Metrology optical power budgeting in SIM using statistical analysis techniques

Gary M. Kuan

doi:10.1117/12.790459

28 July 2008 Metrology optical power budgeting in SIM using statistical analysis techniques

Gary M. Kuan

Proceedings Volume 7013, Optical and Infrared Interferometry; 70134V (2008) https://doi.org/10.1117/12.790459
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

The Space Interferometry Mission (SIM) is a space-based stellar interferometry instrument, consisting of up to three interferometers, which will be capable of micro-arc second resolution. Alignment knowledge of the three interferometer baselines requires a three-dimensional, 14-leg truss with each leg being monitored by an external metrology gauge. In addition, each of the three interferometers requires an internal metrology gauge to monitor the optical path length differences between the two sides. Both external and internal metrology gauges are interferometry based, operating at a wavelength of 1319 nanometers. Each gauge has fiber inputs delivering measurement and local oscillator (LO) power, split into probe-LO and reference-LO beam pairs. These beams experience power loss due to a variety of mechanisms including, but not restricted to, design efficiency, material attenuation, element misalignment, diffraction, and coupling efficiency. Since the attenuation due to these sources may degrade over time, an accounting of the range of expected attenuation is needed so an optical power margin can be book kept. A method of statistical optical power analysis and budgeting, based on a technique developed for deep space RF telecommunications, is described in this paper and provides a numerical confidence level for having sufficient optical power relative to mission metrology performance requirements.

Citation Download Citation

Gary M. Kuan "Metrology optical power budgeting in SIM using statistical analysis techniques", Proc. SPIE 7013, Optical and Infrared Interferometry, 70134V (28 July 2008); https://doi.org/10.1117/12.790459

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