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SIM PlanetQuest white-light fringe modeling: picometer accuracy calibration and estimation algorithms.

Chengxing Zhai¹, Jeffrey Yu, Mike Shao

¹Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA. Chengxing.Zhai@jpl.nasa.gov

|February 12, 2009

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Scientists developed a new method for calibrating white-light fringes in astrometry, crucial for precise space telescope measurements. This technique improves accuracy to better than 20 picometers, meeting a key engineering milestone.

Area of Science:

Astronomy and Astrophysics
Optical Interferometry
Precision Measurement

Background:

SIM PlanetQuest requires microarcsecond astrometry accuracy, necessitating picometer-level optical path difference measurements.
Accurate modeling and calibration of white-light fringes are critical challenges for starlight interferometry.
Previous CCD-pixel-level calibration schemes are inadequate due to wavefront aberrations causing significant phase-dispersion variations.

Purpose of the Study:

To develop an improved white-light fringe model accounting for wavefront aberrations.
To create a robust calibration and estimation scheme for resolving pixel bandwidth.
To validate the new method using simulated and experimental data.

Main Methods:

Developed a white-light fringe model incorporating extra phase dispersions from wavefront aberrations.

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Implemented a calibration and estimation scheme utilizing long-stroke fringe measurements.

Validated the algorithm with simulated data and experimental data from the Spectral Calibration Development Unit (SCDU).

Main Results:

Simulated data showed total systematic errors in the calibration and estimation scheme below 1 picometer.
Experimental data from SCDU demonstrated an end-to-end accuracy better than 20 picometers.
Achieved SIM PlanetQuest Engineering Milestone 4, validating the algorithm's performance.

Conclusions:

The novel white-light fringe model and calibration scheme effectively address challenges posed by wavefront aberrations.
The developed method provides picometer-level accuracy, essential for future high-precision astrometry missions.
The successful validation confirms the algorithm's readiness for SIM PlanetQuest.