Demonstration and performances of real-time fringe tracking: A step towards cophased interferometers

Details Demonstration and performances of real-time fringe tracking: A step towards cophased interferometers Demonstration and performances of real-time fringe tracking: A step towards cophased interferometers

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.344..277d&link_type=abstract

In ESA, Solar Physics and Astrophysics at Interferometric Resolution p 277-282 (SEE N93-10901 01-90)

Astronomy and Astrophysics

Astronomy

Correlators, Delay Lines, Diffraction Patterns, Interferometry, Real Time Operation, Requirements, Algorithms, Data Acquisition, Fine Structure, Metrology, Optical Paths, Spaceborne Astronomy

Scientific paper

Imaging of complex and extended objects by the Solar Ultraviolet Network (SUN) requires a real time monitoring of the coalignment and cophasing functions of the interferometer. The cophasing of the input beams, i.e., the equalization (zeroing) of the optical path delays, is specific to interferometry and is required to high precision if diffraction limited imaging with the interferometer is expected (wavelength/8 or so at the shortest wavelength). Preliminary results in fringe pattern acquisition and stabilization as performed in a Mach-Zehnder set up representative of the interferometer cophasing system are reported. The system algorithm is based on 'white light' fringe tracking controlled in a reference interferometer by a synchronous detection. This servosystem drives a two stage delay line for real time compensation of the optical path delays. Acquisition capacities and stability possibilities are investigated as a function of flux and noise levels.

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