An intensity interferometer is the name given to devices that use the Hanbury Brown and Twiss effect.[1] In astronomy, the most common use of such an astronomical interferometer is to determine the apparent angular diameter of a radio source or star. If the distance to the object can then be determined by parallax or some other method, the physical diameter of the star can then be inferred. An example of an optical intensity interferometer is the Narrabri Stellar Intensity Interferometer. In quantum optics, some devices which take advantage of correlation and anti-correlation effects in beams of photons might be said to be intensity interferometers, although the term is usually reserved for observatories.
An intensity interferometer is built from two light detectors, typically either radio antenna or optical telescopes with photomultiplier tubes (PMTs), separated by some distance, called the baseline. Both detectors are pointed at the same astronomical source, and intensity measurements are then transmitted to a central correlator facility. A major advantage of intensity interferometers is that only the measured intensity observed by each detector must be sent to the central correlator facility, rather than the amplitude and phase of the signal. The intensity interferometer measures interferometric visibilities like all other astronomical interferometers. These measurements can be used to calculate the diameter and limb darkening coefficients of stars, but with intensity interferometers aperture synthesis images cannot be produced as the visibility phase information is not preserved by an intensity interferometer.
^Fox, Mark (April 28, 2006). Quantum Optics: An Introduction. Oxford University Press. p. 105-108. ISBN 9780191524257.
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An intensityinterferometer is the name given to devices that use the Hanbury Brown and Twiss effect. In astronomy, the most common use of such an astronomical...
will have an intermediate intensity pattern, which can be used to determine their relative phase difference. Most interferometers use light or some other...
The Narrabri Stellar IntensityInterferometer (NSII) was the first astronomical instrument to measure the diameters of a large number of stars at visible...
1954, Robert Hanbury Brown and Richard Q. Twiss introduced the intensityinterferometer concept to radio astronomy for measuring the tiny angular size...
infrared interferometers, such as the Infrared Spatial Interferometer. Some early radio interferometers operated as intensityinterferometers, transmitting...
The Michelson interferometer is a common configuration for optical interferometry and was invented by the 19/20th-century American physicist Albert Abraham...
R. Q. (1958). "Interferometry of the Intensity Fluctuations in Light. IV. A Test of an IntensityInterferometer on Sirius A". Proceedings of the Royal...
spectroscopic measurements. Between 1966 and 1970, the Narrabri Stellar IntensityInterferometer was used to observe the pair and to directly measure the orbital...
the creation of intensityinterferometers. Hanbury Brown was one of the main designers of the Narrabri Stellar IntensityInterferometer and received a...
A Mirau interferometer works on the same basic principle as a Michelson interferometer. The difference between the two is in the physical location of the...
interference intensity is the intensity-keyed signal. Delay line interferometer and Optical DPSK demodulator All-Fiber Delay line interferometer and Optical...
interferometer, Michelson interferometer, and Sagnac interferometer), interference manifests itself as intensity oscillations over time or space, also called...
different interferometer techniques, three are most prevalent: diffraction grating interferometers. vertical scanning or coherence probe interferometers. white...
Velocity interferometer system for any reflector (VISAR) is a time-resolved velocity measurement system that uses laser interferometry to measure the surface...
been suspected from observations made with the Narrabri Stellar IntensityInterferometer in the 1970s. The stellar parallax derived from observations by...
the Hanbury Brown and Twiss effect leading to the creation of intensityinterferometers." Emil Wolf (1922–2018) Louis de Broglie (1892–1987) Richard Quinn...
between two successive reflected or transmitted optical intensity maxima or minima of an interferometer or diffractive optical element. The FSR is not always...
diffraction interferometer (PDI) is a type of common-path interferometer. Unlike an amplitude-splitting interferometer, such as a Michelson interferometer, which...
astronomer and physicist Robert Hanbury Brown, developer of the intensityinterferometer and discoverer of the Hanbury Brown and Twiss effect, was born...
may be used to calculate the spectrum of a source of light, while the intensity autocorrelation and the interferometric autocorrelation are commonly used...
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