Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...272..378d&link_type=abstract
Astronomy and Astrophysics, Vol. 272, p. 378 (1993)
Astronomy and Astrophysics
Astrophysics
1
Instruments, Data Analysis
Scientific paper
A description of an electronic device for solar Doppler velocity measurements based on a TV dissector- tube is given. As to the principle of measurements, this instrument is the electronic analog of the magnetograph Doppler compensator. The advantages of this device over existing Doppler compensators using a tilting glass plate are the absence of moving parts, the flexibility of the scan parameters, and the high speed. The instrument provides quasi-simultaneous measurements of (a) the shifts of two neighbouring spectral lines, (b) the shifts in a single spectral line at two intensity levels (nearer to the core and the wings), and (c) the spectral line shifts at two points spaced along spectrum height.
The non-uniformity of the photocathode sensitivity must be regarded as the disadvantage of the device. The functional principles of this instrument are described, and some specific errors of measurements are considered. We discuss the influence of: (a) the non-uniformity of photocathode sensitivity, (b) spectral-line inclination in the spectrum, (c) the illumination non-uniformity of the spectrograph entrance slit, and (d) interference and stray light.
Druzhinin S. A.
Pevtsov Alexander
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