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KMID : 1011420130180040495
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Journal of Korean Ophthalmic Optics Society
2013 Volume.18 No. 4 p.495 ~ p.501
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Study on Golf Range Finder by using Biprism Theory of Keratometer
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Cha Jung-Won
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Abstract
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Purpose:This study was to develop golf range finder which could measure exact distance from golfer to flag by
using telescope and biprism.
Methods:Golf range finder was made that included telescope and biprism which
could move in the telescope, and an accuracy of the range finder was analyzed in distance range 20~200 m.
Results:An equation was made for measuring distance which was related at position of biprism, and we could
measure distance successfully by using developed golf range finder. Biprism of 2 Δ was useful to measure in
short distance but it had bad accuracy in long distance, and 0.5 Δ was more useful in long distance. Image got
worse when the biprism approch to focal point of objective lens for measurement in long distance, so we
developed multi-layer biprism to prevent the weak point.
Conclusions:Image stabilization by biprism for
measuring distance was confirmed. Even if hand was moving, the distance could be measured well by using
biprism, and we could find that the induced equation for distance measurement was useful. We found that multilayer
biprism, which is was new developed, was more useful than general biprism when the biprism approched to
focal point of objective lens for measurement in long distance,
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KEYWORD
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Telescope , Biprism , Multi-layer biprism , Golf range finder
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