Computer Science – Sound
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..627...39r&link_type=abstract
IN: Instrumentation in astronomy VI; Proceedings of the Meeting, Tucson, AZ, Mar. 4-8, 1986. Part 1 (A87-36376 15-35). Bellingha
Computer Science
Sound
3
Drift (Instrumentation), Etalons, Helioseismology, Solar Instruments, Fabrication, Solar Interior, Sound Waves, Stellar Interiors, Thermal Stability, Tunable Lasers
Scientific paper
A solid etalon has been designed and fabricated from a 50-mm diameter wafer of optical-quality lithium niobate. The finished etalon has a free spectral range of 0.325 nm at 588 nm. The parallel faces are coated with silver, and the central 15-mm aperture of the etalon has a finesse of 18.6. The reflective faces double as electrodes, and application of voltage will shift the passband. This feature was used in a servo circuit to stabilize the passband against temperature and tilt-induced drifts to better than three parts in one billion. Operated in the stabilized mode for day-long sessions, this filter alternately samples the wings of a narrow atomic absorption line in the solar spectrum and produces a signal proportional to velocity on the solar disk. The Fourier transform of this signal yields information on acoustic waves in the solar interior.
Burton Clive H.
Leistner Achim J.
Rust David Maurice
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