High-precision calibration of interferometric data through the removal of fixed-pattern residuals

Christopher Tycner; J. A. Benson; D. J. Hutter; H. R. Schmitt; R. T. Zavala

doi:10.1117/12.672043

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29 June 2006 High-precision calibration of interferometric data through the removal of fixed-pattern residuals

Christopher Tycner, J. A. Benson, D. J. Hutter, H. R. Schmitt, R. T. Zavala

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Proceedings Volume 6268, Advances in Stellar Interferometry; 626849 (2006) https://doi.org/10.1117/12.672043
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

We demonstrate a new calibration technique that can be applied to multi-spectral interferometric observations. The technique measures a fixed-pattern in squared visibility measurements across the spectral channels of each baseline. Because the fixed-pattern appears to be stable on time scales longer than one night, nightly or weekly averages can be calculated based on observations of calibrator stars. The averaged fixed-pattern values can then be removed from data of target stars. We demonstrate the performance of the calibration technique on actual observations obtained with the Navy Prototype Optical Interferometer and show that the fixed-pattern effects can be suppressed by up to an order of magnitude.

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Christopher Tycner, J. A. Benson, D. J. Hutter, H. R. Schmitt, and R. T. Zavala "High-precision calibration of interferometric data through the removal of fixed-pattern residuals", Proc. SPIE 6268, Advances in Stellar Interferometry, 626849 (29 June 2006); https://doi.org/10.1117/12.672043

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