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| Paper: |
Dim Star Astrometry with SIM: The Pathlength Feed-Forward Experiment on the STB-3 Testbed |
| Volume: |
194, Working on the Fringe: Optical and IR Interferometry from Ground and Space |
| Page: |
153 |
| Authors: |
Nemati, B. |
| Abstract: |
Many of the intereseting science targets for SIM astrometry are dim enough that neither the pointing nor the pathlength control necessary for observing fringes can be performed using the usual closed-loop feedback control techniques. The strategy in these cases is to feed "forward" the required control signals using other information so that these loops can be closed. The STB-3 testbed at JPL is designed to develop these technologies for SIM, and is scheduled to demonstrate optical pathlength feed-forward within the next few months. Here we describe the technique used and the status of the experiment. |
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