Results from a pinhole spatial filtering system at COAST

Details Results from a pinhole spatial filtering system at COAST Results from a pinhole spatial filtering system at COAST

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4838..266k&link_type=abstract

Interferometry for Optical Astronomy II. Edited by Wesley A. Traub. Proceedings of the SPIE, Volume 4838, pp. 266-272 (2003).

Astronomy and Astrophysics

Astronomy

Scientific paper

We present details of the design and construction of a new pinhole Spatial Filtering system at the Cambridge Optical Aperture Synthesis Telescope and show the results from the first astronomical observations with the system. We discuss the advantages of using such a system to reduce uncertainties in visibility observations with an optical/IR interferometer. We compare simultaneous observations with and without the system and show the potential to improve both the quality and quantity of scientific output of an interferometer. We also show that filtered observations are much more robust to changes in atmospheric seeing than unfiltered observations, improving the accuracy of calibrated visibility measurements while reducing the need for repeated calibration. Given the simplicity and high throughput of pinhole spatial filters we suggest that they could be a valuable addition to many current and future arrays.

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