Computer Science – Performance
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jkas...25...23h&link_type=abstract
Journal of the Korean Astronomical Society, vol. 25, no. 1, p. 23-46
Computer Science
Performance
Scientific paper
The electrical, mechanical and optical capabilities have been tested of the microdensitometer PDS 1010GMS at the Korea Astronomy Observatory. The highest stage of scan speed 255 csu (conventional speed unit) is measured to be 47 mm/sec. At this speed the position is displaced by 4 micrometer to the direction of scanning and the density is underestimated by 0.4-0.7D. Standard deviation in the measured density is proportional to A^-0.46 where A is the area of scan aperture. The accuracy of position repeatability is +-1 micrometer, and that of density repeatability is +- 0.003-0.03D. Callier coefficient is determined to be 1.37; the semispecular density is directly proportional to the diffuse density up to 3.5D. Because the logarithmic amplifier has a finite response time, the densities measured at high scan speeds are underestimated to the degree that speeds higher than 200 csu are inadequate for making an accurate astronomical photometry. After power is on, an about 5 hour period of warming is required to stabilize the system electrically and mechanically as well. On the basis of this performance test, we have determined the followings as the optimum scan parameters for the astronomical photometry: For the scan aperture 10-20 micrometer is optimal, and for the scan speed 20-50 csu is appropriate. These parameter values are chosen in such a way that they may keep the density repeatability within +- 0.1D, the position displacement under 1 micrometer, and the density underestimation below 0.1D even in high density regions.
Hong Seung Sae
Lee Sang-Gak
Paek W. G.
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