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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 calculate indices of refraction.

in′ter·fer′o·met′ric (-fîr′ə-mĕt′rĭk) adj.
in′ter·fer′o·met′ri·cal·ly adv.
in′ter·fe·rom′e·try n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


1. (General Physics) physics any acoustic, optical, or microwave instrument that uses interference patterns or fringes to make accurate measurements of wavelength, wave velocity, distance, etc
2. (Astronomy) astronomy a radio or optical array consisting of two or more telescopes separated by a known distance and connected so that the radiation from a source in space undergoes interference, enabling the source to be imaged or the position of the source to be accurately determined
interferometric adj
ˌinterˌferoˈmetrically adv
ˌinterferˈometry n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌɪn tər fəˈrɒm ɪ tər)

1. a device that splits light into two or more beams, usu. by reflection, and then brings them together to produce interference, used to measure wavelength, index of refraction, and astronomical distances.
2. an optical instrument for measuring the angular separation of double stars or the diameter of giant stars by means of the interference phenomena of light they emit.
in`ter•fer`o•met′ric (-ˌfɪər əˈmɛ trɪk) adj.
in`ter•fer`o•met′ri•cal•ly, adv.
in`ter•fer•om′e•try, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.


an instrument that measures wavelengths, minute distances, or the refractivity of lenses by comparison of interference patterns generated by the splitting and reuniting of a beam of light passed through a lens. — interferometry, n.
See also: Instruments
-Ologies & -Isms. Copyright 2008 The Gale Group, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.interferometer - any measuring instrument that uses interference patterns to make accurate measurements of waves
measuring device, measuring instrument, measuring system - instrument that shows the extent or amount or quantity or degree of something
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
In addition, Jenoptik's camera lenses are being used in Nasa's Mars 2020 mission, while iXblue's optical phase modulators have been integrated into the laser ranging interferometer of the Nasa GRACE-FO climate research mission.
Larson also works in gravitational wave astronomy with the ground-based Laser Interferometer Gravitational-Wave Observatory and the space-based Laser Interferometer Space Antenna project.
One method of capturing x-ray phase data is the implementation of a grating interferometer in the x-ray path.
Hanbury Brown's] intensity interferometer is a considerable advance over the Michelson phase interferometer [used] at Mount Wilson in the 1920's....
In this paper, we propose an interferometric seismometer that is based on a heterodyne laser interferometer and analyze seismic data in the frequency range to estimate epicenter location.
Set-ups for calibrating high-precision line scales normally involve a microscope with an optical sensor for capturing and analysing the image of a line marker and a laser interferometer as a traceable measurement standard [5-7].
The measurement setup used optical fiber Michelson interferometer and sophisticated signal processing to extract the useful data, where the used optical fiber was spirally twisted and built in a bed mattress.
The Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) in the US detected the ripple coming from the collision--a gravitational wave.
According to Dunn, when this technology is used with Doppler radar, it "could prove very useful as an early warning system." The ring laser interferometer could similarly be used to detect infrasound from hurricanes and volcanoes, and Dunn noted that the research team plans to "continue exploring how ring lasers can help reduce the impact of natural hazards."
AE measurement with interferometer type sensors is performed by paying attention to the change of the light intensity so that only the light source and the optical detector are required to construct the monitoring system, while the sensors based on other principles sometimes need equipment to examine wavelength shift, traveling time of the light, etc.
The latest addition to the Verifire line of laser-interferometer and optical-testing products is configured with key capabilities that establish a robust, high-quality, and flexible laser interferometer with a low cost of ownership.