Apparatus to measure the correlation between two wideband (10 to 100 MHz) noise signals has been developed for the stellar intensity interferometer at the Narrabri, NSW, Australia, observatory. This instrument is used to measure the angular diameters of stars in the range 0. 01 to 0. 0001 sec of arc, with an accuracy within about 5%. To achieve this precision with the low snr of an intensity interferometer, it is necessary to integrate and average the data for periods up to 100 hr, which may involve observations spread over several weeks. The paper describes the novel techniques which have been used to obtain the necessary efficiency and stability in the electronic correlator. Paper 6212E.
|Number of pages||6|
|Journal||Proceedings of the Institution of Electrical Engineers|
|Publication status||Published - Aug 1970|