Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jbaa...97...30w&link_type=abstract
Journal of the British Astronomical Association, vol.97, no.1, p.30-33
Astronomy and Astrophysics
Astronomy
3
Scientific paper
The development of a new type of photometer is described. Novel features include interfacing the photometer to the telescope by either a fluid light guide or a fibre optic, and photon counting in the photometer itself to allow control and online reduction by cheap microprocessors. The second feature allows extra channels to be added later, thus providing the basis for the comparative photometer that is needed for accurate photometry in poor climates. Interfacing the telescope to the photometer by a fluid light guide has the twin benefits of keeping most of the weight off the telescope and leaving the photometer (and its ancillary electronics) stationary and hence subject to less mechanical stress. Results of tests on one of the devices by French amateur Claude Gregory are presented and show a standard error on the mean of ten measurements obtained over three hours of +/-0.0018 magnitudes.
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