Measurement system of the refractive power of spherical and sphero-cylindrical lenses with the magnification ellipse fitting method

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This paper proposes a new measurement system for measuring the refractive power of spherical and sphero-cylindrical lenses with a six-point light source, which is composed of a light en-fitting diode and a six-hole pattern aperture, and magnification ellipse fitting method. The position of the six light sources is changed into a circular or elliptical form subjected to the lens refractive power and meridian rotation angle. The magnification ellipse fitting method calculates the lens refractive power based on the ellipse equation with magnifications that are the ratios between initial diagonal lengths and measured diagonal lengths of the conjugated light sources changed by the target lens. The refractive powers of the spherical and sphero-cylindrical lenses certified in the Korea Research Institute of Standard and Science were measured to verify the measurement performance. The proposed method is estimated to have a repeatability of +/- 0.01D and an error value below 1%. (C) 2009 American Institute of Physics. [doi:10.1063/1.3262503]
Publisher
AMER INST PHYSICS, CIRCULATION & FULFILLMENT DIV
Issue Date
2009-11
Language
English
Article Type
Article
Keywords

PREVALENCE

Citation

REVIEW OF SCIENTIFIC INSTRUMENTS, v.80, no.11

ISSN
0034-6748
DOI
10.1063/1.3262503
URI
http://hdl.handle.net/10203/96881
Appears in Collection
ME-Journal Papers(저널논문)
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