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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.


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


(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.


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
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
References in periodicals archive ?
GeoSAR is a one-of-a-kind airborne radar mapping system that collects dual-band interferometric synthetic aperture radar (IFSAR) data through clouds and dense foliage over large project areas.
Contract award notice: Framework agreement for ground-based radar interferometry detection service for landslide monitoring, Hydrogeological and other geological phenomena - territorial monitoring activities for civil protection purposes with advanced gb-insar products and services - advanced ground techniques -based interferometric synthetic radar apertures, For remote and continuous deformation of the earth~s deformations for the activities of the earth sciences department - 800 000 eur.
Thus, one method to obtain a 3-D color image is to do a two-scan measurement: one scan with an interferometric objective delivering 3-D measurement data based on finding a best focus position for each pixel, and a second scan with a bright-field objective during which imaging information is collected only at the previously predetermined best-focus positions and then overlaid on the 3-D measurement data.
The topics include analogue performance metrics, sources of noise in fiber optic links, propagation effects, external intensity modulation with direct detection, external phase modulation with interferometric detection, other analog optical modulation methods, and high current photodetectors.
The general themes are an overview of radiointerferometers, geostationary satellite orbits, and interferometric tracking.
In [12], both coherent and incoherent interferometric SAR images of a moving train obtained by ground stationary two-channel Ku-band radar system were presented.
A team using the CHARA Array on Mount Wilson in California has constructed interferometric images of the face of the giant, F-type star.
The trend to direct-write holograms was launched by US company International Holographic Paper's development of the iScan interferometric scanning system in late 1999, as reported in the December '99 issue of Holography News.
Now in its second edition, this manual on tunable lasers has been expanded to include recent developments over the last decade such as optical parametric oscillators, solid-state dye lasers, interferometric imaging and large free-electron lasers.
To combine the quantitative results from light microscopy with the speed of the surface roughness techniques, the method of interferometric microscopy (IFM) has been applied to carbon black dispersion characterization in vulcanized elastomeric systems by Columbian Chemicals (ref.
In the following section, we describe an interferometric experiment that measures the phase shift
That may prove especially helpful as astronomy moves beyond individual telescopes like Hubble to interferometric telescopes and other detectors, Lloyd says.