optic cable assemblies, an interferometer is used to measure the endface geometry of the connector after polishing. An interferometer measures the differences in path length of light reflected off the connector endface. Interferometer measurements are accurate to within one wavelength of the light used in measurement. See also: endface, polishing

A device that uses two or more telescopes to observe the same object at the same wavelength and at the same time, thereby achieving high angular resolution by studying the resulting interference.

An instrument that compares or combines radiation from a source that has propagated on two or more paths.

An instrument that uses the principle of interference of electromagnetic waves for purposes of measurement. Used to measure a variety of physical variables, such as displacement (distance), temperature, pressure, and strain.

Measurement device in which a beam of electromagnetic radiation is split and subsequently recombined after travelling different pathlengths so that the beams interfere and produce an interference pattern. This pattern can be used to measure a wide variety of physical parameters.

apparatus employed to detect and measure interference from two or more coherent wave trains from the same source and, in astronomy, to measure the angular width of minute celestial sources and to determine their position on the sky with great accuracy.