Development of a line-scan CCD-based fringe tracker for optical interferometry
Traditional high-precision optical techniques, such as interferometry, are in ever-greater demand for non controlled environments. This is the case for the UPC-ZEBRA, a large-aperture interferometer that was built to measure vertical discontinuities (i.e., piston errors)in segmented mirrors. The large mechanical systems used to drive the interferometer to the different measurement positions generate perturbations that are highly incompatible with the expected piston measurements on the nanometer scale. We introduce anew system based on a line-scan CCD to track interference fringes. The error signal obtained from this fringe tracker has been used in a closed-loop control system to actively stabilize the interferometer. The perturbation has been attenuated by a factor of 1/200.
- OSTI ID:
- 20853565
- Journal Information:
- Applied Optics, Vol. 45, Issue 26; Other Information: DOI: 10.1364/AO.45.006694; (c) 2006 Optical Society of America; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6935
- Country of Publication:
- United States
- Language:
- English
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