Other
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975s%26w....14..248s&link_type=abstract
Sterne und Weltraum, vol. 14, July-Aug. 1975, p. 248-250. In German.
Other
Electrophotometry, Focusing, Numerical Control, Optimal Control, Stellar Spectrophotometry, Variable Stars, Astronomical Photometry, Block Diagrams, Digital Techniques, Measuring Instruments, Reference Stars, Step Functions
Scientific paper
It is pointed out that focusing accuracy requirements in the case of an employment of photocells in the photometry of variables make it necessary to use stepping motors in place of synchronous motors. The guiding and focusing procedure for the telescope involves operations in three control ranges which are independent from each other. The requirements for an optimal stellar focusing technique are discussed, taking into account the design details of a specific instrument which had been built for the photometric study of variables.
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