intensity interferometer
E295262
An intensity interferometer is a type of astronomical instrument that measures correlations in the intensity of light to determine the angular size and structure of stars with very high precision.
All labels observed (1)
| Label | Occurrences |
|---|---|
| intensity interferometer canonical | 1 |
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical instrument
ⓘ
intensity interferometer ⓘ interferometer ⓘ observational astronomy technique ⓘ |
| advantage |
can operate at short optical wavelengths
ⓘ
can use long baselines ⓘ insensitivity to atmospheric phase fluctuations ⓘ |
| basedOn |
Hanbury Brown and Twiss effect
ⓘ
surface form:
Hanbury Brown–Twiss effect
|
| comparedTo |
Michelson interferometer
ⓘ
surface form:
Michelson stellar interferometer
|
| developedBy |
Richard Q. Twiss
ⓘ
Robert Hanbury Brown ⓘ |
| doesNotRequire |
optical beam combination
ⓘ
optical path phase stability ⓘ |
| fieldOfUse |
astronomy
ⓘ
astrophysics ⓘ stellar astronomy ⓘ |
| historicalPeriod | mid-20th century ⓘ |
| influenced |
development of quantum optics experiments
ⓘ
photon correlation techniques in astronomy ⓘ |
| limitation |
limited imaging capability compared to amplitude interferometers
ⓘ
low signal-to-noise for faint stars ⓘ requires bright sources ⓘ |
| locatedIn | Australia ⓘ |
| measures |
angular diameter of stars
ⓘ
intensity correlations of light ⓘ second-order coherence of light ⓘ stellar angular size ⓘ stellar structure ⓘ |
| notableImplementation | Narrabri Stellar Intensity Interferometer ⓘ |
| observables | degree of second-order coherence g2 ⓘ |
| operatedBy | University of Sydney ⓘ |
| operatesAt |
optical wavelengths
ⓘ
visible light ⓘ |
| relatedTo | amplitude interferometer ⓘ |
| requires |
correlator electronics
ⓘ
high time-resolution detectors ⓘ |
| resolutionDeterminedBy |
baseline length between telescopes
ⓘ
observing wavelength ⓘ |
| theoreticalBasis |
quantum optics
ⓘ
statistical optics ⓘ |
| usedFor |
measuring effective temperatures of stars
ⓘ
measuring stellar diameters ⓘ testing stellar atmosphere models ⓘ |
| uses |
correlation of intensity fluctuations
ⓘ
electronic signal correlation ⓘ photon bunching ⓘ separated telescopes ⓘ |
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.