NICI Fiber Optic Calibration Source
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The NICI Fiber Optic Calibration Source (FOCS) is a four-position translator mounted at the beam entrance focus of the AO relay. It provides an internal reference sourcefor AO calibration (single-mode fibre) and a pinhole grid for mapping the distortion of thetwo science detectors.
| NICI Fiber Optic Calibration Source | ||
| Position | Description | Gemini ID |
| 1 | One fiber in the field center for system tests and AO calibration. Also acts as dust cover to AO relay. | -- |
| 2 | 40 x 40 grid of 130 µm pinholes for distortion and registration mapping. | G... |
| 3 | Two fibers in opposite corners of the field. Can be inserted while taking a science image to track the registration of the two arrays. | -- |
| 4 | Open. | -- |
