Shot noise limits to sensitivity of optical interferometry

Details Shot noise limits to sensitivity of optical interferometry Shot noise limits to sensitivity of optical interferometry

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3066...93p&link_type=abstract

In its A Lunar Optical-Ultraviolet-Infrared Synthesis Array (LOUISA) p 93-107 (SEE N93-13579 03-89)

Physics

Beam Splitters, Interferometers, Interferometry, Photoelectrons, Shot Noise, Signal To Noise Ratios, Inference, Optical Measuring Instruments, Sensitivity, Synthetic Arrays, Visibility

Scientific paper

By arguing that the limiting noise is the photoelectron shot noise, we show that the sensitivity of image synthesis by an ideal optical interferometer is independent of the details of beam-splitting and recombination. The signal-to-noise ratio of the synthesized image is proportional to the square root of the total number of photoelectrons detected by the entire array. For non-ideal interferometers, which are forced to employ a closure-phase method of indirect inference of the visibility data, essentially the same result holds for strong sources, but at weak light levels beam-splitting degrades sensitivity.

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