LAMOST fiber unit positional precision passive detection exploiting the technique of template matching

摘要

The large sky area multi-object fiber spectroscopic telescope (LAMOST) is an innovative reflecting schmidttelescope, promising a very high spectrum acquiring rate of several ten-thousands of spectra per night. By using theparallel controllable fiber positioning technique, LAMOST makes reconfiguration of fibers accurately according tothe positions of objects in minutes and fine adjusting the fibers. As a key problem, High precision positioningdetection of LAMOST fiber positioning unit has always been highly regarded and some detection schemes havebeen proposed. Among these, active detection method, which determines the final accurate position of optical fiberend with the help of lighting the fiber, has been most widely researched, but this kind of method could not be appliedin LAMOST real-time observation because it needs projecting light into fiber. A novel detection idea exploiting thetechnique of template matching is presented in this paper. As we know, final position of a specific fiber end can beeasily inferred by its corresponding revolving angles of the central revolving axle and bias revolving axle in doublerevolving style, so the key point in this problem is converted to the accurate determination of these revolving angles.Template matching technique are explored to acquire the matching parameters for its real-time collected imagery,and thus determine the corresponding revolving angle of the central revolving axle and bias revolving axlerespectively. Experiments results obtained with data acquired from LAMOST site are used to verify the feasibilityand effectiveness of this novel method.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.