Segmented mirrors will be used in the telescopes of the Pierre Auger Fluorescence detector. To align the segments, we have developed four methods in which (a) the image of the stop border, (b) the image of a screen with concentric circles, and (c) the Ronchi pattern are used. In addition to these, we have developed a new method, (d), in which instead of the Ronchi ruling, we have used a circular grid. In this case we obtain a moiré pattern for each segment by means of which the experimental setup is simplified, and the sensitivity of the alignment is improved.
© 2000 Optical Society of America
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure
(220.1140) Optical design and fabrication : Alignment
(220.4840) Optical design and fabrication : Testing
Alberto Cordero-Dávila, Juan Manuel Nũez-Alfonso, Jorge Castro-Ramos, and Maria Elizabeth Percino-Zacarias, "Optical Alignment of Segmented Mirrors to the Fluorescence Detectors of the Pierre Auger Observatory," Appl. Opt. 39, 3295-3299 (2000)