Physics – Optics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996optco.132..503k&link_type=abstract
Optics Communications, Volume 132, Issue 5-6, p. 503-510.
Physics
Optics
1
Scientific paper
Using the spectral interference law [Phys. Lett. A 157 (1991) 6], the degree of spectral coherence μ12(ω) between the two sources formed over the planes of the light collecting mirrors of a laboratory version of Michelson's stellar interferometer is determined from the measurement of the spectral changes produced on superimposition of radiation from these two sources. The theoretically expected values of μ12(ω) using the experimental parameters in the van Cittert-Zernike theorem agree well with the experimentally calculated values of μ12(ω) within experimental errors. A new interferometric equivalence principle [Radio Sci. 26 (1991) 1239] is used to determine the angular size of the source from the zeros of μ12(ω) in the frequency scale. This new technique makes the determination of the angular size of a source less time consuming and simpler than the conventional methods.
Joshi K. C.
Kandpal Hem Chandra
Vaishya J. S.
Wasan Ajay
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